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Re: (fwd) to V or not to V - I couldn't resist it > For many projects, unfiltered photometry requires more care in > analysis than equivalent standard-filter photometry. This is perfectly true (as I also stated before). Well-prescribed standard filters matched for a particular CCD is a good stanting point. With these sets of filters and a CCD, there are good textbooks on precision multicolor photometry. One can learn much from these books, and will be able to get reasonable results without much efforts. On the other hand, there will be no textbook or universally applicable way for unfiltered photometry -- though they can even be more informative under several conditions. When compiling unfiltered (and a mixture of unfiltered and filtered) data, one more needs detailed photometric analysis methods, fundamentals, and astrophysics depending on the objects. I just counted up how the usual steps for unifying these unfiltered (and mixture) data in VSNET campaigns, and there were at least 14 discrete steps before the data become ready for astrophysical analysis. Many steps require specially tuned programs, and need experience to understand what they mean. Regards, Taichi Kato
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vsnet-adm@kusastro.kyoto-u.ac.jp
