Quote:
Originally Posted by squeak
i have a celestron powerseeker 127,with a claimed focal length of 1000 mm.the max distance that i can measure, from the primary mirror to my eye,is 500 mm. could someone please explain this (apparent) discrepancy ? also, the eyepieces that came with it are "k 20" and "sr 4" . what do the letters stand for? ( my 10" dob, f/l 1200 mm, does measure 1200 mm from primary mirror to eyeball) thanx.
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It has an internal Barlow lens, which is a bit of a rip-off really.
Out of the box the collimation tends to be horrible too, you may want to sort that out to get better images.
I'm guessing the K stands for Kellner 20mm, the SR for Symmetric Ramsden 4mm, a truly horrible eyepiece for that scope, with zero eye relief (you almost have to place your eyeball inside the eyepiece to use it).
-Peter