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Hi Mark,
Ah yes. I forgot about the flattener/reducer. I do have one, and have used it quite a bit. Lately I've been going for smaller targets and decided I needed the extra focal length. (And you should see how stretched the stars are in the corners of the non-flattened images!)
I've been using the astrophotography tools CCD selector to try and narrow down which camera works best with my scope - both with and without the reducer.
Whilst the 183 and 294 fit more into the "green" region of the selector than the 533, I have heard a lot about their amp-glow and being a bit difficult to work with - hence my leaning towards the 553.
I can't see myself getting a bigger scope for quite a while (and the HEQ5 limits me to smaller OTAs anyway) so a reduced "future-proofing" is acceptable.
Cheers,
Steve
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