Quote:
Originally Posted by W9TR
First try the Barlow on your 26mm eyepiece. This will get you the equivalent of 13mm, twice the magnification of the 26mm. The advantage of a Barlow is the eye relief, the distance you need to keep your eye away from the eyepiece stays the same.
Then you can try the 9mm, which is approaching my the limit of what your scope can handle.
A 4mm is useless, just provided so the marketing guys can advertise a high magnification.
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Well, to be fair Meade does not sell the ETX90 with a 4mm. And for a high quality small refractor 4mm can work fine. But not for a medium quality 90mm MC with 1250mm focal length.