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Old 06-01-2018, 05:44 PM
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astro744 is offline
Join Date: Apr 2007
Posts: 1,132
I meant loosen not tighten and have corrected my post. The eyepiece has to move toward the primary mirror or the primary mirror has to move toward the eyepiece. If the latter note edge of field illumination will drop a few percent as the secondary is now undersized for the wider light cone due to the primary being closer. You wont really notice it if you only move the primary 10mm and loosen the collimation screws a fraction. You first need to determine exactly where the focal plane is so you know exactly how much to move.

A low profile focuser is your best option but you must be certain of your current and proposed low profile focuser racked in height to make sure it is low enough. I would loosen the primary mirror collimating screws first before spending any money as you may just have enough to reach focus.
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