The Coma Star Cluster (William Maxwell)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: NGC 4565 · NGC 4631 · Needle Galaxy · The star 12Com · The star 13Com · The star 14Com · The star 16Com · The star 17Com · The star 18Com · The star 23Com · The star 26Com · The star 7Com · The star γCom · Whale Galaxy

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The Coma Star Cluster

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The Coma Star Cluster

I'm a big fan of larger sensors, but they tend to cost a zillion dollars. For years I didn't use my Canon 5D (classic) due to amp glow, then I remembered dark frames..which cured the problem. The older 5D doesn't have the pixel count, but the larger pixels really improved the dynamic range (the lower 800 iso helped) keeping much of the star color.

So here is my first go with a full frame. I'm hoping it will be a nice plus to the 135mm fl wider field shots, rather like using a wide field eyepiece that still has a fair amount of zoom.

Speaking of the 135mm lens. I must say I'm rather impressed with the resolution. The stars remained pinpoints all the way to the edge with the full frame sensor even with the lens wide open.

I also debuted my Onstep build for this setup. It was a steep learning curve and I am still by no means an electronics person, but once I got a formula worked out (with generous help from the forum) I just kept building the things. Pretty much all my mounts now have GoTo which in this case is really good since finding motors for these older Polaris mounts is nearly impossible.

Cloudy Nights

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
Started	...
Astrometry.net job	4474226
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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The Coma Star Cluster

The Coma Star Cluster

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The Coma Star Cluster

The Coma Star Cluster

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