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Message: <blockquote data-quote="Gijs van Ginkel" data-source="post: 3620730" data-attributes="member: 82596">Steve O4B,The specifications and measured data from the Kowa telescope are from some years ago, as you can see from the eyepieces that either or not available anymore or discontinued. We were at that time (as we are now) very careful with the transmission measurements and if we did not trust them we measured them again, so at that time the transmission was as we presented it. The sample we had at that time was certainly not perfect as far as color reproduction was concerned and that fully understandable also from the transmission spectra. But Kowa most likely has improved its telescopes as seems also from observations from recently produced  telescopes. The problem in The Netherlands is, that Kowa telescopes are difficult to find in binocular/telescope shops, so we have not investigated recent productions.As you can see from the other data, we also measured older Zeiss telescopes and these data are undoubtedly different from the recent ones, since Zeiss also improved its instruments over the years.Gijs van Ginkel</blockquote>