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Re: APCC Meridian Limits Videos On New Site
There are a few more recent videos on my Sirius Imaging channel:
toggle quoted messageShow quoted text
https://www.youtube.com/channel/UCWGqhOYCVEa6D9iqYpqyYag -Ray Gralak Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc Author of PEMPro V3: https://www.ccdware.com Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver
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Re: APCC Meridian Limits Videos On New Site
Worsel
These are Ray Gralak's videos available from the old web site. None seem to pertain to meridian limits. That must be elsewhere.
Bryan
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Re: APCC Meridian Limits Videos On New Site
I don’t think that it was ever linked from the old site. I have asked Ray which videos are available and we will link to them from Technical Support.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847 www.astro-physics.com
From: ap-gto@... [mailto:ap-gto@...]
Sent: Sunday, March 31, 2019 10:41 AM To: ap-gto@... Subject: [ap-gto] APCC Meridian Limits Videos On New Site
Anyone know where to find these on the new site?
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APCC Meridian Limits Videos On New Site
dvuolhhr6nx4a532a3phnju3zs6lzvlgxdl2wzaf@...
Anyone know where to find these on the new site?
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Re: FujiFilm XT3 adapter
Stuart Heggie <stuart.j.heggie@...>
Well, you'll need some kind of adapter anyway and it is likely that a commercial adapter that allows Nikkor lenses as well as connecting to the telescope will be a) cheaper and b) have utility beyond astronomy. Seems worth considering since you said this was your daytime camera not a camera bought and modified to only be an astro camera. Stuart Heggie
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Re: FujiFilm XT3 adapter
Mike Shade
Thanks...I was contemplating this but thought I would check and see if someone else had done what I am proposing and how they did it...I know there can be some spacing concerns with the FF. It is setup properly for the Nikon...Yes it is a mirrorless camera, the Fuji.
Mike J. Shade: mshade@q.com Mike J. Shade Photography: mshadephotography.com In War: Resolution In Defeat: Defiance In Victory: Magnanimity In Peace: Goodwill Sir Winston Churchill Already, in the gathering dusk, a few of the stars are turning on their lights. Vega, the brightest one, is now dropping towards the west. Can it be half a year since I watched her April rising in the east? Low in the southwest Antares blinks a sad farwell to fall... Leslie Peltier, Starlight Nights International Dark Sky Association: <http://www.darksky.org/> www.darksky.org From: ap-gto@... [mailto:ap-gto@...] Sent: Sunday, March 31, 2019 7:12 AM To: ap-gto@... Subject: Re: [ap-gto] FujiFilm XT3 adapter Mike, I have not done this but it seems to me there should be an adapter to use Nikkor lenses on the Fuji camera. If there is, you can put that on the camera body then it would attach just like your Nikon camera did. Possibly with no change in spacers. Is the Fuji camera mirrorless? If so you probably have the back-focus for the adapter to fit without spacers. Stuart Heggie http://www.stuartheggie.com/featured.html <http://www.stuartheggie.com> On Sun, 31 Mar 2019 at 10:04, 'Mike Shade' mshade@q.com [ap-gto] <ap-gto@...> wrote: Have completely changed terrestrial cameras from Nikon to FujiFilm XT3. Curious if there is a reasonably easy way to attach this camera to my AP filed flattener for use in my 130...I have everything plumbed for Nikon, of course but see nothing for Fuji X-mounts...anyone done similar? Thanks. Mike J. Shade: mshade@q.com Mike J. Shade Photography: mshadephotography.com In War: Resolution In Defeat: Defiance In Victory: Magnanimity In Peace: Goodwill Sir Winston Churchill Already, in the gathering dusk, a few of the stars are turning on their lights. Vega, the brightest one, is now dropping towards the west. Can it be half a year since I watched her April rising in the east? Low in the southwest Antares blinks a sad farwell to fall... Leslie Peltier, Starlight Nights International Dark Sky Association: www.darksky.org <http://www.darksky.org/>
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Re: FujiFilm XT3 adapter
Stuart Heggie <stuart.j.heggie@...>
Mike, I have not done this but it seems to me there should be an adapter to use Nikkor lenses on the Fuji camera. If there is, you can put that on the camera body then it would attach just like your Nikon camera did. Possibly with no change in spacers. Is the Fuji camera mirrorless? If so you probably have the back-focus for the adapter to fit without spacers. Stuart Heggie
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FujiFilm XT3 adapter
Mike Shade
Have completely changed terrestrial cameras from Nikon to FujiFilm XT3. Curious if there is a reasonably easy way to attach this camera to my AP filed flattener for use in my 130...I have everything plumbed for Nikon, of course but see nothing for Fuji X-mounts...anyone done similar?
