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Pages: 1 | 2 | (show all) Mike7Mak Pooh-Bah Reged: 12/07/11 Loc: New York Re: Very strange problem with meade dsi 2 pro [Re: astrovienna]       #5664168 - 02/05/13 07:00 PM Edit   Reply   Quote Quick Reply   I certainly agree with 'ain't broke don't fix' and if something works it works. There's so many variables involved with guiding it's near impossible to make any universal rules, especially as you say, with 'mid-range' mounts (which I think is being kind to the LX200). It wasn't until I ran PemPro that I was able to go beyond 2 seconds. Before that the PE was so ragged it made seeing the least of my problems. Post Extras:       korborh professor emeritus Reged: 01/29/11 Re: Very strange problem with meade dsi 2 pro [Re: astrovienna]       #5664416 - 02/05/13 10:13 PM Edit   Reply   Quote Quick Reply   I just checked my DSI 2 pro downloads and I see no difference between MaximDL subframe and full-frame. They are both almost instantaneous download. So 1.3sec seems odd, unless it is running in USB1 mode. Post Extras:       astrovienna Pooh-Bah Reged: 12/04/06 Loc: The NoVa White Zone Re: Very strange problem with meade dsi 2 pro [Re: korborh]       #5664454 - 02/05/13 10:51 PM Edit   Reply   Quote Quick Reply   Quote: I just checked my DSI 2 pro downloads and I see no difference between MaximDL subframe and full-frame. They are both almost instantaneous download. So 1.3sec seems odd, unless it is running in USB1 mode. Does it show you how much time elapses between data points? Post Extras:       korborh professor emeritus Reged: 01/29/11 Re: Very strange problem with meade dsi 2 pro [Re: astrovienna]       #5664495 - 02/05/13 11:33 PM Edit   Reply   Quote Quick Reply   Plotted data points for 1s exposures are ~3s apart. So there is an annoying latency which I always had and not sure where its coming from. My mount is very forgiving though and so this is not an issue for me. Before getting the dsi 2 pro I was planning to get a video camera for guiding with reduced latency, but deferred the idea until I decide to so planetary imaging. Post Extras:       jgraham Postmaster Reged: 12/02/04 Loc: Dayton, Ohio Re: Very strange problem with meade dsi 2 pro [Re: korborh]       #5665162 - 02/06/13 12:35 PM Edit   Reply   Quote Quick Reply   I've used a DSI Pro I, II, and III as well as the DSI III to guide an LXD75 and an Atlas EQ-G. I've also used a guidescope and an off-axis guider. The vast majority of the time I use 1 second exposures. I never use anything shorter, but I have gone as long as 5 seconds. I never paid much attention to the download times. Post Extras:       astrovienna Pooh-Bah Reged: 12/04/06 Loc: The NoVa White Zone Re: Very strange problem with meade dsi 2 pro [Re: korborh]       #5665216 - 02/06/13 01:04 PM Edit   Reply   Quote Quick Reply   Quote: Plotted data points for 1s exposures are ~3s apart. So there is an annoying latency which I always had and not sure where its coming from. Well, darn. I was hoping you were getting rapid downloads, meaning that I might be able to as well. I suppose what I really should do is buckle down and do some controlled tests to compare the Flea3 and DSI. But testing time always competes with imaging time! Kevin Post Extras:       jgraham Postmaster Reged: 12/02/04 Loc: Dayton, Ohio Re: Very strange problem with meade dsi 2 pro [Re: astrovienna]       #5665417 - 02/06/13 02:41 PM Edit   Reply   Quote Quick Reply   Hmmm, isn't the Flea3 a 12 bit streaming video camera? The DSI is a 16 bit still frame camera. It wouldn't surprise me that it would have a much slower data transfer rate. I've also done lunar and planetary imaging with my DSI's. They work okay in that role, but they are no match for dedicated lunar and planetary cameras. I've also done some limited deep sky imaging with my Imaging Source cameras and the reverse is also true. Post Extras:       neptun2 professor emeritus Reged: 03/04/07 Loc: Bulgaria Re: Very strange problem with meade dsi 2 pro [Re: jgraham]       #5665438 - 02/06/13 02:49 PM Edit   Reply   Quote Quick Reply   Interesting discussion definitely. Next time i will check PHD logs to see how much time pases between 2 corrections with 1 second exposures. During guiding i monitor the corrections size and direction at least for the first 5 minutes to see that everything is ok and i do not remember to have seen 3 seconds interval without correction. Anyway next time under the stars i will definitely check it. Post Extras:       astrovienna Pooh-Bah Reged: 12/04/06 Loc: The NoVa White Zone Re: Very strange problem with meade dsi 2 pro [Re: neptun2]       #5665946 - 02/06/13 08:11 PM Edit   Reply   Quote Quick Reply   Yeah, there's definitely a reason the Lodestar costs $650. Same chip as the DSI 2, but with fast downloads (0.1 second from what I hear). Neptun2, PHD actually saves all your logs in your Documents folder, so you may not need to wait for a clear night. Post Extras:       korborh professor emeritus Reged: 01/29/11 Re: Very strange problem with meade dsi 2 pro [Re: astrovienna]       #5666051 - 02/06/13 09:29 PM Edit   Reply   Quote Quick Reply   Well the download from my DSI 2 pro seems to be quite fast, a fraction of a second. However, guide corrections have much higher latency. I would think Metaguide with video camera will not have this latency. Not sure if it the camera or Maxim. Post Extras:       astrovienna Pooh-Bah Reged: 12/04/06 Loc: The NoVa White Zone Re: Very strange problem with meade dsi 2 pro [Re: korborh]       #5666207 - 02/06/13 11:00 PM Edit   Reply   Quote Quick Reply   I get the same latency with PHD, so I think it's the camera. Too bad - the DSI really is an excellent guide cam otherwise, and it's a lot cheaper than a Lodestar (especially when I already own one!) Metaguide certainly has very low latency, but I think any guide program would have that with video cams. Kevin Post Extras:       neptun2 professor emeritus Reged: 03/04/07 Loc: Bulgaria Re: Very strange problem with meade dsi 2 pro [Re: astrovienna]       #5666464 - 02/07/13 05:19 AM Edit   Reply   Quote Quick Reply   Well i did not know that PHD stores log file in My documents by default. Thank you for pointing that to me. Well from the log it looks like you are correct. Here is part of the log: Tue Feb 05 01:32:26 2013 Dir = 1, Dur = 20 Tue Feb 05 01:32:29 2013 Dir = 2, Dur = 79 Tue Feb 05 01:32:32 2013 Dir = 2, Dur = 33 Tue Feb 05 01:32:35 2013 Dir = 2, Dur = 79 Tue Feb 05 01:32:38 2013 Dir = 3, Dur = 233 So it really looks like there is such latency. Well as far as it guides well i am not worried about this but it is interesting fact anyway. Post Extras:       Pages: 1 | 2 | (show all)

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