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2 votes

How does the Elgeet 1/2" f2.3 lens work on the Keystone 8mm K25 Capri movie camera

The distance shown in the window is not a focus distance. It is a distance recommendation, measured in feet from the subject, for the placement of specified lighting when using the film at an indoor ...
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-1 votes

Dating a Canon lens without date codes - just an eight digit serial number. Is it doable?

Yes I know this is a very old thread, with the question still relevant. I'm in the process of trying to buy an old Canon lens and figure out how old the lens is. As mentioned already, there doesn't ...
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1 vote
Accepted

Do photographic lens show virtual image if the subject distance is less than focal length?

The camera lens acts much like a projection lens it that it projects an image of the outside world onto the surface of a light sensitive surface such as photo film or digital sensor. The power of the ...
  • 36.6k
2 votes

Do photographic lens show virtual image if the subject distance is less than focal length?

A camera takes a picture from the rays received at a given sensor plane. If this plane coincides with the plane where a real image gets projected by the lens, the sensor will pick up that image. As a ...
2 votes

Do photographic lens show virtual image if the subject distance is less than focal length?

Because "virtual" is not "real". The "virtual" image is just something used to allow reasoning and computation, it has no physical existence.
  • 17.3k
2 votes

Can a broken film sprocket mechanism on a Minolta 7000 AF be fixed?

It's very hard to say if a broken camera is (economically) fixable, without someone spending time examining it. There are not many places offering repair services on cameras like this - the problem is ...
  • 9,251
1 vote

I want to match same field of view with different focal length is there any formula?

As you know: A camera working at a specific subject distance with a specific lens focal length will image a specific field. As an example: 35mm FF format 24mm by 36mm with a 50mm lens mounted, 5 units ...
  • 36.6k
0 votes

I want to match same field of view with different focal length is there any formula?

You can't... You can change the distance proportionally so that the subject occupies the same area of the image, as described by Wayne. But that will not change the FoV/AFoV, which is an intrinsic ...
4 votes

I want to match same field of view with different focal length is there any formula?

If you swap to a lens with focal length twice longer, you have to stand back twice farther, to duplicate the same field of view. Or (concerned about the nit-pickers) move the subject back twice ...
  • 12.6k

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