[Aavso-photometry] Re: [AAVSO-DIS] SBIG's New Low-Cost Photometric CCD Camera

[Roland Roberts]

arne said:

> The constraint in this case was only 4 filter holes.  One of those
> holes needed to be "clear" or unfiltered, leaving only 3 filter positions.
> My preferance is BVRcIc, but if you have to leave one filter out, Rc
> gives the least amount of science.

Why does one "need" to be clear?

roland
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