Weasner's Astrophotography Tips Page

ASTROPHOTOGRAPHY - TIPS

Last updated: 4 May 2008

This page documents astrophotography comments, tips, and photos. Contributions welcome. Be certain to see the other articles on the main Astrophotography page.

Subject:	Specifications of camera adapter fitting on rear of ETX90EC
Sent:	Friday, May 2, 2008 14:20:15
From:	James Haight (jimhaight@hotmail.com)
What are the pitch and diameter in mm of the camera adapter fitting on
the rear of an ETX90EC?  I'd like to fabricate an adapter for my JVC
GZ-MG155 camcorder, which has a 30.5mm filter thread.  Thanks and
regards, Jim Haight

Mike here: I searched the Site for "rear port thread" and found one reference to this that said: "It turns out that the back of the ETX is a 1.375 x 24 thread which is the same thing that bicycles use for both the rear freewheel and the left side of the bottom bracket. I was able to use a bicycle lock ring glued to a 1.25 ID tube to make a decent adaptor." That's all the specs I have on it. Keep in mind that if you attach a camera at the rear port you would need to remove the camera's lens. If you can not remove the camera's lens then you would have to use an eyepiece and do "eyepiece projection" photography. Also, you might need to use a counterweight system, especially with a camera at the rear port. For more on counterweights see the Helpful Information: Astrophotography page.

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