Re: [ap-ug] M5 - the lonesome Globular

Jeff B

Pretty cool Roland.

Your image picks up on my visual impression that M5 has a very bright and "intense" core.


On Fri, Jun 25, 2021 at 3:26 PM Roland Christen via <> wrote:
This particular camera came with a front adapter that is not quite large enough ID to fully illuminate the corners. I did not bother to take a flat, but it is definitely needed. There is approximately 5% light fall-off in the very corners due to this restriction. That's not a huge amount and can be handled by a flat frame. (see image below)


-----Original Message-----
From: AaronW <aaron.wilhelm@...>
Sent: Fri, Jun 25, 2021 1:14 pm
Subject: Re: [ap-ug] M5 - the lonesome Globular


I am also quite interested in the 6200 and how it works with refractors in the 130mm range.  I have a William Optics Fluorostar 132mm refractor that is advertised as fully illuminating a full frame sensor (such as the 6200), but I have heard several reports of terrible corner stars and severe vignetting (the kind that flats cannot fix) when paired with this particular scope from WO.  Did you have any trouble fully illuminating the full frame of the 6200?


On Jun 25, 2021, at 8:39 PM, Roland Christen via <> wrote:

Hi Astronuts,

While trying out the new ZWO 6200 MC Pro color camera that George graciously lent me, I was rummaging around the early evening sky trying to find something bright and colorful to image. There really isn't much available between the rich galaxy swarms of Spring and the later Milky Way treasures of Summer. I spotted this Glob sitting all by itself in what seems like empty space, at least so it seems from my light polluted site.

The real reason for shooting with this camera was to check out the spacing requirements of our Quad TCC and the 130 GTX refractor. I was also interested to see what kind of resolution to expect using the tiny 3.75 micron pixel CMOS chip with a mere 655mm focal length and 130mm aperture. So, without further ado, here she be:

The image had to be cropped from the full size in order to upload it to Astrobin. Full size color image is an insane amount of mega-pookles.


Roland Christen

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