Quote:
Originally Posted by astro744
The width of the field is a function of focal length and field stop diameter for visual and sensor size for imaging. Unless you have 4" f15 refractor, the focal length of most commercially available refractors is much less than reflectors and hence are capable of a wider field.
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I was thinking of a small "dob" like mine...
By the way, something that surprised me is with my new refractor is that I tried my 8mm eyepiece with a Barlow lens (2X) by pointing at a partially illuminated house (a wall in the distance) at night (no planets or anything in view unfortunately) and it worked. It is a 90mm (aperture), 1000mm focal length refractor. The magnification with the Barlow is 250 which should be too much for my scope, but although the focus was not perfect it was pretty good ("almost there"), and lots of details were visible. Maybe because it was a relatively close terrestrial object (no air turbulences?). It was really an experiment, I didn't think it would work at all at that magnification.