Stephen thanked Keith Cobby in topic Reasonable Align Accuracy for CGEM 6 hours 27 minutes ago
Keith Cobby replied to the topic 'Reasonable Align Accuracy for CGEM' in the forum. 2 days ago

Just a thought; is your FOV correct for your scope and camera combination?

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Keith Cobby replied to the topic 'Trouble Connecting ZWO/ASI EFW Wheel' in the forum. 3 days ago

Add

sudo apt-get indi-full
sudo apt-get gsc

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Keith Cobby replied to the topic 'Trouble Connecting ZWO/ASI EFW Wheel' in the forum. 4 days ago

Are you using KStars install from Ubuntu repo or from the PPA? The latter being the suggested source. If you're sing a single RPi I presume you are using a power USB hub (this can work wonders).

I use the EFW7 and an ASI120MM with my ASI1600MM-C. The EFW and ASI120MM use short USB cables, both into the ASI1600MM-C hub which in turn uses a single USB cable into my RPi3.

I'm not sure if you can use the indi_asi_wheel driver for the EFW with a simulated camera, I could be wrong.

Have you tried the EFW Initialization Tool found under the SDK Tab of the Software page. I'm not sure what it does but maybe it will help.

[url=https://astronomy-imaging-camera.com/software/[/url]

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Keith Cobby replied to the topic 'Reasonable Align Accuracy for CGEM' in the forum. 4 days ago

I presume your setup is not permanent and therefore when you setup before each session you are assembling the tripod, mount and scope. Having witnessed a CGEM being set up and used, guiding is noticeably better when time is spent on mechanical polar alignment i.e. level tripod and accurate inclination (altimuth). What KStars offers, with its Polar Alignment Assistant, is a precision RA alignment. Get that spot-on and your guiding performance will improve with less pulses and possibly little if any DEC movement. Precise polar alignment will also allow you to accurately model/expose your mechanical errors, if any. Using the Polar Alignment assistant will give you the confidence enjoyed by owners of permanently mounted rigs.

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Keith Cobby replied to the topic 'Reasonable Align Accuracy for CGEM' in the forum. 5 days ago

The plate solver works very well with an image containing distinctive stars. In my experience it doesn't like solving around the NCP, nor deep inside the Milky Way, nor does it like globular clusters. I tend to slew East to somewhere around 45 degrees for my first solve, then another two on the same side in a triangle from the first. Once the scopes starts to be more accurate I delete the earlier solves (the one's not centered in the plot graph) and continue with more stars until each slew is perfect.

After I've done this (which takes a handful of minutes) I will then use the Polar Alignment Assistant tool to double check my mount alignment. If it is indeed out (a major contributor to poor guiiding) I will of course manual adjust my mount using the PA Assistant (sometimes needs to be done twice) and then restart the start alignment/plate solving.

Note: If I move to other side of sky I will again solve at least another three stars, again deleting the ones that don't fall in the centre.

IMPORTANT: just in case, save the mount model as you progress.

Start to finish this is 20minutes. The most valuable 20min you'll ever spend in an all night session.

After this your guiiding can now be set up. Try it with the built in guider first and, should you prefer, PHD2 after. Both guide applications will need a few tweaks to the setup parameters (Max and Min Pulses) is where the magic happens.

Note: I frequently attend imaging evenings with a CGEM owner. He doesn't use Ekos (yet) and simply uses the hand controller to set up his two/three start alignment before using PHD2 to guide. His guiding is either great or horrid depending upon his physical polar alignment at setup. The PA Assistant is a brilliant tool and with the subsequent accuracy of polar alignment, it's your new guiding BFF.

Mount Mechanical Problems: One accurately polar aligned if you are concerned about mount error then log the Guide Data. This will produce a text file that can be exported into a spreadsheet to visualize possible mechanical errors. The guide data log gives you an insight only, you will need to use some dedicated mount software to fully evaluate mechanical errors.

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Keith Cobby replied to the topic 'Guider Settings' in the forum. 1 week ago

Increase your guide steps in the Options link to 3000 (assuming it's less than 2000). Keep an eye on each guiding change and set the Minimum for RA and DEC above the general average. 150 might be a good start. Read mouse overs for explanation of each parameter. After that it's all about tweaking to Max and Minutes to find a balance for you setup. It can vary depending where in the sky your imaging and also how good your polar Alignment is.

