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Hi Alex,
Interesting - I hadnt thought of that. I will give it a go probably with the UHCS closest to the the main telescope objective to minimise reflections between the filters. I always like new things to experiment so that goes top of the list for the next prime focus imaging session. (Really need to get an autoguider!).
Monoxide is right. If imaging is the only consideration you dont need any more than a UHCS. For visual however the UHCS darkens things considerably and gives a prominent greenish appearance. Not so nice for planets especially. The semi-apo really excels here. Mind you the UHCS lets through lots of light at the key wavelengths of importance for photos.
The other nice thing about a UHCS is that you can stack with a red filter and it acts like an H alpha filter. So its a good multipurpose filter. Havent tried this yet but Baader say it works.
Cheers
David
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