Search found 55 matches

by TimHaymes
Mon Apr 15, 2024 11:04 pm
Forum: QHY Cameras
Topic: QHY174mGPS wrong exposure interval.
Replies: 7
Views: 433

Re: QHY174mGPS wrong exposure interval.

Hi Jean-Francois, You wrote: The exposure value is not taken if no "Return" is press or when the keyboard "|" is still in the exposure input field. Yes, i have also encountered this. In one case it was set to 100ms, but i changed it to 80ms (or so I thought) but the exposure was ...
by TimHaymes
Thu Apr 11, 2024 9:46 am
Forum: QHY Cameras
Topic: QHY174mGPS wrong exposure interval.
Replies: 7
Views: 433

Re: QHY174mGPS wrong exposure interval.

Hi Robin,

A possible consequence, is that the exposure was 65ms, but with a delay between frames of 123ms. Is this possible?
Not that it effects the final occultation timing, only the SNR.

Tim
by TimHaymes
Thu Apr 11, 2024 9:17 am
Forum: QHY Cameras
Topic: QHY174mGPS wrong exposure interval.
Replies: 7
Views: 433

Re: QHY174mGPS wrong exposure interval.

Thanks very much Robin for the analysis. A poor USB connection is quite likely ! The connection is USB3 to a USB3 port on the laptop. The cable run doesnt normally create a problem, but i have the original 1.5m cable connected to an "active" (non-powered) 3m USB3 extension. However this is...
by TimHaymes
Wed Apr 10, 2024 1:05 pm
Forum: QHY Cameras
Topic: QHY174mGPS wrong exposure interval.
Replies: 7
Views: 433

QHY174mGPS wrong exposure interval.

Hi / I recorded an occultation last night (SC 4.1.11786 as ADV bin2x2). The exposure was set to 50ms, i then changed that to 65ms. The Camera log file says 65ms. All well so far, but the adv is recorded with an interval of 0.188s ! At 00:31:00.169227 - The log file also says 639 frames captured at 5...
by TimHaymes
Mon Feb 19, 2024 5:57 pm
Forum: ZWO Cameras
Topic: ASI174 used for occultations - timeing ?
Replies: 2
Views: 329

Re: ASI174 used for occultations - timeing ?

Thank-you Robin
Tim
by TimHaymes
Sun Feb 18, 2024 1:06 pm
Forum: ZWO Cameras
Topic: ASI174 used for occultations - timeing ?
Replies: 2
Views: 329

ASI174 used for occultations - timeing ?

Hi Robin/All, If i use this camera and Tangra for determining an occultation (mid-frame) time, and i have V 4.1.1x... Do i select "end of frame" time setting in Tangra ? The time stamp is applied by the computer clock in this case. I ask the question because im not sure if the SER time sta...
by TimHaymes
Wed Jan 31, 2024 3:02 pm
Forum: General Discussions
Topic: Log File housekeeping ?
Replies: 1
Views: 354

Log File housekeeping ?

Hi Robin, I dont have many log-files in 2023. The last one was 2023-12-02. My question is whether or not old files are deleted by SharpCap? If so, is there way to increase that time period, or should I copy them by hand? Why you ask? Well It occurred to me that this a record of telescope usage over ...
by TimHaymes
Mon Nov 27, 2023 10:02 am
Forum: Deep Sky Imaging
Topic: Excessive Star Glow
Replies: 9
Views: 6861

Re: Excessive Star Glow

Old lenses will have these aberrations. Its accentuated by high(er) resolution CCDs. You could stop down, and this should sharpen up the image. I see the same problem on Canon-L lenses at full aperture on a 60Da, since they are not corrected for the IR or deep red (e,g Ha). So I take extra care with...
by TimHaymes
Thu Mar 23, 2023 12:40 pm
Forum: General Discussions
Topic: What's the difference between polar alignment and plate solving?
Replies: 6
Views: 1157

Re: What's the difference between polar alignment and plate solving?

Hi Alexw, Sorry, I miss-informed you about sharpcap not using plate solve in the polar axis routine. Thanks for the clarification/reminder Robin! Alexw replied to me (i think) : "So you're saying tracking during an exposure DOESN'T use plate solving, it just bumps your axis based on the displac...
by TimHaymes
Wed Mar 22, 2023 11:34 am
Forum: General Discussions
Topic: What's the difference between polar alignment and plate solving?
Replies: 6
Views: 1157

Re: What's the difference between polar alignment and plate solving?

Hi Alex, The polar axis alignment is fixed at the time you set up the mount. This is not always exact. SharpCap has a tool that enables you adjust the mount by using a camera on the finder. This is partly manual and doesn't use any plate solving. Its a physical adjustment. I check the polar alignmen...