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Old 18-02-2010, 04:55 PM
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floyd_2 (Dean)
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Join Date: Dec 2009
Location: Cecil Hills (Sydney)
Posts: 546
Focusing DSI II Pro Camera Through a Ha CCD Filter

I was outside last night wondering why I couldn't focus my LX200GPS SCT using a Bahtinov mask. I have focused many times before this way. It took me a while to realise that I was using my new Astronomik Ha CCD filter for the first time on my DSI II Pro filter slide.

I switched to my IR filter, and Bingo, focusing was a doddle.

I realised that I had to look VERY closely at the screen to see any spikes at all using the Ha filter (der...it's blocking the light). In fact, the spikes were represented by three very tiny dots. As I shifted focus, the middle dot moved left or right.

Does anyone have any tips for focusing using a Bahtinov mask and an Ha CCD filter by any chance?

Dean

Last edited by floyd_2; 18-02-2010 at 04:57 PM. Reason: Learn how to spell focusing, Dean :^/
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