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Hi Mel, the 50mm Lunts Hugh has linked to in his post (LS50Tha) are likely to deliver what you are asking for. B400 blocking filter will be fine, especially if not imaging. I note that Andrews are showing double stacked scopes in both pics for some reason. What you will get will look different. It won't have the dark red (tilt-tuned) front filter unit attached unless you specifically order a double stacked unit.
@Hugh - Yes, double stacking will increase contrast on the disk. By logic that should bring out features not visible in single mode, but because double stacking also dims the image, I haven't been able to answer that question for myself yet. So my inconclusive observations so far are that the amount of detail visible is about the same (but easier to see), and the image dimmer and more contrasty (some say more aesthetic), than single stack. Comparisons were made using the pressure tuned Lunt LS50Tha.
What was the lowest power you used in your PST - reason I'm asking is that the 10mm EP that came with my LS35Tha does not to that scope justice. Too much power, soft image. I use 18mm and 25mm orthos in that scope, and the views are superb. Single stack that is. Low power, of course.
It would be interesting to see how your achro (plus an extra barlow) would handle the daystar. More glass etc but probably still in a different class to the 50mm scopes. Alternatively, you could stop the achro down to f/7. Still better than 50mm, surely. I haven't tried either option myself but that's what I'd do if I was looking into H alpha gear at this point.
Last edited by N1; 12-01-2017 at 02:08 PM.
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