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zelonisv_bob
I currently use a 2" 2X "focal extender" for planetary, Moon and Sun imaging at prime focus. But, because I already had the equipment to do it, I tried eyepiece projection using the proper adapter and a 25mm orthoscopic eyepiece. The result was absolutely awful: stars that were outside the center of the field of view were shaped like teardrops which became larger the farther away from center they lay! Is this normal for eyepiece projection or could there have been something wrong with the eyepiece internally? I did not try other focal lengths of orthoscopic eyepieces on that night.
If eyepiece projection is NOT advisable at all for imaging, then would focal extenders/Barlows of greater power be the way to go? Does the quality of images decline as the power increases, such as 2X to 5X? I have a range of focal lengths in my collection of University Optics orthoscopics (purchased in the 1970's) and would be saddened not to be able to use them for imaging.
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