Sony Alpha Blog

Kase 150mm F5.6 AF

Published by

Marc Alhadeff

on

Close-up of a Sony Alpha 7R camera with a large lens attached, showcasing the brand logo and lens details.

in Blue English / en noir en Français

Table of Contents / Table des matières hide
1 Presentation
1.1 Introduction
1.2 Specifications
1.2 AF Performances / Performances AF
2 Optical performances / Performances optiques
2.1 Sharpness / Piqué
2.2 Vignetting / chromatic aberrations / distortion / flare
2.2 Vignettage / aberrations chromatiques / distorsion / flare
2.3 Bokeh / Color Rendition – Bokeh / Rendu des Couleurs
3 Video
4 Comparaison with a classical low budget zoom 70-300
5 Samples of Photos / Exemples de Photos
6 Conclusion (English)
5 Conclusion (Français)
Like this:

All photos , taken with Sony A7RV are available in full size (61Mpix) in the following Flickr album suivant : Kase 150mm F5.6

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Toutes les photos de l’article, prises avec le Sony A7RV sont disponibles en pleine résolution (61Mpix) dans l’album flickr suivant : Kase 150mm F5.6

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1 Presentation

1.1 Introduction

The Reflex lens are special lens using the reflection of a mirror to achieve cheap , small and light telephoto lens. Those lenses shave a fixed aperture quite low in general F8 and are often not very sharp or contrasty , have a bokeh with a a doughnut shape due to the internal mirror, so they better be used on a low level MPix camera for people looking a a low budget telephoto lens

Diagram illustrating the light path in a camera system featuring a main mirror, secondary mirror, correction element, and sensor.

Les Optiques Reflex dites à Miroir ont une conception particulière et utilise un miroir pour atteindre une taille très compacte , un poids plume pour des optiques à longue focale (400-800mm) à des prix très raisonnables (<400 euros). Ces optiques on une ouverture fixe assez faible (F8 en général) ne sont pas très piquées ni très contrastées et présentent un bokeh en forme de doughnut (rond percé) du à la présence du miroir. On ne l’utilisera donc que en cas de budget très serré et sur capteurs faiblement pixellisés

1.2 Specifications

In general Reflex lenses target very long telephoto like 400 to 800mm and F8 to F11 aperture so they are difficult to use as very long and needing a tripod. Kase has chosen to propose something more usable with a 150mm “only” lens and an aperture of F5.6 which still allow for some background blur

The lens is quite small but not very light. the build quality is very good. The lens is equipped with AF which is very rare for such lens , it has also a AF/MF button and the focusing ring is well dampened allowing for precise focusing

Unfortunately the minimum focusing distance is very long at 150mm

Min shutter of 1/200 sec min and F5.6 will make ISO climbs quite quickly

The lens hood is a traditional one

Focal
Focale		150mm
Aperture /
Ouverture		F5.6
Weight / Poids500g
Length / Taille105mm
Price / Prix650$ / 800 euros
Min focusing
distance
Distance mini
de mise au
point		150cm
Aperture bladeN/A
Filter size67mm
ButtonsAF/MF
USBC port for firmware upgrade
magnetic lens cap
Close-up of a Kase Reflex 150 mm f/5.6 autofocus camera lens on a white background.
A Kase REFLEX 150 mm f/5.6 AF camera lens with a smooth black finish and a focus mode switch.
A close-up of a Kase camera lens, featuring a black finish and millimeter markings, positioned against a white background.
Close-up view of a camera lens with a magnetic inlaid ring, labeled 'Kase MAGNETIC INLAID RING 67mm FJ23 PLUS'.

En général les optiques à miroir visent des focales démesurées de 400 à 800mm avec des ouvertures très petites de F8 à F11 et sont difficiles à utiliser en pratique. Kase à choisi de ne pas exagérer et de proposer une focale beaucoup plus raisonnable de 150mm avec une ouverture de F5.6 qui permet encore d’avoir un flou d’arrière plan convenable

L’optique est assez compacte mais pas très légère. La qualité de construction est très bonne. L’optique dispose d’un autofocus ce qui est très rare sur ce genre d’optique. Il y a aussi un bouton AF/MF

Malheureusement la distance min de mise au point est très longue à 150cm au lieu de 80-100cm pour une optique traditionnelle

Le pare soleil est classique

Une vitesse min de 1/200s devra être utilisé avec ce genre d’objectif donc des iso assez élevés avec une ouverture de F5.6

A Sony Alpha 7R camera with a large lens, showcasing a sleek, professional design.
Sony Alpha 7R camera with a large lens attached, viewed from the side against a plain background.

