Thanks Kostas -- I'll take a look at the MTF
diagram if I can find one.
Don
Kostas Kavoussanakis wrote:
On Fri, 6 Jan 2006, Don Williams wrote:
The awful chromatic aberration of an very expensive Schneider 360mm
telephoto I had for many years made me very much aware of the problem.
But a few years ago I got a Sigma 5.6/400 APO and the images are very
clean. That was my reasoning.
From what I recall reading here, the Sigma in q needs more than APO to
be used as you go towards its long end.
Kostas
--
Dr E D F Williams
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