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Thanks Allan for these combinations. I must say I had not thought about such a radical setup as an NP101 + 31mm Nagler. This would give a field in excess of 4 degrees at a magnification of 18X.
I have spent some time this afternoon with Uranometria 2000 and a pair of dividers!
Many of your combinations are close to this 4 degree mark, so I wonder about the ability to discern a non stellar object at the edge of the field with such a low magnification. That said, you have given me some great observations to make, I like the first and last ones best, M22/ M28/NGC 6638/6642 spans only 3 degrees and I may just make that with an old 32mm erfle I have. I call this eyepiece "the aweful erfle" and it will give a 3.2 degree field at 22X on my 106 Astrotech.
The last triple of M9 NGC 6356/6342 is just on 2 degrees I should have noted myself. This should be possible with my normal wide field setup of the 27mm Panoptic and the 106AT.
thanks again for your time in listing these objects.
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