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Greg Marshall
- Male
- United States
- Blog Posts (15)
- Discussions (31)
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- Groups (1)
- Photos (117)
- Photo Albums (6)
Greg Marshall's Discussions
Narrowband Filter Choice
Started this discussion. Last reply by Greg Marshall Feb 1, 2013. 2 Replies 0 Likes
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 0 Likes
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
Greg Marshall's Page
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Greg Marshall's Photos
Greg Marshall's Blog
Welcome Back, Neal
Posted on June 16, 2015 at 9:10pm 0 Comments 0 Likes
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…
ContinueFocus Motor for SCT
Posted on December 26, 2013 at 12:57pm 0 Comments 0 Likes
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…
Continue2014 Calendar of Astro-Photos
Posted on November 6, 2013 at 12:13am 0 Comments 0 Likes
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:…
ContinuePerfectStar Focus Controller and Motor
Posted on April 21, 2013 at 10:20pm 0 Comments 0 Likes
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 http://wa-chur-ed.com/.…
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sono veramente ammirato per il tuo lavoro, complimenti. c.colombo astrofilo milanese
Carlos, please go to the contact page of my web site: http://wa-chur-ed.com/page5.html. The address is there in an encrypted form.
Thanks,
Greg
Greg, I need a motor focus for my AT111 - I liked what you had up at the imaging conference.
Dennis