Search found 8 matches

by jeff2011
Thu Mar 18, 2021 2:37 pm
Forum: General Discussions
Topic: Question about our Club's Pro license
Replies: 1
Views: 224

Question about our Club's Pro license

Hello Robin, My astronomy club recently purchased the Pro license for use in our club's observatory. We do viewings for the public and have been closed since COVID started but plan to reopen using EAA instead of viewing through the eyepiece. Your license FAQ states that the license can be "inst...
by jeff2011
Thu May 21, 2020 3:23 am
Forum: Tips and Tricks
Topic: Flats and mottling pattern in final stacked image
Replies: 10
Views: 4856

Re: Flats and mottling pattern in final stacked image

I believe it is an inherent issue with that sensor Robin. It was designed as a low light sensor and does not react well to the bright light of flats with short exposures. Lots of issues reported on Cloudy Nights taking flats with that sensor, both the QHY and ZWO models. ZWO markets it more as an EA...
by jeff2011
Wed May 20, 2020 6:17 pm
Forum: Tips and Tricks
Topic: Flats and mottling pattern in final stacked image
Replies: 10
Views: 4856

Re: Flats and mottling pattern in final stacked image

I was running into this issue and a friend pointed me to this thread. 200 gain flats look promising but I still noticed a bit of mottling in the flat. I have also found that longer flat exposures also seem to reduce mottling. A 200 gain flat at 2 seconds looks indistinguishable from a zero gain flat...
by jeff2011
Sun Mar 24, 2019 3:26 am
Forum: ZWO Cameras
Topic: Sensor Analysis ASI294c, e/ADU does not look right
Replies: 5
Views: 2176

Re: Sensor Analysis ASI294c, e/ADU does not look right

Yeah that was it. Had some trouble running the sensor analysis. I had to run it with my flat panel at full brightness even though it said it was dangerously close to the minimum exposure, but if I dimmed it seemed to get in an infinite loop when doing the last run of the analysis where I have to put...
by jeff2011
Sat Mar 23, 2019 4:10 pm
Forum: ZWO Cameras
Topic: Sensor Analysis ASI294c, e/ADU does not look right
Replies: 5
Views: 2176

Re: Sensor Analysis ASI294c, e/ADU does not look right

I will give that a try. After posting I realized there was a new version and was headed in that direction. Thanks for your explanation.

Jeff
by jeff2011
Sat Mar 23, 2019 4:41 am
Forum: ZWO Cameras
Topic: Sensor Analysis ASI294c, e/ADU does not look right
Replies: 5
Views: 2176

Sensor Analysis ASI294c, e/ADU does not look right

I ran a sensor analysis on my ASI294c and got the following results. The read noise, full well and dynamic range match up reasonably well with the charts on the ZWO site for this camera but the e/ADU does not. I am reading something wrong. Unity gain should be at 117. I am running version 3.1.5220.0...
by jeff2011
Mon Jun 11, 2018 12:41 am
Forum: How do I?
Topic: Flat Frames Capture - impact of Dark Frames
Replies: 5
Views: 1869

Re: Flat Frames Capture - impact of Dark Frames

Hello Robin, Your view is correct that the offset is the most important thing to correct in the flat but there are a few things to consider. When taking narrow band flats it is not uncommon for me to take flats that are 20 seconds. My first generation ASI1600 mono has issues with flats between 5 and...
by jeff2011
Sun Jun 10, 2018 4:28 pm
Forum: How do I?
Topic: Flat Frames Capture - impact of Dark Frames
Replies: 5
Views: 1869

Re: Flat Frames Capture - impact of Dark Frames

Was about to post a question about calibrating flats and found this thread. In addition to the bias option, but be nice to be able to apply dark subtraction to flats. That is you could change your validation to a warning and then apply the darks selected to the flats. Would have to remember to chang...