Thanks.
Mike J. Shade: mshade@q.com Mike J. Shade Photography:
In War: Resolution In Defeat: Defiance In Victory: Magnanimity In Peace: Goodwill Sir Winston Churchill Already, in the gathering dusk, a few of the stars are turning on their lights. Vega, the brightest one, is now dropping towards the west. Can it be half a year since I watched her April rising in the east? Low in the southwest Antares blinks a sad farwell to fall... Leslie Peltier, Starlight Nights
International Dark Sky Association: www.darksky.org
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Re: Worm mesh and PEC
Joe Zeglinski
Pawel,
Don’t forget to SAVE the current PEC curve data first.
before doing a fresh one.
You never know if your initial one, which can be restored, was better
to begin with. Would be nice if PemPro popped up a reminder to do so, or it
would just save it automatically, as a backup, even for comparison tests.
Joe Z.
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Re: Worm mesh and PEC
Pawel Lancucki
Hi Guys
Thank you for feedback. I think I will re-run PEC anyway after the worm mesh adjustment, now on the next full moon ;-) CS Pawel Lancucki
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Re: APCC Pro 1.7.1.1 Orphaned Process
Danny Flippo
Ray, I found the issue. My driver wasn't terminating a thread properly. Sorry for the false alarm.
-Dan
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Re: SDE in encoder mounts
Roland Christen
That's excellent. Similar to what i get with my 1600 AE with the 17" Astrograph in typical Midwest seeing. There have been nights that were very steady with resulting RMS guiding below 0.1 arc sec. for several hours. Normally though i get more like 0.25 - 0.3 most nights.
On our remote setup down in Chile at the Las Campanas site, our 12" astrograph mounted on a 1600 AE gets routinely 0.1 RMS guiding. Seeing down there is almost always below 0.5 arc sec.
Rolando
-----Original Message----- From: steven hoffman stevenhoffman53@... [ap-gto] To: ap-gto@... Sent: Sat, Mar 30, 2019 6:54 pm Subject: Re: [ap-gto] SDE in encoder mounts
So
glad to have 1600GTO-AE. Here is 5 hours of PHD2 guiding from last week. Notice the points plotted in the lower right hand "bullseye".
This time with the image file to the PHD2 screen shot.
From: ap-gto@... on behalf of chris1011@... [ap-gto]
Sent: Saturday, March 30, 2019 7:01 PM To: ap-gto@... Subject: [ap-gto] SDE in encoder mounts Hi Astronuts,
There is an ongoing discussion in Cloudy Nights about rapid oscillations in the RA tracking rate of encoder mounts. Yes it's real and all encoder mounts that use
relative encoders have it. It's caused by sub-divisional error and is typically about 5% or more of the fundamental line spacing. The highest resolution relative encoders have on the order
of 50 - 100 arc seconds spacing between lines. These are then interpolated electronically to provide finer line counts down to the sub-arc sec level - however with a typical error of 2.5 - 5 arc seconds. This results in a fast ripple motion in the RA tracking
rate that cannot be guided out.
Encoders that have 50 arc sec spacing will exhibit a back and forth motion in the RA tracking every 3.3 seconds. This averages out of course over a period of time so one can spec
it as an average or RMS level close to zero. These motions may not record using short and medium focal length scopes, but can easily be seen with long focus SCTs and astrographs. In fact there are videos showing a star bobbling back and forth in RA in a C11
with a video camera attached. Of course if your scope/camera combo is operating at 4 arc sec per pixel, a 3 arc sec star motion will never be detected since the light of any one star will never leave the pixel.
The good news for Astro-Physics customers is that we have always used Renishaw Resolute Absolute encoders, which use a different method for achieving high resolution. We chose Renishaw
precisely because they have no detectable SDE. The encoder ring accuracies are certified by Renishaw using laboratory standards. The encoder readheads use a very unique and accurate method to determine any one of 67 million (2^26) individual positions around
the 360 degree encoder ring. The readheads have 20 times lower sub-divisional error than any relative encoder system. Yes, they are much more expensive than relative encoders, but they produce the accuracy needed for real precise tracking in an astronomical
mount.
Roland Christen
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Re: SDE in encoder mounts
steven ho
So
glad to have 1600GTO-AE. Here is 5 hours of PHD2 guiding from last week. Notice the points plotted in the lower right hand "bullseye".
This time with the image file to the PHD2 screen shot.
