Double stacking H-alpha question

[Carbon60]

Quick question:

:help:If I were to take two etalons from two PSTs and screw one into the other within the optical light path would this work as a 'double stack' to narrow the bandwidth and increase surface detail, or does it not work like this?

Anyone?

Thanks

Stu.

[Merlin66]

Yes, such an arrangement will work as a double stack.

I even machined up an adaptor to hold the etalons together.

Compared with a double stack of SM60 filter (or even a SM60+PST etalon) I found the double PST to be VERY touchy and matching sweet spots was difficult. IMHO using a PST etalon to double stack a larger SM60/SM90 etc is a much better arrangement.

[Merlin66]

http://stargazerslounge.com/diy-astronomer/116286-lads-large-aperture-double-stack-ha-telescope.html

This thread discusses the options and issues.

[Carbon60]

Much appreciated Ken. I can imagine how getting the two PSTs to work together can be rather tricky. It was just a thought.

I'll take a look at the thread.

Cheers

Stu.