1.2 AF Performances / Performances AF

The AF is quite slow , but it is efficient, In burst mode results are quite good

L’Af est assez lent et précis, en rafale c’est assez bon

An elderly man with gray hair rides a bicycle through a city street, carrying bags in a basket on the back.
An elderly person with gray hair rides a bicycle in a city street, carrying containers in a basket. A pedestrian and a food delivery rider are visible in the background.
A person with gray hair riding a bicycle in a city setting, with another individual in a blue jacket standing next to a scooter and holding shopping bags.
A busy urban scene showing a cyclist riding past two pedestrians, with escalators in the background. A banner advertising lunch specials is visible.
A person riding an electric bicycle in an urban area, wearing a hoodie and holding a phone, with construction barriers and a partially paved road in the background.
A person riding an electric bike while using a smartphone, wearing a hooded jacket and black pants.
A person in a hooded jacket riding an electric bicycle while using a smartphone. The background features a paved area with benches and a recycling bin.
A person wearing a dark jacket and blue beanie rides a bicycle in an urban area.
A busy urban street scene featuring a cyclist on a bike with a teal bag, riding through a crosswalk. Pedestrians are walking on either side, including a person in a brown jacket and another in purple pants. The street is wet, indicating recent rain.
A cyclist wearing a dark jacket and carrying a teal bag rides on a wet city street while a woman in a brown jacket and pink pants runs towards the camera. Pedestrians are seen in the background walking along the sidewalk.
A cyclist wearing a hooded jacket rides a bicycle on a wet street, carrying a teal bag on the bike. In the background, people walk along the sidewalk amidst urban surroundings.
A cyclist wearing a hoodie rides through a busy urban street in wet weather, surrounded by pedestrians and city buildings.
A man riding a bicycle on a city street, wearing a hooded jacket and carrying a teal delivery bag.
A man riding a bicycle on a busy street, wearing a hooded jacket, with a turquoise delivery bag attached to the bike.

2 Optical performances / Performances optiques

2.1 Sharpness / Piqué

  • The tests were made on a Sony A7RIV with its 61 Mpix
  • The results are average to good in ideal conditions on the entire field
  • Les tests on été effectués sur un A7RIV avec ses 61Mpix
  • Les résultats sont moyens à bons max sur tout le champ en conditions idéales
A bookshelf filled with various cookbooks in different languages, featuring titles on cuisine, barbecuing, and healthy eating, alongside a 20 euro banknote placed on one of the shelves.
Spines of various cookbooks lined up, featuring text in different colors including the word 'LEGUMES' in blue.
A bookshelf filled with various cookbooks and literature, showcasing a mix of colorful spines and titles in different languages.
Close-up of two black book spines featuring circular logos; the left spine has a smudge, and the right spine displays a clear logo with a 'G' inside a circle.

Real life samples / Exemple en situation

In real life ISO vary between 800 and 6400 ISO, in bright light conditions you can keep it at 100 ISO. Results are good on A7RV but will be better on lower Mpix sensor of 24/33Mpix

Dans les situations réelles , les ISO varient entre 800 et 6400 ISO, dans des conditions très lumineuses on peut se maintenir à 100 ISO. Les résultats sont bons sur A7RV mais seront meilleurs sur des capteurs de 24/33Mpix

Close-up view of a modern high-rise building featuring a round glass structure and angular elements, showcasing a mixture of reflective windows and metal finishes.
Close-up of a modern building facade with a combination of glass and metallic elements.
Close-up of an ornate building with a golden dome topped by a figure, featuring statues and detailed architecture against a cloudy sky.
Close-up of a decorative rooftop with golden accents and a spherical finial.
A busy square in Brussels featuring ornate historic buildings with gold accents and large windows, bustling with tourists.
Close-up of an ornate architectural detail featuring a red panel with the letters 'AN' in gold, surrounded by intricate golden decorations.
A woman with curly hair wearing a grey beanie and scarf, looking at the camera with a neutral expression. The background is blurred with colorful lights and people.
Close-up of a human eye, showcasing green hues in the iris and fine details of eyelashes and skin texture.
A smiling man wearing a black jacket with white speckles, standing in a blurred indoor setting filled with people.
Close-up image of a human eye with detailed iris and skin texture.

