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Questions tagged [mirror-lens]

A type of lens that uses mirrors for some of its optical elements.

3
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1answer
85 views

The lower half of my pictures are black and the rest is normal?

I have a Canon Rebel T3 and everything was working fine when today I took it out to take some shots half of my pics and videos are black nothing is stuck the mirror mechanisam seems to work fine .. ...
0
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2answers
473 views

Is two teleconverters on a sigma 150-600 sharper than one on a 1100mm mirror lens?

I was considering taking photos of the moon and stumbled on a review of the MTO 1000a mirror lens. This is acording to this site a sovjet design from the eighties of an 1000mm mirror lens. (Some other ...
1
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2answers
356 views

What does lens flare from a catadioptric (mirror) lens look like?

Can one get lens flare with a mirror lens? What does it look like?
6
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2answers
938 views

50mm mirror lens. Does one exist?

I like the bokeh and limitations of mirror lenses. I however, also love my 50mm 1.4. Does a 50mm mirror lens exist? I searched but could not find one. If not 50mm what is the closest to 50mm one can ...
3
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5answers
3k views

What's so bad about a mirror lens?

Ever since falling in love with my Sony a6000, I'm always looking around for something to purchase - and there are quite a few Catadioptric mirror lenses, like the Walimex / Rokinon / Samyang 300 mm. ...
0
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2answers
188 views

Catadioptric lens: equivalent focal length and focus at infinity

I recently bought a Rokinon (=Samyang) 300 mm catadioptric lens for use with my Fujifilm x-e1 mirrorless camera. It seems to work OK, but there are two things I don't understand about it: This review ...
4
votes
2answers
331 views

Can deconvolution help improve the apparent sharpness of mirror lenses?

I have recently ordered a Samyang 500 mm/f6.3 mirror lens on eBay, for about £80, largely out of curiosity -- at the very least, it will be an interesting toy and I can always sell it. Mirror lenses ...
4
votes
4answers
288 views

How do catadioptric camera systems show the whole frame despite mirror obstructing the center?

I am a beginner and I recently started reading about catadioptric systems. While I understand how they can be used to simulate longer focal lengths, I am still confused as to how the entire frame is ...
5
votes
3answers
1k views

Is there any physical reason a mirror lens could not have a variable aperture?

I understand that mirror lenses already have high maximum apertures and that often, the last thing one wants to do is let in less light, but is there a physical reason that one could not build a ...
1
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1answer
322 views

Why do old-school catadioptric lenses have a fixed aperture?

Pretty much what it says on the tin. As far as I can tell, catadioptric telephoto lenses (operating on a similar principle to many telescopes; using mirrors rather than refraction) fell out of favour ...
1
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2answers
508 views

Why do mirrors give less sharpness, gamut, and contrast than lenses?

What is the scientific reason mirrors give less sharpness, gamut, and contrast compared to lenses? Ex. Is it an inherent property where light dissipates more when scattered compared to going through a ...
3
votes
2answers
438 views

Do I need to calibrate my mirror lens?

First off, I'm sorry for the slide-show, but I've had this lens a long time now and I'm fed up with it. A while back I tried adjusting this ring to either extreme and couldn't see a difference. No ...
0
votes
1answer
298 views

Mirror lens for Nikon D5200 camera [duplicate]

What is a good mirror lens for my Nikon D5200? I love taking wildlife pictures and need a better telephoto lens. I am using a Nikkor 55-300 AF and it works well, but I need about twice that power. I ...
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1answer
117 views

The LCD is blank with my 500mm/F8 Nikon mirror lens on my Nikon D200 when I shoot

When I use my Nikon 500 MM mirror lense I do not get a view of my subject through the LCD, I have to use the viewfinder. I would prefer to see the image via the LCD on my D200 before I take the photo
8
votes
1answer
381 views

What kind of mirror in a mirror lens?

A normal mirror, that we see for example in an elevator, is a glass sheet with thin metal coating on the backside, so light reflecting from the metal surface goes first thru the glass. Metal mirror (...
9
votes
4answers
2k views

Co-linear dual tripod mount for huge lenses

I am about to buy a fun super-zoom mirror lens which is so long it has its own tripod mount. To protect the camera, I am wondering if there is a mount accessory which will allow for two items to be ...
17
votes
2answers
934 views

Why do mirror lenses have poor contrast?

I was reading this question on mirror lenses and the answers taught me a lot about mirror lenses. It is pretty obvious to me why they have donut bokeh (central obstruction) and why they are fixed ...
17
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5answers
54k views

Are mirror lenses good for wildlife photography in daylight?

I've recently seen these Rokinon/Opteka mirror lens with whooping focal length (like 500mm, 600mm, 800mm, 1000mm) at a cheap price. And I have seen some of their same pictures in Flickr and vendor ...
8
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1answer
2k views

Are mirror lenses appropriate for DSLR astrophotography?

There's a whole host of inexpensive mirror lenses available in the 500 mm - 800 mm range (this for example). They have slow max apertures (f/5.6-8) and a donut shaped bokeh (not a problem ...
8
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3answers
2k views

Cameras using mirrors instead of lenses?

In astronomy, telescopes are most commonly built with mirrors, but there are refractors using lenses. All cameras I know of for Earthly purposes — portraits, landscapes, etc. — use only lenses, not ...