Search found 829 matches

by oopfan
Mon Aug 14, 2017 12:43 pm
Forum: Scripting
Topic: Helpful IronPython libraries
Replies: 19
Views: 3810

Re: Helpful IronPython libraries

Hi Robin, I think that you mentioned that the documentation of the "SharpCap.ImageProcessing" assembly is a work-in-progress. Do you know if there is anything in there that would allow me to stretch an image? Hopefully that will give OpenCVStarDetector more meat to sink its teeth into. Tha...
by oopfan
Mon Aug 14, 2017 4:53 am
Forum: Scripting
Topic: Helpful IronPython libraries
Replies: 19
Views: 3810

Re: Helpful IronPython libraries

Hi Robin, I've developed a number of useful scripts based on calls to OpenCVStarDetector. The problem I am having is that it is not very sensitive at all. I can send you snapshots but I can summarize by saying that I clearly see 7 stars but it struggles to find 3 maybe 4 if it is lucky. Here is how ...
by oopfan
Mon Aug 14, 2017 12:21 am
Forum: Polar Alignment
Topic: Helpful tip
Replies: 7
Views: 2511

Re: Helpful tip

Let me take that back... If using your finderscope at 175mm focal length works then use it! You will save the cost of the focal reducer. The focal reducer will make your 400mm scope into 200mm. There isn't much difference between 175 and 200, plus you will get a slightly wider field of view at 175mm...
by oopfan
Sun Aug 13, 2017 4:56 pm
Forum: Polar Alignment
Topic: Helpful tip
Replies: 7
Views: 2511

Re: Helpful tip

I would suggest getting the 0.5x focal reducer.
by oopfan
Sun Aug 13, 2017 12:52 pm
Forum: Polar Alignment
Topic: Slow response
Replies: 11
Views: 3364

Re: Slow response

My winning combination is: 1. 400mm scope with 0.5x focal reducer yields 1.7 degrees on the diagonal of my ASI120MC 2. 2sec exposure 100 gain with dark frame subtraction 3. Minimum star width: 4 pixels 4. Wait until beginning of astronomical twilight (Sun is 12 deg below horizon) Within 20 minutes I...
by oopfan
Thu Aug 10, 2017 2:16 pm
Forum: Implemented Features
Topic: Reticule Readout
Replies: 0
Views: 1253

Reticule Readout

Reticule is a nice feature but it would be great if I could get a readout of the angle of the crosshairs. I need +/-180 degrees. It should change whenever I right-click on the image.
by oopfan
Fri Aug 04, 2017 12:59 pm
Forum: Deep Sky Imaging
Topic: Optimum ratio of dark frames to light frames?
Replies: 2
Views: 1518

Re: Optimum ratio of dark frames to light frames?

Hi Robin, Thanks for all your help. I dug around on the web and found some useful information at the DSS website. I could be wrong but my takeaway was that you can never have too many darks! Well I allowed that to bounce around in my empty skull for a while, and then I came to the frightening realiz...
by oopfan
Thu Aug 03, 2017 11:31 pm
Forum: Deep Sky Imaging
Topic: Optimum ratio of dark frames to light frames?
Replies: 2
Views: 1518

Optimum ratio of dark frames to light frames?

Robin, When I launch the dialog to begin dark frame acquisition it defaults to 10 frames. I have always wondered if there is a magic ratio of darks to lights that achieve the best result. My gut tells me that if I aim to only collect 100 lights then 10 darks are acceptable, but if my goal is to coll...
by oopfan
Thu Aug 03, 2017 11:23 pm
Forum: Not Currently Planned
Topic: L0 = L1 + D
Replies: 2
Views: 1728

L0 = L1 + D

Robin, I made a major blunder by reusing darks that were acquired the previous night at a cooler sensor temperature. The result is that my newly acquired lights, with dark frame subtraction turned on, have lots of hot pixels shining through. Is there a way to get SC to perform the inverse of dark fr...
by oopfan
Wed Aug 02, 2017 3:22 pm
Forum: Gallery
Topic: NGC 7331
Replies: 3
Views: 1410

Re: NGC 7331

Hmm, yes, I think I might back down to 90 sec subs. I looked back at my camera settings file for the darks and compared it to the lights. The darks were captured at 12.5C and the lights at 13.2C. To me with my limited experience that is not a huge difference. So I think that 120 sec subs are out, an...