You are correct Martin.

There are some calculations on the ratio of L vs RGB as well. I have numbers ranging from 6:1 to 12:1. Ideally the majority of the data we capture should be L.

However, in practice because of L is more likely to be impacted by light pollution and moon, I have never been able to the match OSC camera's SNR with a Mono camera (say 2600MC vs 2600MM) with the same integration time, no matter what ratio I used0. In my experience for broadband imaging, OSC cameras always yield better results.  This is another topic for discussion though.

In general I agree for broadband targets once we have 'enough' RGB for each target should be capturing the majority of the data in L. 

Don't forget that in some cases the extra RGB are replacement frame submissions where they have been impacted by bad imaging conditions.

This is because Syndicate / Hosted frames are not vetted before we send them to you.

Don't forget that in some cases the extra RGB are replacement frame submissions where they have been impacted by bad imaging conditions.

 

This is because Syndicate / Hosted frames are not vetted before we send them to you.

That´s correct Phil, and I did not even mention those ones. The cases I did mention seem to be initial requests without Luminance data though. Thus I wanted to raise this topic while I feel that we are not using the great equipment that we have in a very efficient way?!

Martin,

I would broadly agree with you on RGB, but where does Lum help with narrowband? I have always found that more individual filter data is better - you can always make a synthetic Lum from your combined data.