2.2 Vignetting / chromatic aberrations / distortion / flare

  • Distortion is null
  • Vignetting is low
  • Chromatic aberrations are not present
  • Resistance to flare is bad

2.2 Vignettage / aberrations chromatiques / distorsion / flare

  • La distorsion est nulle
  • Le vignettage est faible
  • Les aberrations chromatiques sont quasi nulles
  • La résistance au flare est mauvaise
A close-up of a shelf filled with various cookbooks, including titles in French, accompanied by a €20 note placed on the shelf.
Close-up view of a modern building with a partially cloudy sky in the background and light flares creating a soft focus effect.
A sunlit plant silhouetted against a bright sun, with lens flare and soft focus effects.
A close-up view of green leaves with sunlight shining through, creating a blurred, dreamy effect and circular light patterns.
A blurred image of green leaves with reflections and soft bokeh effects in the background.

2.3 Bokeh  / Color Rendition – Bokeh / Rendu des Couleurs

  • The Bokeh balls are typical of a mirror lens with doughnut
  • The background blur is quite nervous
  • The colour rendition is better than the average reflex lens with good colours and contrast but still below traditional lenses
  • Les ronds de Bokeh sont typique d’une optique à miroir en forme de doughnut
  • Le flou d’arrière plan est relativement nerveux
  • Le rendu des couleurs est meilleur que la moyenne des optiques à miroir avec des bonnes couleurs et un bon contraste mais qui restent en dessous des optiques traditionnelles
A Playmobil figure standing on a camera lens, with colorful bokeh circles in the background creating a dreamy effect.
An abstract image featuring blurred circular shapes in various colors, primarily soft whites and greens, creating a dreamy effect.
An abstract image featuring blurred shapes and soft colors, primarily yellow and blue, creating a dreamy, out-of-focus effect.
Blurred image of the Olympic rings with colorful light reflections in the background.
A close-up view of a yellow bicycle's rear end and wheel, with a motion blur effect emphasizing movement.
Close-up view of a wet black railing with blurred background, suggesting a rainy or misty day.
Three wooden fence posts topped with pointed ends, bound by wire, set against a blurred green background.
Close-up view of lush green ivy leaves with a variety of shapes and textures.
A vibrant display of colorful bath products in a shop, featuring various shapes and sizes of soaps with price tags, including items like 'Peach Crumble' and 'Unicorn Horn'.
A display of bright pink, glittery bath products shaped like jelly molds arranged on a white platter with colorful packaging in the background.
A variety of waffle treats displayed in white boxes with colorful accents, featuring toppings like bananas, strawberries, and chocolate drizzle.
Close-up of colorful striped pavement featuring green, blue, purple, yellow, and white lines.

3 Video

Video results are good, correct contrast & good colors (but a bit dull sometimes), good sharpness, efficient AF. Focus breathing is quite visible

Les résultats en vidéo sont bons. : piqué bon , couleurs bonnes bien qu’un peu fade et manquant de contraste parfois. AF efficcace. Le focus breathing est assez visible

A colorful Playmobil figurine standing on top of a camera lens, with a blurred background of bookshelves.
A close-up view of a bookshelf filled with various cookbooks and literature, including a prominent orange and white cookbook, a 20 euro note placed on a shelf.

4 Comparaison with a classical low budget zoom 70-300

NiSi has also a 250mm F5.6 reflex but it is not available for testing

There is another 200mm F5.6 from Kase but without AF, but in the traditional lens a Tamron 70-300mm F4.5-6.3 Di RXD is a bit cheaper and also offer F5.6 at 200mm

NiSi a aussi une optique reflex , un 250mm F5.6 mais qui n’est disponible pour un test. Kase a une autre optique reflex un Kase 200mm f5.6 manuel

A part cela il n’ya pas d’autres optiques reflex de cette longueur focale, mais en optique traditionnelle le Tamron 70-300mm F4.5-6.3 Di RXD offre aussi une ouverture de F5.6 est est moins cher que le Kase

