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16deg lense looks good, ultimately 180deg is the best. Webcam may not have a lot of light receiving capability. A low light camera would be the best.
I have one I will be testing that is reasonably economical, although I haven't got a 180deg lense for it yet. I was going to test it for distant planets but I have had to place that project on hold.
The lense is cheap so I wouldn't be too fussed about buying it for test.
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