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Re: [APML]: PJM limits



>> The Pleiades is reflection. Reflection nebulae are blue and emission
nebulae
>> are red.
>
>I'm aware of that, and that's exactly my point: I think the DeepSky filter
helps
>with reflection nebulae by reducing the sky background, not by passing any
>specific wavelengths as it does with emission nebulae. .


My understanding is that the DeepSky filter does not help with reflection
nebulae.  

Consider, reflection nebula reflect a relatively continous spectrum from
the stars that illuminate them, so that light is filtered by the DeepSky
filter too, as well as the sky background.

Jerry