Quote:
Originally Posted by julianh72
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.
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That would be 1 1/4" not 1 1/2" and just to be really picky, 31.75mm often rounded to 31.7mm since 31.8mm definitely will not fit.
Being in Australia we have had the luxury of both the imperial system and the metric system and in amateur astronomy both seem to mix seamlessly. e.g A 12" telescope with 1500mm focal length.