----- Original Message ----- From: "Godfrey DiGiorgi"
Subject: Re: The DA retested and loved again!
When I worked for NASA/JPL and was helping to select lenses for a data acquisition project, we'd have manufacturers send us 20 examples of their best primes in the focal lengths required. I put them on the light table and did resolution chart tests, and all the ones that didn't hit the top numbers within 1 sigma were returned. There were usually three of them that hit within 1 sigma of the same quality in any batch of 20; that's normal variation. This goes for any brand of mass-produced lenses.
gee, think of how many astronauts would still be alive if they tested rockets the same way....
William Robb
