Re: [APML] Orion Short Tube 80

["Frank Barrett" <frankb@celestialwonders.com>]

Don,

 

Thanks for the reply.  I'm actually considering the 120 as well so this is good info.  The Orion Summer catalog mentioned something about the ST80 having T-threads on the focuser for direct camera attachment, so hopefully that means less of a vignette problem.  Don't know about the focus issue though,,,

 

Frank

http://celestialwonders.com

----- Original Message -----

From: Don Spencer

To: Discussion of Film Astrophotography

Sent: Monday, October 20, 2003 2:14 PM

Subject: Re: [APML] Orion Short Tube 80

Hi Frank,

              I have used the Orion Astroview 120 (also a short tube). Even with the minus violet filter, you will get some blue fringing around the brighter stars:

http://members.cox.net/ecdon/M8_M20.html

 

The 120 has a 2" focusor and I was getting some vignetting with it, but not too bad. I would expect (if the 80 has an 1 1/4" focusor) that it would be a liitle worse with the 80mm. Also be aware that I had to buy extension tubes with the 120 to meet the focus for the camera.

Don Spencer

---

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