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Yeah, that's in line with other planetaries I've images in the past few months. There's something odd going on.
I've compared it to my ED80 with flattener and taken note of the shutter speeds required for correct exposure for both scopes. With identical settings, the same target is slightly BRIGHTER through the ED80. Focal ratios for both, allowing for CC and flattener, should be f/6.375 for the ED80 and f/5.5 for the Newt. I'm missing about half a stop.
How should the two compare in the real world? Can the light blocked by the secondary take as much as half a stop?
Think I might start a new thread for this.
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