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hi Graham. undersampling will give you increased sensitivity, so you need to aim for bigger pixels and accept that the image scale will be small and that you will get wide field of view at the expense of less resolved detail.
A QHY8 or even a QHY10 on your scopes would be fine without a Barlow (especially the 250f4). The QHY12 would give more resolution and larger scale, but it will probably be somewhere round 1/2 as sensitive as the 8. I would stay away from cameras with small pixels if you are seeking high sensitivity. It is a good idea to have a camera with adjustable focal plane tilt with your f4s - I think that all of the latest QHYs have that option.
I can relate to your desire to go OSC - I have quite a few datasets waiting around where I just need maybe 1/2 the green and all of the blue to complete, but the weather will just not cooperate.
Last edited by Shiraz; 04-08-2015 at 06:07 PM.
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