Re: A question about a AP155 EDFS with the 2.7" focuser
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Aim it at the sun, then place a piece of white paper at the focus point and measure where it comes to focus. Should be somewhere around 8" from the fully racked in focuser back.
From: Dean Jacobsen <deanjacobsen@...>
Sent: Sat, Jun 20, 2020 9:32 pm
Subject: Re: [ap-gto] A question about a AP155 EDFS with the 2.7" focuser
I guess I could guesstimate the focal point by measuring 43” back from the front of the objective and then measuring how far it is from that point to the focuser barrel.
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