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

[arne]

Roland Roberts wrote:
> 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
There are times when you want to collect as many photons as possible.
There are more of those times than times where you need Rc measures.
Arne