jA Comment on the Lenses

[Tom Droege <tdroege2@earthlink.net>]

As noted earlier, the wide open I lens is down 5% at the edge (on a circle 
tangent to the sides of the CCD) and 10% in the corner.

I note that now I have stopped down the I lens, it is down more like 20% in 
the corner.  This surprised my feeble knowledge of optics.  I thought 
everything got better as you stopped down lenses.

Possibly an optics expert can respond?  In any case, we are still 
considerably superior to camera lenses which are often 50% down in the 
corners of images of our size.

Tom Droege