From: ap-gto@... on behalf of chris1011@... [ap-gto]
Sent: Saturday, March 30, 2019 7:01 PM To: ap-gto@... Subject: [ap-gto] SDE in encoder mounts Hi Astronuts,
There is an ongoing discussion in Cloudy Nights about rapid oscillations in the RA tracking rate of encoder mounts. Yes it's real and all encoder mounts that use
relative encoders have it. It's caused by sub-divisional error and is typically about 5% or more of the fundamental line spacing. The highest resolution relative encoders have on the order
of 50 - 100 arc seconds spacing between lines. These are then interpolated electronically to provide finer line counts down to the sub-arc sec level - however with a typical error of 2.5 - 5 arc seconds. This results in a fast ripple motion in the RA tracking
rate that cannot be guided out.
Encoders that have 50 arc sec spacing will exhibit a back and forth motion in the RA tracking every 3.3 seconds. This averages out of course over a period of time so one can spec
it as an average or RMS level close to zero. These motions may not record using short and medium focal length scopes, but can easily be seen with long focus SCTs and astrographs. In fact there are videos showing a star bobbling back and forth in RA in a C11
with a video camera attached. Of course if your scope/camera combo is operating at 4 arc sec per pixel, a 3 arc sec star motion will never be detected since the light of any one star will never leave the pixel.
The good news for Astro-Physics customers is that we have always used Renishaw Resolute Absolute encoders, which use a different method for achieving high resolution. We chose Renishaw
precisely because they have no detectable SDE. The encoder ring accuracies are certified by Renishaw using laboratory standards. The encoder readheads use a very unique and accurate method to determine any one of 67 million (2^26) individual positions around
the 360 degree encoder ring. The readheads have 20 times lower sub-divisional error than any relative encoder system. Yes, they are much more expensive than relative encoders, but they produce the accuracy needed for real precise tracking in an astronomical
mount.
Roland Christen
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New file uploaded to ap-gto
ap-gto@...
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the ap-gto group. File : /phd2_4.PNG Uploaded by : sink45ny <stevenhoffman53@...> Description : 5 hours of guiding with 1600GTO-AE You can access this file at the URL: https://groups.yahoo.com/neo/groups/ap-gto/files/phd2_4.PNG To learn more about file sharing for your group, please visit: https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398 Regards, sink45ny <stevenhoffman53@...>
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Re: SDE in encoder mounts
steven ho
So glad to have 1600GTO-AE. Here is 5 hours of PHD2 guiding from last week. Notice the points plotted in the lower right hand "bullseye".
[cid:fe980320-70c8-47b3-9787-626b73aa60be] ________________________________ From: ap-gto@... <ap-gto@...> on behalf of chris1011@... [ap-gto] <ap-gto@...> Sent: Saturday, March 30, 2019 7:01 PM To: ap-gto@... Subject: [ap-gto] SDE in encoder mounts Hi Astronuts, There is an ongoing discussion in Cloudy Nights about rapid oscillations in the RA tracking rate of encoder mounts. Yes it's real and all encoder mounts that use relative encoders have it. It's caused by sub-divisional error and is typically about 5% or more of the fundamental line spacing. The highest resolution relative encoders have on the order of 50 - 100 arc seconds spacing between lines. These are then interpolated electronically to provide finer line counts down to the sub-arc sec level - however with a typical error of 2.5 - 5 arc seconds. This results in a fast ripple motion in the RA tracking rate that cannot be guided out. Encoders that have 50 arc sec spacing will exhibit a back and forth motion in the RA tracking every 3.3 seconds. This averages out of course over a period of time so one can spec it as an average or RMS level close to zero. These motions may not record using short and medium focal length scopes, but can easily be seen with long focus SCTs and astrographs. In fact there are videos showing a star bobbling back and forth in RA in a C11 with a video camera attached. Of course if your scope/camera combo is operating at 4 arc sec per pixel, a 3 arc sec star motion will never be detected since the light of any one star will never leave the pixel. The good news for Astro-Physics customers is that we have always used Renishaw Resolute Absolute encoders, which use a different method for achieving high resolution. We chose Renishaw precisely because they have no detectable SDE. The encoder ring accuracies are certified by Renishaw using laboratory standards. The encoder readheads use a very unique and accurate method to determine any one of 67 million (2^26) individual positions around the 360 degree encoder ring. The readheads have 20 times lower sub-divisional error than any relative encoder system. Yes, they are much more expensive than relative encoders, but they produce the accuracy needed for real precise tracking in an astronomical mount. Roland Christen
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Re: SDE in encoder mounts
Cheng-Yang Tan
Hi Rolando, Thanks for the info! cytan
On Saturday, March 30, 2019, 6:01:27 PM CDT, chris1011@... [ap-gto] wrote:
Hi Astronuts,
There is an ongoing discussion in Cloudy Nights about rapid oscillations in the RA tracking rate of encoder mounts. Yes it's real and all encoder mounts that use relative encoders have it. It's caused by sub-divisional error and is typically about 5% or more of the fundamental line spacing. The highest resolution relative encoders have on the order of 50 - 100 arc seconds spacing between lines. These are then interpolated electronically to provide finer line counts down to the sub-arc sec level - however with a typical error of 2.5 - 5 arc seconds. This results in a fast ripple motion in the RA tracking rate that cannot be guided out.
