Quote:
Originally Posted by ngcles
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The view through the 43 deg AFOV eyepiece while about the same size will be much less aesthetically pleasing, will have a slightly brighter background sky, the view will seem much more "compressed" and because of the narrowness of the AFOV, will seem a bit like looking down a sewer pipe.
The 82 deg AFOV ep while showing essentially the same slice of sky will be much more like looking out of a porthole, show a more contrasty view and more detail will be more easily discerned due to the higher magnification -- assuming it is a high quality occular -- which an 82 deg AFOV usually implies!
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I like to think of the one with the wider AFOV of the same "amount" of sky as "stretching the light out". The wider one takes the same view and stretches it out over a larger area. The background sky is stretched making it darker whilst the stars, being of zero size, remain the same size and brightness, making the contrast greater. It may not be totally technically correct, but I makes it easier to picture what is happening.