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Where to buy/scrounge a small converging lens?
I need a simple 20-25mm diameter (slightly larger can work if it's plastic) lens with a 40-50mm focal length. It's for a lightmeter I'm building. I'm just having a hard time finding anywhere online or in the real world where I can buy such a simple lens element.
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Did you try www.surplusshed.com ? They appear to have several.
Go to the categories menu on the left of their main page and select the lens finder.
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No, I'll try it out. Allelectronics has several but not the right ones.
edit: Wow, they have every sort of lens.
Last edited by BetterSense; 08-15-2009 at 04:48 PM.
f/22 and be there.
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How about lens/viewfinder from a disposable camera or a box camera, it is a bit smaller bit might work. If a complete lens block is ok for you then those 40/2.8 objectives/viewfinder on cheap 70s compact might work too.
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Try an optician that makes their own spectacles. Some of them have a little 'factory' on the premises. See if they will let you have a lens blank. These are about 40cm diameter. You'll need a 20 dioptre convex lens with no prism or cylinder.
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I'm sure I have one somewhere. If you can't get one locally, let me know by PM and I will post one to you.
Steve.
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Suplusshed had exactly what I was looking for. I was able to buy several 20mm diameter, 50mm focal length DCX lenses and a 20mm diameter, 17 mm focal length, for $4 each.
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