Kase 150mm F5.6 Kase 200mm F5.6Tamron 70-300mm F4.5-6.3 Di RXD
Focal
Focale		150mm200mm70-300mm
Aperture /
Ouverture		F5.6 fixedF5.6 fixedF4.5-6.3 (F5.6 at 200mm)
Weight / Poids500g412g (441g with lens hood)725g
Length / Taille105mm97mm148mm
Price / Prix800 euros650 euros450 euros
Min focusing
distance
Distance mini
de mise au
point		150cm200cm80-150cm
Macro ratio
Ratio Macro		0,11x0,31x
Focusing Ring / AF
Bague de mise
au point. / AF		AF200°AF
Aperture bladeN/AN/A7
Filter size67mm67mm

The Tamron is 40% bigger and 50% heavier than the Kase AF but it is 15-33% cheaper, has a faster AF, a full zoom range and a shorter min focusing distance and much better magnification ratio

Le Tamron est 40% plus grand est lourd que le Kase mais aussi 15-33% moins cher, a un meilleur AF une plage focale complete et une distance min de mise au point plus courte et donc une meilleur rapport de grossissement

Sharpness / piqué

Comparison table of camera lenses with ratings for center and corner sharpness at various aperture settings, including Kase and Tamron models.

At F5.6 there is a little bit better sharpness for Tamron and Sony vs the Kase , also the traditional lenses have a better contrast. As soon as you close down one stop the Tamron & Sony are much better than the Kase

A F5.6, il y a un léger avantage pour les Sony et Tamron vs le Kase, les optiques traditionnelles présentent aussi un meilleur contraste. Dès qu’on ferme d’un cran les performances du Tamron et du Sony se démarquent très nettement par rapport au Kase

Images samples / Exemples d’images

A shelf filled with various cookbooks, including titles about French cuisine and barbecue, along with a 20 euro banknote placed on the shelf.
Kase 150mm F5.6
A close-up image of a bookshelf filled with various cookbooks, including titles in French and a visible €20 euro banknote placed on the shelf.
Kase 200mm
A collection of various cookbooks stacked on a shelf, featuring titles in French such as 'Recettes du Sud,' 'Le nouveau guide du bien maigrir,' and 'La bible du barbecue.'
Tamron at 250m
A Playmobil figure standing on top of a camera lens, with colorful bokeh circles in the background, creating a whimsical effect.
KAse 150mm F5.6
A Playmobil figure stands on a camera tripod with a red base, in front of a blurred background featuring colorful circular bokeh lights arranged in an arch shape.
Kase 200mm F5.6
A Playmobil figurine dressed in formal attire stands on a black base, with a colorful, blurred bokeh background of lights.
Tamron 200mm F5.6
A smiling woman with long dark hair wearing a beige coat and a gray scarf, standing in a busy outdoor setting with blurred background figures.
Kase 200mm
Close-up of a person's eye showcasing long eyelashes and a natural eyebrow.
Kase crop 100%
A young man with a beard is standing in focus, wearing a dark jacket with a speckled pattern, while blurred figures walk in the background.
Kase 150mm F5.6
Close-up of a human eye, showing intricate details of the iris and eyelid.
A young woman with long black hair and a wide-brimmed black hat, smiling softly while wearing a dark coat and a pink scarf.
Tamron at 200mm
Close-up of a brown eye with long eyelashes and defined eyebrows.
Tamron @200mm F5.6 Crop 100%

A young woman with long, dark hair wearing a gray beanie and scarf stands next to a young man with short hair, wearing a blue shirt. The background is slightly blurred with people and colorful lights.
Kase 150mm F5.6
A smiling woman with long hair and a black jacket stands next to a man with glasses and a red jacket, both posing in a crowded setting with blurred background figures.
Kase 200mm F5.6

A smiling man and woman pose for a photo outdoors, with a blurred background of buildings and colorful awnings. The man is wearing glasses and a fur-lined jacket, while the woman is dressed in a dark coat and a colorful scarf.
Tamron

5 Samples of Photos / Exemples de Photos

Good results for a mirror lens : good sharpness, color and contrast for a mirror lens

Résultats bon pour une optique à miroir : bon piqué, rendu des couleurs et contraste

