Search found 14 matches

by RickEvans10473
Thu Jul 28, 2022 12:23 am
Forum: Deep Sky Imaging
Topic: Did I accidently mis-set something?
Replies: 1
Views: 1011

Re: Did I accidently mis-set something?

Tried without success to reproduce the condition. For now I'll chalk it up to a one off glitch.
by RickEvans10473
Wed Jul 27, 2022 4:35 pm
Forum: Deep Sky Imaging
Topic: Did I accidently mis-set something?
Replies: 1
Views: 1011

Did I accidently mis-set something?

Last night while imaging some star clusters, fortunately on 15s subs, Sharpcap would randomly grey-out for first 5 to 10 subs before starting saving subs. This is the first time in many dozens of sessions I've seen this. Thanks in advance for any help/tips.
by RickEvans10473
Sat Jul 10, 2021 4:18 pm
Forum: Announcements
Topic: Advance Warning - SharpCap Pro prices will rise on 1st July
Replies: 5
Views: 7208

Re: Advance Warning - SharpCap Pro prices will rise on 1st July

Hi Robin,
If you upgrade from 3.x to 4 before current license expires does the license transfer with the same expiration date?
by RickEvans10473
Sat Oct 03, 2020 1:55 pm
Forum: Gallery
Topic: M31 Andromeda core globular clusters map
Replies: 6
Views: 1803

Re: M31 Andromeda core globular clusters map

Wow. Very impressive. I will be looking at my own M31 core image to see how many globulars I might have picked up.
by RickEvans10473
Sun Aug 26, 2018 10:00 pm
Forum: Deep Sky Imaging
Topic: Artifacts with dark frame subtraction
Replies: 20
Views: 9291

Re: Artifacts with dark frame subtraction

Hi Robin, As promised I tested dark frame subtraction using the Raw16 color space and there were no artifacts. I have not had a chance to play with the live flat frame subtraction but did use SharpCap to generate. I have a few questions about version 3.2. I see it's beta and expires on September 30....
by RickEvans10473
Thu Aug 23, 2018 1:47 pm
Forum: Deep Sky Imaging
Topic: Artifacts with dark frame subtraction
Replies: 20
Views: 9291

Update Re: Artifacts with dark frame subtraction

Hi Robin, For the first time since since last posting I got a clear, albeit moon lit, night here in the US Mid Atlantic States. I was able to test the dark frame subtraction on M13 and M27 in RGB24 mode using Version 3.2 The good news is there were no artifacts when using Version 3.2 .To be sure I u...
by RickEvans10473
Thu Aug 16, 2018 3:33 pm
Forum: Deep Sky Imaging
Topic: Artifacts with dark frame subtraction
Replies: 20
Views: 9291

Re: Artifacts with dark frame subtraction

"Hi, please retest with 3.2.5696 when you have a chance - I have made significant changes to the dark subtraction code that I think will reduce or eliminate this type of artifact. There are a lot of different cases to cover in the dark subtraction, so I hope I (a) found them all and (b) changed...
by RickEvans10473
Wed Aug 15, 2018 1:57 pm
Forum: Deep Sky Imaging
Topic: Artifacts with dark frame subtraction
Replies: 20
Views: 9291

Re: Artifacts with dark frame subtraction

Hi Brian, "It appears that the artifacts are only happening on the brightest stars. Perhaps the camera's pixel scale and the telescope's focal length have led to severe undersampling. SC could be misinterpreting stars as hot pixels. The pixel size is 4.63 um so if the telescope is relatively sh...
by RickEvans10473
Wed Aug 15, 2018 3:10 am
Forum: Deep Sky Imaging
Topic: Artifacts with dark frame subtraction
Replies: 20
Views: 9291

Re: Artifacts with dark frame subtraction

Un-subtracted light frame
M092_00001.png
M092_00001.png (519.13 KiB) Viewed 4216 times
by RickEvans10473
Wed Aug 15, 2018 3:07 am
Forum: Deep Sky Imaging
Topic: Artifacts with dark frame subtraction
Replies: 20
Views: 9291

Re: Artifacts with dark frame subtraction

Hi Robin

You asked: "do you have a copy of the dark frame that you were using and an unsubtracted light frame that you can share?"

Dark Frame
dark_10_frames_0.0C_2018-08-09T00_23_04_5555.png
dark_10_frames_0.0C_2018-08-09T00_23_04_5555.png (867.83 KiB) Viewed 4216 times