Quote:
Originally Posted by AstralTraveller
There are also some 25mm (0.995") eps around but they are typically quite old and now uncommon.
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You still see the 0.965" / 24.5 mm eyepieces in some of the smaller "department store" telescopes (e.g. 50 mm refractors), but most of the brand-name "beginner" telescopes seem to ship with 1 1/2" (31.8 mm) eyepieces these days, and a lot of those have 2" focusers with 1 1/2" adapters.