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Thanks Steve.
F4.45, 17 inches of aperture and 61% QE and good seeing and "relatively" dark helps.
You got to watch the flats and gradient control with this scope though.
Its part of the compromises the designer makes - smaller central obstruction for sharper and more contrast images but more vignetting. 38% is a small central obstruction compared to the BRC250 I used which is over 50% I think. It keeps you on your toes with your gradient processing techniques though!
Thanks for the tips for the galaxy groupings.
Greg.
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