M13 (Trace) - AstroBin

M13

This image of M13 was meant to be a test shot, but the results were nice and I wanted to publish as a small milestone in my progress.

Although shot under light polluted skies and under bright moon light from my backyard, it is the 1st image with the new TPO RC8 that I can say I'm really pleased with. The red giant star HD 150998 which I love to see in M13 images is outside the top of the frame. Again, this was planned only to be a test shot, and good framing got left out.

I commented in my previous image (M3 - first published image using the new RC) that I was not sure about the collimation on the scope. Thanks to Chris Strobel, who recommended I perform a star-test (DSI on-axis+balanced method), I found the scope was definitely NOT well collimated. The DSI method was easy and gave results real-time as I watched in the camera Live-view and adjusted both the primary and secondary mirrors. The DSI method instructs to take star images and make adjustments based on those images. However, if you have Live-view on your camera, the collimation can be done real-time. This live "collimate while you watch star results" was great and I'm very glad to have it in my bag of tricks. Again, thank you Chris!

Contrary to good diagnostics, I also added an Astromania 2" Field Flattener in the image train for this image. I wish I hadn't. Now I'll need to take another image without the FF to see if it's needed. This image was cropped slightly, and even with the FF installed there was still some stretched stars at the edges, albeit they were balanced (all pointing towards the center) because of the DSI balancing process.

The OSC Club (One Shot Camera)
Unmodified DSLR Deep Sky
DSLR/Mirrorless Imagers from the World

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Status	Advanced success
Started	...
Astrometry.net job	4541114
PixInsight job	RSY9G1USE1CLAST82DXULFKVLS8Y4INS
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h41m40s.361
RA (top/left)	16h42m49s.598
RA (top/right)	16h42m50s.697
RA (bottom/right)	16h40m30s.396
RA (bottom/left)	16h40m30s.606

Dec (center)	+36°27′55″.96
Dec (top/left)	+36°06′51″.26
Dec (top/right)	+36°48′56″.62
Dec (bottom/right)	+36°49′00″.50
Dec (bottom/left)	+36°06′53″.79

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