A display of colorful stainless steel water bottles by Waterdrop, including shades of green and pink, arranged on a wooden surface.
A colorful display wall with various containers showcasing different LEGO bricks, labeled 'Pick & Build'.
A close-up of a rustic wooden fence with pointed stakes, intertwined with wire, set against a blurred background of dried grass and foliage.
A person pushing a stroller crosses a colorful striped pedestrian crosswalk in an urban setting.
City street view featuring a modern glass and wooden high-rise building in the background, flanked by traditional buildings and decorated with heart-shaped ornaments.
A close-up view of a historic building with ornate architectural details, featuring statues on the facade and a digital screen overhead. The building has large windows and decorative columns, with a banner that reads 'ALL' and the date 'SEPTEMBER 2023' visible.
Urban scene featuring a railway bridge with colorful graffiti, modern buildings in the background, and a street below with passing cars and pedestrians.
A row of yellow rental bicycles parked on a cobblestone street, with a blurred background featuring people and advertisements.
A group of six young women walking together on a sidewalk, with a bus in the background. The women are dressed in casual winter clothing, and there are construction barriers and bicycles in the vicinity.
Busy shopping street lined with storefronts and signs, featuring a diverse crowd of pedestrians walking, some pushing strollers, under a cloudy sky.
Two women walking in a busy shopping area, carrying bags. One woman has a Primark bag and the other is holding a box. Shoppers and green plants are blurred in the background.
A group of people walking together on a busy street, chatting and enjoying the day. They are dressed in casual attire, carrying shopping bags, and smiling.
A colorful LEGO display featuring a large astronaut minifigure made of LEGO bricks, with signage promoting the construction of custom minifigures at a toy store.
A young woman walking with a handbag on a busy city street, surrounded by other pedestrians and storefronts.
A young woman in a black puffer jacket and gray pants walking confidently on a busy street, surrounded by blurred pedestrians.
A man wearing a black jacket and gray beanie walks past a parking access area with signage indicating 24/7 service in an urban setting. The background features a large window displaying the word 'ART' in bright colors.
A construction site covered with scaffolding, featuring two individuals engaged in conversation while a third person walks past them.
Two runners jogging side by side on a wooden pathway beside a stone wall, surrounded by greenery.
A woman and a man jogging side by side on a wooden path, surrounded by greenery and a stone wall.
A man wearing a long coat drinks from a can while standing in a bustling shopping arcade with blurred pedestrians in the background.
Two women walking together on a city street, smiling. In the background, people are seated and gathered around, with pigeons on the ground.
Two women walk closely together on a city street, smiling and chatting. One is wearing a black puffy jacket and pants, while the other is dressed in a long black coat. In the background, people sit on benches and walk in a bustling urban environment.
A woman in a black coat stands in a busy cobblestone square, looking around while holding a phone. People are walking in the background, with a vintage vehicle partially visible.
A busy indoor shopping arcade with people walking and shopping, featuring ornate architecture and decorative lighting.
Busy street scene featuring a colorful building with an 'Opera' sign, surrounded by people walking past various shops.
A couple posing together in a covered shopping arcade, smiling at the camera. The woman is wearing a black leather jacket and a dark scarf, while the man is in a brown puffer jacket and blue jeans.
A smiling young couple poses for a photo in a bustling indoor setting, surrounded by blurred figures and decorative lighting.
A smiling woman with dark hair and a warm smile stands next to a man with short hair and a friendly expression. They are indoors, with soft lighting and a blurred background of hanging lights.
A smiling young man wearing a brown jacket, standing in a blurred background with soft lights and reflections.
A smiling young woman wearing a leather jacket and a scarf, posed in a blurred urban background with soft light circles.
A smiling couple poses for a photo in a bustling indoor space, surrounded by blurred figures. The woman wears a black coat and a red beret, while the man is dressed in a black jacket and light jeans.
A woman wearing a pink hat and a black coat stands beside a man in a black jacket with speckles, both smiling in a busy indoor setting with blurred figures in the background.
A woman wearing a pink beret and a dark scarf smiles at the camera, surrounded by a blurred background of people in motion.
A young couple posing together in an outdoor setting, dressed in winter attire with a blurred background of people and buildings.
A young couple posing for a photo in a busy plaza, featuring the woman wearing a gray beanie and scarf, and the man in a light blue sweatshirt, with a blurred crowd in the background.
A young couple poses for a photo outdoors, with a slightly blurred background of people and buildings. The woman, with long dark hair and a gray beanie, stands next to a man with short brown hair and a blue shirt. Both are looking directly at the camera.
A close-up of a padlock secured with a chain around a wooden gate, surrounded by greenery.

