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

[Roland Roberts]

arne said:
> Roland Roberts wrote:
[...]
>> Why does one "need" to be clear?
>>
> 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.

I'm sorty for being slow, but if I'm doing photometry, when would I "need" a
clear filter?  Getting more photons is well and good, but if I can't assign
them to a color band, I've got a completely uncalibrated result.

What am I missing?

roland
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