Re: How do you test if camera lenses match?

[P3D John Ohrt <johrt@xxxxxxx>]

P3D Sam Smith wrote:
 
> Have you considered making paper negatives with standard B&W photo paper?
> You can't beat this for a low cost alternative. Just cut a sheet ( under a
> safelight of course) to fit the film area, and exposure it at an ISO of
> around 5.

Nice approach, makes scanning even easier. :-)
 
> When I'm testing lenses these days, I first have to determine that the
> camera is correctly focusing at infinity. This is critical, as if your focus
> is even a little bit of the image size will change. I now do this with a
> home-made collimator.

I would be interested to hear more about your collimator, here or in
tach-3d as you wish.

Regards,
John
--
John Ohrt,  Regina, SK, Canada
johrt@xxxxxxx


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