Questions tagged [lens-design]
Of and relating to the specifics of lens construction and manufacture.
267
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What is the lens diagram of this Pentacon 50mm F1.8 multi coating lens?
I'm trying to find detailed lens diagrams (showing the lens elements) of this old prime lens I have but I can't seem to find anything. Does anyone know where could I find it?
Here are some photos of ...
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4
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Which is the cause of Barrel and Pincushion distortion?
Barrel and Pincushion distortion are due to the fact that the magnification of the lens changes as you get further off axis.
Let's consider a single thin lens with an aperture stop. These two pictures ...
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199
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Why do some lenses have a rounded front element?
I've noticed that some lenses, mainly wide-angle or fisheye (e.g. Samyang 14mm f/2.8, or Nikkor 8-15mm fisheye) have a rounded front element.
Which is the reason for it? It's of course limiting in ...
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Why won’t the aperture adjust on my Sony A camera? [closed]
I recently bought a telezoom objective without built-in AF. I did not bother because my camera has an AF which could handle the focus on such lenses.
I always had used lenses with built-in AF so I did ...
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What determines the image circle diameter?
Anywhere in the web it's stated that the image circle diameter depends on the lens design. I'm curious to understand it a bit better.
Let's start with basics. Let's consider a single thin lens ...
- 514
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2
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298
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Why are lenses of large-sensor smartphones so small? Could system camera lenses shrink as well?
The photo sensors of some recent smartphones are approaching sizes so far reserved for system cameras with interchangeable lenses. For example, the Google Pixel 7 has a 25 mm equivalent f/1.9 main ...
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3
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203
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Do photographic lens show virtual image if the subject distance is less than focal length?
A convex thin lens produces a real inverted image if the subject distance from the lens is higher than the focal lens.
If it is lower, the image will be virtual. Of course a virtual image appears on ...
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Why does Nikon Micro-Nikkor 55mm f/3.5 pre-AI show 1:1 markings when it can only get to 1:2?
I own this (mechanically and optically superb) lens since quite some time and was wondering why the blue marks that say 1:1, 1:1.5 and 1:2 don't actually correspond to the reproduction ratio that the ...
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What lens would suit an A4 large format camera
I'm planning on building a scanner camera. The principle of which is simple: everything's built like a large format camera, except the film is a simple scanner controlled by computer.
Now, building ...
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Smear/spread at the edges of a phone lens [duplicate]
My google-fu is failing me on this, because I don't know the term I'm looking for.
At the edges of a simple group shot of five or six people taken with a smartphone, there is a tendency for the faces ...
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Do third party lens manufacturers need the camera company's permission/licence to produce and sell compatible lenses?
I was wondering if lens manufacturers like Tokina, Sigma, Samyang etc, need some sort of permission from camera manufacturers in order to produce and sell their compatibles lenses or if any company ...
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Why isn't my camera body white?
If I leave it in the sun for a few minutes, even in winter, it gets pretty hot. In summer, I'd have to shade it as it has been too hot to touch. This makes remote-triggered wildlife photography and ...
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3k
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How would a curved sensor change camera and lens design?
I've read that lenses are designed to project an image onto a flat surface and that as image sensors grow larger, lenses will grow correspondingly larger and by some additional factor. Flat imaging ...
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How does using more spherical lenses compensate for spherical aberration?
I've heard of three common ways to compensate for spherical aberration:
Small aperture (fewer non-paraxial rays).
Aspheric lens (compensate with lens shape/material).
Corrective spherical lens ...
- 111
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Decrease FF lens focal length for use on APS-C and still have it focus?
Need to convert very cheap vintage FF 50mm f/2.8 lens to work as 35mm lens for for APS-C, for having wider angle of view.
Its kind of works by simply placing lens closer to camera sensor (without ...
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