William Robb wrote:
----- 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....
That has about the same validity as testing flash bulbs.
William Robb
keith <BG>
