2 in-line filters

[piprees]

Without doing a lot of experiments, would it be possible to have a Ha filter fitted permanently, and, at the same time, use a filter wheel for red, green and blue filters? And if so, what would be the down side? I'll be using a Zwo 1600 cool.

Regards,

P.

[ronin]

By rights you should get nothing or Ha, and dimmed Ha.

The Ha would allow Ha through, this woul be blocked/absorbed by the Green and/or the blue. The Red filter if wide enough should allow the Ha through.

So Ha or nothing.

If the Red dos not quite extend to the Ha end of the spectrum then that would also block the Ha, so then nothing immaterial of what is inline with the Ha.

[piprees]

Thanks ronin, yes, of course. Could using the Ha instead of luminance with rgb work or would thing be better using one as well as luminance and rgb. It would be mainly for nebulae. These are basic beginners questions but we've all got to start somewhere.

 p