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Greg Marshall
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Greg Marshall's Discussions

Narrowband Filter Choice

Started this discussion. Last reply by Greg Marshall Feb 1, 2013. 2 Replies

I've been dissatisfied with my Astronomik brand O-3 and S-2 filters because they are too broad (12nm) to provide adequate contrast. More specifically, if I adjust exposure and curves to match the…Continue

Tags: filter, narrowband

AT111EDT Focuser "Wobble"

Started this discussion. Last reply by Brian Fredrich Jun 26, 2011. 4 Replies

Hi,I recently acquired an AT111EDT. It is the older style with the R&P focuser. There is a "rotator" on the focuser that looks very good, but I find that when the knob is loosened the rotator…Continue

Tags: focuser, rotator, AT111EDT


Greg Marshall's Page

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To avoid Spam and Bots, to join we simply ask you to describe your primary telescope setup.
AT111EDT, QSI583ws, Atlas mount
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Greg Marshall's Photos

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Greg Marshall's Blog

Welcome Back, Neal

Posted on June 16, 2015 at 9:10pm 0 Comments

It was great to see Neal Heacock "back in the saddle" - and for 4 straight nights! Watching him at work it seemed like he hadn't been away at all.

The skies were not great on any of the 4 nights, but most of us were shooting things barely above the southern horizon because around here this is the only chance we get to shoot them. Well, this year July should be good also.

There were 7 people (all imagers) and most stayed all 4 nights. Skill levels ranged from "master" (Neal) to…


Focus Motor for SCT

Posted on December 26, 2013 at 12:57pm 0 Comments

I got an 8" EdgeHD scope a while ago and have just finished development of a focus motor for it. I am now offering the "PerfectStar SCT" along with the PerfectStar Focus Controller. The PS SCT motor was developed specifically for the EdgeHD series and will be available more or less off-the-shelf for 8", 11", and 14" scopes from that family. Most SCTs use the same kind of mechanism, so the design is easily customized to other models, but specific dimensions vary, so I am concentrating on the…


2014 Calendar of Astro-Photos

Posted on November 6, 2013 at 12:13am 0 Comments

As in previous years, I have produced a calendar of my best recent astro-photos. This year the calendar is a little bigger (12 x 9 inches) and has more information about each object, including a sky chart on the back cover that shows where each object is located. That makes it an even better gift for people who are not familiar with astronomy. And the price is still just $15! To order, send me an e-mail through my web site:…


PerfectStar Focus Controller and Motor

Posted on April 21, 2013 at 10:20pm 0 Comments

I've just released an all new version of the PerfectStar Focus Controller firmware and driver. The new version adds several new functions and enhancements, including greater robustness. At the same time, I am announcing a new PerfectStar Focus Motor that fully encloses both the motor and the focuser coupling. I am now using Hurst motors, the premier manufacturer of stepper motors. For details, see…


Comment Wall (5 comments)

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At 4:52am on April 21, 2015, carlo colombo italiano milanese said…

sono veramente ammirato per il tuo lavoro, complimenti. c.colombo astrofilo milanese

At 7:54am on February 26, 2014, Greg Marshall said…

Carlos, please go to the contact page of my web site: The address is there in an encrypted form.


At 7:32am on February 26, 2014, Carlos Beer said…
What is your email to order one if those T-mount rings for a Canon 60Da?
At 11:12pm on June 9, 2012, Dennis Recla said…

Greg, I need a motor focus for my AT111 - I liked what you had up at the imaging conference.

At 11:01am on May 14, 2011, Trevor Woodrow said…
Welcome Greg!


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