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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

Latest Activity

Marc Basti commented on Greg Marshall's photo

Comet Garradd

"Never got a deep one (pretty!!). Mine was in the sunset, but it was cool, some guy showed up saying "I hear there suppose to be a comet tonight'' We had camera and tele. Nice Catch"
Jul 19
Dave Lane commented on Greg Marshall's photo
Oct 27, 2016
Dave Lane liked Greg Marshall's photo
Oct 27, 2016
Greg Marshall commented on Michael Adler's photo

Veil Nebula, NGC 6992, IC 1340

"Very nice, Michael. I might suggest that while blending H-a and S-II for red, and using O-III for blue/green gives you somewhat realistic (natural) color, you can get more variation in the hue by using a more "mixed up" blend. I don't…"
Sep 28, 2016
Ian G commented on Greg Marshall's photo

Iris Nebula (NGC7023)

"Really nice! Love the dust:)"
Aug 29, 2016
Ian G liked Greg Marshall's photo
Aug 29, 2016
Greg Marshall commented on Greg Marshall's photo

Iris Nebula (NGC7023)

"Thanks, Greg & Bob."
Aug 21, 2016
Bob W commented on Greg Marshall's photo

Iris Nebula (NGC7023)

"wow amazing love it!!!!"
Aug 21, 2016
Greg Spakoski commented on Greg Marshall's photo

Iris Nebula (NGC7023)

"Nice job Greg"
Aug 20, 2016
Greg Marshall posted a photo

Iris Nebula (NGC7023)

The Iris is one of my favorite targets, although I've never been completely satisfied with my images of it. Recently, at the Oregon Star Party, I didn't have much time for imaging, but spent a couple of hours each night capturing LRGB frames. While…
Aug 19, 2016
Greg Marshall posted photos
Jun 22, 2016
Greg Marshall commented on Greg Marshall's photo


"Thanks, Russ. Since posting this I tried printing this version and find that the subtle color variation does not come through as well in a print, so I might still go with "B"."
May 19, 2016
Russ Ruggles commented on Greg Marshall's photo


"Yes I can see the difference in detail as I flash between the two versions. For me I'm torn between the apparent "natural" color scheme and the higher detail and contrast but, color being subjective I think it's dealer's…"
May 19, 2016
Greg Marshall posted photos
May 17, 2016
Greg Marshall commented on Greg Marshall's photo

Mercury Transit

"Thanks, guys. I set up everything the day before even though the forecast called for heavy cloud cover and ended up getting several long periods of sunshine."
May 10, 2016
Russ Ruggles commented on Greg Marshall's photo

Mercury Transit

"Very nice Greg. No, I was set up but with the sunrise came the fog and clouds so I got nothing but fuzzy pictures to show for my efforts."
May 10, 2016

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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 (6 comments)

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At 8:20am on May 9, 2015, Bob W said…

I love that scope, I like wide field imaging and these fields are flat. The images I have are with a QSI690, you can see my images on my Astrobin page.

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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