6 Conclusion (English)

The Kase 150mm F5.6 reflex AF (650$ / 800 euros) is the best mirror lens I have tested : reasonable focal length and aperture (150mm F5.6), good AF, good ergonomics (well dampened focusing ring) . Sharpness average to good like all reflex lens so more at ease on 24/33Mpix, good colors , acceptable contrast (above other mirror lens but less good than traditional lens) , and the typical doughnut bokeh (you like it or not)

On the negative side mirror lens are by design always less good than traditional lens, in general there are more compact, lighter and cheaper than traditional lenses but they have less good sharpness less contrast and no AF. Here indeed it is lighter and more compact than a typical zoom and has AF but the price is very high for a mirror lens, moreover the minimum focusing distances excessively high for a mirror lens at 150cm

If we compare it to the Tamron 70-300mm F4.5-6.3 Di III RXD (450 euros), The Tamron is much better on all aspects except size and weight. Would the price of the Kase would be around 250-300 euros there it could be a valid low budget lens vs the Tamron at 450 euros

So what is the Kase lens for : if you like the doughnut bokeh and like mirror lens , this is certainly one of the best mirror lens you can find , if you are just looking to reach 150mm with quality at the lowest price , other alternatives exist

You can buy it here

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Pros

  • Compact
  • Very good build quality and ergonomics
  • No Distortion
  • AF
  • No CA
  • No Vignetting

Average

  • Weight
  • Average/Good sharpness
  • Doughnut Bokeh balls / Background blur business
  • Good color and contrast (above other reflex lens but below traditional lenses)
  • Resistance to flare

Cons

  • Min focusing distance quite high : 150cm
  • Price
A Sony Alpha 7R camera with a large black lens attached, featuring a focus mode switch and a cylindrical lens hood.

5 Conclusion (Français)

Le Kase 150mm F5.6 reflex (650$ / 800 euros) est une des meilleures optiques à miroir que j’ai testé : focale et ouverture raisonnable (150mm F5.6) , AF, bonne ergonomie (bague de mise au point bien amortie) , piqué moyen à bon comme toutes les optiques à miroir, bonne couleurs, contraste acceptable (meilleur que la plupart des optiques à miroir mais moins bonne que les optiques traditionnelles) et bokeh en forme de doughnut typique des optiques à miroir

Dans les points négatifs , les optiques à miroir sont de par leur conception moins bonne que les optiques traditionnelles: elles sont certes plus légère et compacte mais leur piqué, contraste est inférieur et elles en général n’ont pas d’AF. Ici on a effectivement une optique plus compacte et légère qu’un zoom traditionnel, un AF, mais le prix du Kase est très élevé pour une optique à miroir et la distance min de mise au point est très élevé à 150cm

Si on le compare au Tamron 70-300mm F4.5-6.3 Di III RXD (450 euros), Le Tamron est meilleur sur tous les aspects excepté le poids et la taille. Si le prix du Kase était de 250-300 euros alors il serait une bonne alternative pas cher par rapport au Tamron (450 euros)

Pour quel public est le Kase 150mm F5.6 reflex : si vous aimez les bokeh en forme de doughnut et les optiques à miroir, c’est certainement une des meilleures optiques que vous pouvez trouvez sur le marché. Si par contre vous recherchez juste un 150mm pas trop cher et de qualité, des alternatives existent

Vous pouvez l’acheter ici

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Pour

  • Compact
  • Très bonne qualité de construction et ergonomie
  • Pas de distorsion
  • Pas d’AC
  • Pas de vignettage
  • AF

Moyen

  • Poids
  • Ronds de bokeh en forme de doughnut / flour d’arrière plan un peu nerveux
  • Bon rendu des couleurs et contraste pour une optique à miroir mais moins bonne que sur une optique traditionnelle
  • Résistance au flare
  • Piqué Moyen à Bon

Contre

  • Distance min de mise au point ptrès importante pour un 150mm : 150cm
  • Prix

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