Re: How do you test if camera lenses match?

[P3D Dr. George A. Themelis <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

>>>Really, the simpest way is use film, develop it, and scan it. 
>> 
>> What do you mean by "scan it"?
>    
>Scan it with a 35mm scanner.  

Hmmm, just what I suspected.  Then it is not the simplest way.  You are 
assuming access to a scanner, a computer and an understanding of what 
"centroid them to mucho subpixel accuracy" means!

>If you use small circular targets, or
>whatever, you can centroid them to mucho subpixel accuracy, but just
>noting +/- a pixel is going to get you easily past 1% accuracy.  For
>that matter, I suspect carefull use of a micrometer will do fine.

If I was going to test lenses for FL match I would take two slides and
mount them in an Albion mount.  By aligning the bottom of the images
I can see how well they match at the top by using the aluminum mask
as my reference.  

Now, that it simple!

-- George Themelis


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