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Date: Fri, 4 Jul 2003 17:05:57 +0200 (CEST) From: Ulisse Munari <munari@pd.astro.it> Subject: [vsnet-photometry 20] On vsnet-obs 45730 ---------- Forwarded message ---------- Date: Fri, 4 Jul 2003 15:41:18 +0200 (CEST) From: Ulisse Munari <munari@pd.astro.it> Subject: [vsnet-photometry 20] On vsnet-obs 45730 There is also another possible mattern of concern. From time to time I received amateur photometry that diligently specifies that the data where obtained with a "V" band or "visual" filter and CCD camera, failing however to note that the filters in questions were ment for photographic of photoelectric work, where the V band filter is essentially a long-pass filter (like the standard GG14 or GG11) and the red-edge of the band is the result of drop in sensitivity of the detector (emulsion of photo tube). With CCDs, the red edge extends into the far red, and if used in conjunction with long-pass V filters (instead of more appropriate red-blocked ones suited for use with CCDs), the range of wavelengths imaged runs from V up to I band included. regards Ulisse Munari
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