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Progress is impossible without change; and those who cannot change their minds cannot change anything. ..."George Bernard Shaw(1865-1950, Irish dramatist, essayist and critic, Nobel Prize for Literature 1925)"

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 Author Topic: A lens combination question  (Read 9739 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
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 « Embed this message on: July 31, 2008, 10:31:29 pm »

I've been reading about lenses, studying optics applets, etc., but I'm still missing how to figure this out:

I have a regular, 35mm film camera with a normal, 50mm, lens.  What are my options for placing a lens element in front of the regular lens (away from the film plane), to achieve either a more telephoto (longer focal length) or a more wide angle (shorter focal length) image?  I just can't picture in my mind what the rays for such a setup would look like.

I'm aware that one can place magnifying adapters between the camera's lens and the camera body, but I want to work with a camera whose lens cannot be removed.

I have a few different camera lens assemblies for my 35mm camera I can experiment with.  I have experimented with various arrangements without achieving a useful effect.  There is probably a simple answer staring me in the face, but I'm having a problem conceptualizing it.

My ultimate goal is to experiment with a digital camera, placing some lens in front of the camera's lens.  I have a Canon PowerShot A580.  The lens is a 4x zoom, 5.8-23.2mm, 1:2.6-5.5

Why would I want to expand on the capabilities of my Canon point-and-shoot?  I need more control over image magnification, and I want to better understand the optics principles involved!

I mentioned the 35mm camera first, because I have more pieces to experiment with.

I have purchased an assortment of 38mm diameter lenses from Edmund's Scientific (double-concave F10, F15, F20; double-convex F5, F10, F15, F20, F30) and have a few other larger diameter lenses I've collected over the years.

What's the concept that I'm missing?  Thanks!
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WelenScos
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 « Embed this message Reply #1 on: April 20, 2012, 04:44:27 pm » posted from:Seattle,Washington,United States

SimplePortal 2.3.3 | Treasury 2.08 ... Ist es eigentlich Non-Canon, dass Non-Canon nicht Canon ist, weil Canon ...
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Gasdasmi
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 « Embed this message Reply #2 on: November 18, 2019, 03:05:04 pm » posted from:Bangkok,Krung Thep,Thailand

Your knowledge allows me to move on, no matter how much trouble.
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Progress is impossible without change; and those who cannot change their minds cannot change anything. ..."George Bernard Shaw(1865-1950, Irish dramatist, essayist and critic, Nobel Prize for Literature 1925)"