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Keith Cobby replied to the topic 'ASI120MC-S underexposed band with 5s exposure' in the forum. 1 week ago

All I can suggest further is to try a different USB Cable and of course try using a powered USB hub instead of directly into the RPi3

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Keith Cobby replied to the topic 'ASI120MC-S underexposed band with 5s exposure' in the forum. 1 week ago

Does it happen when you're in 16-bit RAW mode? Your settings show 8-bit.

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Keith Cobby replied to the topic 'Get target RA and DEC values from KStars' in the forum. 1 week ago

What mount are you using? Does it have active encoders when manually rotated?

If you want to know where you are after a manual movement then maybe the Plate Solver can assist. Don't Sync when you capture and solve though and save the captured image with the WCS data in it.

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Keith Cobby replied to the topic 'Reasonable Align Accuracy for CGEM' in the forum. 1 week ago

I use EQ6 and can comfortably achieve under 0.75 arc second if its not windy using the Ekos internal guider. Depending upon where in the sky your imaging you may need to tweak the guiding settings a few times to establish a reliable performance for that position. As with all guiding, polar alignment, scope balance and bias weight is key to optimum performance.

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Keith Cobby replied to the topic 'Use Fitsviewer for Raw statistics (Canon,Nikon,...)' in the forum. 2 weeks ago

Is their any particular reason you don't like the RAW to FITs conversion provider by Ekos? I'm pretty sure there's no loss of the linear data and the FITs file contains all the stats you need. FWIW: If you PREVIEW your images as FITs to match and meet your preferred exposure level, save it as a reference , then capture your sequence in RAW.

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Keith Cobby replied to the topic 'Having trouble with eqmod pointer not matching view of the sky' in the forum. 2 weeks ago

Within the Indi control panel for your mount, is the UTC the same as KStars time?

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Keith Cobby replied to the topic 'Having trouble with eqmod pointer not matching view of the sky' in the forum. 2 weeks ago

Is the solved frame in the correct place?

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Keith Cobby replied to the topic 'Having trouble with eqmod pointer not matching view of the sky' in the forum. 2 weeks ago

If you're starting a fresh session use Sync three times to get your alignment modelled and then you should be on the money to slew to subsequent targets.

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Keith Cobby replied to the topic 'Having trouble with eqmod pointer not matching view of the sky' in the forum. 2 weeks ago

Quick observation;

I noticed that in the solving window you have the Solve Action setting to Slew to Target. Can I suggest you change it to Sync.

I would also suggest deleting any solved results and leave yourself with only the best results for your main imaging camera. It may not actually have any impact but it keep everything neat and tidy.

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Keith Cobby replied to the topic 'NFocus - Negative Number - Inward Focus' in the forum. 3 weeks ago

Is it possible to add a focuser temperature calibration/offset feature within the Indi Control Panel for Rigel nStep config. The actual temperature reading does change but only reads 2.30 (two point three) when I know ambient was around 23. Attached is the nStep manual as a reference for the ASCOM compliant utility features.

I've re-read the Indi tutorials and conceded to the fact that Indi presumes the focuser is full retracted on start up and therefore only assumes it needs to focus outward. This is of course logical and akin to parking the mount. I will park my focuser at the end of each session from now on.

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Keith Cobby replied to the topic 'APN image green' in the forum. 3 weeks ago

Double check the enabled/disabled settings for the FITS viewer. Settings can be found through the options button at the bottom of the CCD window.

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Keith Cobby replied to the topic '"Aborting Autoguide" issue with Internal Guider' in the forum. 3 weeks ago

Have you tried a USB hub rather than have your three USB devices directly connected to the Rpi?

The Rpi has limited milliampere shared between the four USB ports. It's about 1.2Ma I think. A decent 3A USB hub overcomes a lot of worries.

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Keith Cobby replied to the topic 'Kstars clock and UTC offsets' in the forum. 3 weeks ago

I have a similar anomaly. I'm in Dubai, United Arab Emirates, UTC +4.00

I've been thinking; is the KStars UTC time accurate relative to precise GPS location (I do use GPSD taking details from a NEO-6M GPS on one of my Rpi3) rather than General Time Zone? I will try and check again later today what the actually off set is.

I like the idea of such accuracy but would like some options to be displayed.

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