Encoders that have 50 arc sec spacing will exhibit a back and forth motion in the RA tracking every 3.3 seconds. This averages out of course over a period of time so one can spec it as an average or RMS level close to zero. These motions may not record using short and medium focal length scopes, but can easily be seen with long focus SCTs and astrographs. In fact there are videos showing a star bobbling back and forth in RA in a C11 with a video camera attached. Of course if your scope/camera combo is operating at 4 arc sec per pixel, a 3 arc sec star motion will never be detected since the light of any one star will never leave the pixel.
The good news for Astro-Physics customers is that we have always used Renishaw Resolute Absolute encoders, which use a different method for achieving high resolution. We chose Renishaw precisely because they have no detectable SDE. The encoder ring accuracies are certified by Renishaw using laboratory standards. The encoder readheads use a very unique and accurate method to determine any one of 67 million (2^26) individual positions around the 360 degree encoder ring. The readheads have 20 times lower sub-divisional error than any relative encoder system. Yes, they are much more expensive than relative encoders, but they produce the accuracy needed for real precise tracking in an astronomical mount.
Roland Christen
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SDE in encoder mounts
Roland Christen
Hi Astronuts,
There is an ongoing discussion in Cloudy Nights about rapid oscillations in the RA tracking rate of encoder mounts. Yes it's real and all encoder mounts that use relative encoders have it. It's caused by sub-divisional error and is typically about 5% or more of the fundamental line spacing. The highest resolution relative encoders have on the order of 50 - 100 arc seconds spacing between lines. These are then interpolated electronically to provide finer line counts down to the sub-arc sec level - however with a typical error of 2.5 - 5 arc seconds. This results in a fast ripple motion in the RA tracking rate that cannot be guided out.
Encoders that have 50 arc sec spacing will exhibit a back and forth motion in the RA tracking every 3.3 seconds. This averages out of course over a period of time so one can spec it as an average or RMS level close to zero. These motions may not record using short and medium focal length scopes, but can easily be seen with long focus SCTs and astrographs. In fact there are videos showing a star bobbling back and forth in RA in a C11 with a video camera attached. Of course if your scope/camera combo is operating at 4 arc sec per pixel, a 3 arc sec star motion will never be detected since the light of any one star will never leave the pixel.
The good news for Astro-Physics customers is that we have always used Renishaw Resolute Absolute encoders, which use a different method for achieving high resolution. We chose Renishaw precisely because they have no detectable SDE. The encoder ring accuracies are certified by Renishaw using laboratory standards. The encoder readheads use a very unique and accurate method to determine any one of 67 million (2^26) individual positions around the 360 degree encoder ring. The readheads have 20 times lower sub-divisional error than any relative encoder system. Yes, they are much more expensive than relative encoders, but they produce the accuracy needed for real precise tracking in an astronomical mount.
Roland Christen
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Re: New Astro-Physics website now live!
Joe Renzetti <axnyslie@...>
I like it well done. I hope this means you'll be looking at making a much needed upgrade to this antiquated Yahoo group platform and merge to a modern user discussion forum. That would be very helpful for us. Joe
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Re: Motor Stall detected APCC 1.7.1.1
Roland Christen
what does the motor stall notice indicate is happening? It can mean that you have bumped into the maximum slew limit, and the motors will be stopped and de-energized at that point.
Rolando
-----Original Message-----
From: lmbuck2000@... [ap-gto] To: ap-gto Sent: Sat, Mar 30, 2019 11:16 am Subject: RE: [ap-gto] Motor Stall detected APCC 1.7.1.1 thanks, Ray. i do have the latest chip (V2) for my CP3 controller as well as the GTOAE control box. i don't believe there is a later version for the CP3/AE configuration. is there something newer in the CP4 box that is required?
btw, i did see the motor stall error one time last night running the 1.7.0.1 beta (consistent with your comment about APCC).
what does the motor stall notice indicate is happening?
Lee
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Re: Motor Stall detected APCC 1.7.1.1
Hi Lee,
what does the motor stall notice indicate is happening?I think there are various causes so I don't want to speculate. You should probably give Howard at Astro-Physics a call next week to discuss the specifics of your setup. -Ray Gralak Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc Author of PEMPro V3: https://www.ccdware.com Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver -----Original Message-----
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