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Re: A question about a AP155 EDFS with the 2.7" focuser

Geert
 

I would prefer using the Moon to find the focal point, unless you want to set fire on a piece of paper :-)

Geert

Op zo 21 jun. 2020 om 18:42 schreef uncarollo2 <chris1011@...> via groups.io <chris1011=aol.com@groups.io>:

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.

Rolando



-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
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.
--
Dean Jacobsen
http://astrophoto.net/wp/ 
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