Re: Eclair Cameras: Lens testing procedures

[Wade Ramsey <wramsey@bju.edu>]

C.J. wrote:

> ...A nice piece of optical equipment is the lens projector.  One could be made
from a slide projector.  The slide is an almost perfect resolution pattern
and the correct lens mount would have to be installed on the projector to
take the lenses....<

The lens mount would have to be rigidly mounted and aligned to be centered and perpendicular to the slide.  Misalignment would give false indication of resolution falloff on the sides of the image.  The slide would have to be a glass (or at least a glass mounted) image of a resolution chart, providing lp/mm numbers so you'd be able to compare lenses to each other and to a resolution standard you determined was acceptable.  This slide would have to have  the correct size image for 16mm or S-16 for these numbers to be accurate.

So it could be done, but it will require some good measuring and machining.

Wade K. Ramsey, DP
Dept. of Cinema & Video Production
Bob Jones University
Greenville, SC 29614

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