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Re: My V visual observing technique and a sad story..... > The message (from Taichi Kato) made a comparison between visual and CCDV > magnitudes of R Lep: The main intention of my analysis at that time was to better illustrate the wide range of visual color sensitivities (with unspecified measuring techniques), but not to discuss the deviation from the "true" V band. Such an experiment can be better done with the "reddest" objects, for which I selected an extremely red star R Lep. This experiment was originally intended for two special reasons: (1) There is a widespread belief that the visual sensitivity can be well expressed with a nearly single "transformation coefficient", and there was a movement to "correct" comparison star magnitudes on visual charts, rather than using V magnitudes. I had to repeatedly express a worry about this oversimplified treatment. I understand that this approach was overthrown, and was taken over by a better and rational approach to limit the color indices of the comparison stars. (2) There was an AAVSO experiment to determine this "coefficient" using the SS Cyg field (and I remember that this field selection was a target of complaints from southern observers...). I simply tried to show that such a coefficient (if any) can be determined from the existing data with a smaller bias (from the observer's degree knowledge in the experiment prescription), and probably a better accuracy. I don't think the field of SS Cyg is particularly suited for this kind of experiment. Regards, Taichi Kato
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