Archived posting to the Leica Users Group, 1998/06/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 03:20 PM 6/6/98 +0200, you wrote: >Eric's remark that the coverage of image field is also a criterion is not >correct. Are you saying Leica doesn't demand apochromatic correction across the image field, edge to edge? I seem to recall Leica stating that very thing. Not everything some Leica people say is true, for sure, but they don't tend to make such official pronouncements if it's not true, in my experience. And your comment about glasses having apochromatic characteristics is misleading, no? No particular glass could be so described. It's a combination of glass elements that brings about apochromatic correction. Do you mean some glasses have high refractive index and anomalous dispersion characteristics which makes such correction possible? As many people in the past have said, there is no such thing as APO glass. - -- Eric Welch St. Joseph, MO http://www.ponyexpress.net/~ewelch Actual newspaper headline, 1/17/77: "Cold Wave Linked to Temperatures"