Mohamed replied to the topic 'Re:Celestron focus motor' in the forum. 5 days ago

El Corazon wrote: The DRV8825 stepper controller allows you to select microstepping down to 1/32, i.e. 32x200=6400 steps/rev. In fact, you can use any microstepping mode in 2x intervals.
I am using my NEMA17 at 1/32 microstepping and the resolution is far better than required for my telescope, so you can try out how much resolution you require.


Tanks Jo for explanation. Is this settings from the driver interface or the Nano code?


Thank you
Mohamed

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Mohamed replied to the topic 'Re:Celestron focus motor' in the forum. 5 days ago

El Corazon wrote:

mhammady wrote:

Bart wrote: Hi mate,
I have 3D printed a focus motor attachment & coupler for my C8.
I've shared a photo of my setup before here, I guess you can find it there.
What I like is that it still has a (big!) handwheel.

Would you like to have the design?
It uses a direct drive very flat Nema 17 stepper motor and the SilentStepper drivers (TMC2130) on a breadboard still.

Works flawlessly and runs absolutely smooth. I have attached a temp sensor and configured it to play well with the Moonlite protocol.

Cheers!
Bart



Hi Bart, thank you and would appreciate if you can share your 3D designs. I’m in the process of building mine.

One more thing is that your motor is much lighter and smaller (as I can tell from pictures) from the one I got, can you please also share your hardware specs as well?


Thank you
Mohamed



I use the MyFocuserPro, not the MyFocuserPro2 IDE, but assume much of it is interchangeable. The cranking power of a regular NEMA17 is plenty to lift a truck attached to a camera (figuratively speaking). A NEMA14 should be plenty. You can drive both from a DRV8825 stepper controller.

The beauty of building your own focuser is that once you have done it once, adapting it to another telescope is easy.

Also, with a DRV8825 you will have a stepper resolution of 6400 steps/rev, i.e. ~ 0.05 degrees, which more than likely is far better than the mechanical tolerance of your focuser.

All I can say is, I built one based on the MyFocuserPro (not 2) instructions and the result could not possibly (repeat; possibly!!) be better.

Jo

PS: Looks like Bart is using a slim version of the NEMA17 ( smile.amazon.com/gp/product/B00PNEQ79Q/r..._title?ie=UTF8&psc=1 ). I have that as well, but have not implemented it yet. Should work fine, though, I assume.


Thank you Jo, what confuses me a little is that the specs of the motor you mentioned in Amazon is “This is Short Height Bipolar Nema 17 stepper motor with 1.8 deg. step angle (200 steps/revolution). “

Is this specs still capable of 0.05 degree/step?

I would prefer using a lighter motor as the one I got is much heavier...


Thank you
Mohamed

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Mohamed replied to the topic 'Re:Celestron focus motor' in the forum. 5 days ago

Bart wrote: Hi mate,
I have 3D printed a focus motor attachment & coupler for my C8.
I've shared a photo of my setup before here, I guess you can find it there.
What I like is that it still has a (big!) handwheel.

Would you like to have the design?
It uses a direct drive very flat Nema 17 stepper motor and the SilentStepper drivers (TMC2130) on a breadboard still.

Works flawlessly and runs absolutely smooth. I have attached a temp sensor and configured it to play well with the Moonlite protocol.

Cheers!
Bart


Hi Bart, thank you and would appreciate if you can share your 3D designs. I’m in the process of building mine.

One more thing is that your motor is much lighter and smaller (as I can tell from pictures) from the one I got, can you please also share your hardware specs as well?


Thank you
Mohamed

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Mohamed replied to the topic 'Re:Celestron focus motor' in the forum. 5 days ago

dmsummers wrote: If you don't already have the focuser, it might be wise to consider how much resolution you need/want for your setup. The Celestron focuser has 1000 steps per revolution. The ASI and Pegasus focusers (for example) have 5K+ steps/revolution. You might not need the extra steps for an F10 setup but it's something to consider. Cheers...


Thank you dmaummers. Definitely focusing resolution is something to highly consider and many thanks for highlighting this. Can I assume that the myFocuserPro 2 DIY focuser have the same specifications?


Thank you
Mohamed

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Mohamed replied to the topic 'Re:Celestron focus motor' in the forum. 5 days ago

Gonzo wrote: I run one on my C6 OTA which rides on an HEQ5 mount. The Celestron focuser is supported by indi and has worked flawlessly.

One note is that I had to do the initial calibration using the windows app because triggering the calibration routine via the indi driver would result in a crash. The calibration is stored in the focuser, so you only have to do it once. The indi driver will read the calibration values stored in the focuser after that.


Thank you gonzo, how do you evaluate autofocus with ekos and what method you are using?


Thank you
Mohamed

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Mohamed created a new topic ' Celestron focus motor' in the forum. 5 days ago

Hello

Anyone has experience with the celestron focus motor with C8SE OAT?

I was in the process of building my own myfocuserPro2 till some friend advised I should try the celestron focuser motor.


Thank you
Mohamed

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Mohamed replied to the topic 'M 1 - Crab nebula' in the forum. 2 weeks ago

knro wrote: Thanks for submitting it, your images are getting improved, but there is still room to improve.

The star do not look right in the image. It appears they have some coma? Maybe the scope requires collimation? maybe field not flat enough issue? I'm not really good at this but something is definitely off.


Thank you Jasem. I agree, there are a lot needed to be corrected. The stars looks bigger than I expect, and with close attention to the very small ones in the periphery, it looks like a trail in one direction. I'm setting major portion of today's session for alignment checking (PS: I don't have access to Polaris so I do polar alignment using other techniques). I checked the collimation yesterday and it looks ok.

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Mohamed replied to the topic 'EKOS autoamted FLAT and ADU%' in the forum. 2 weeks ago

HI Paolo

I don't remember the need to set ADU % in EKOS. Can you please share a screenshot?

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Mohamed created a new topic ' M 1 - Crab nebula' in the forum. 2 weeks ago



This is my 1st RGB+Ha frames integration. More work required in alignment. I've learned a lot from members of this forums, and more comments and advices are welcome...


Equipment

Imaging telescope / lens Celestron Schmidt-Cassegrain (SCT) 8"/2032 mm 8SE
Imaging camera ZWO Optical ASI183mm Pro (CMOS)
Mount Equatorial Sky-Watcher HEQ5 Pro
Guiding telescope / lens Celestron Schmidt-Cassegrain (SCT) 8"/2032 mm 8SE
Guiding camera ZWO Optical ASI120MM Mini (mono) (CMOS)
Filters Baader Planetarium H-alpha (Narrowband Hydrogen Alpha) 35nm 1.25" 90%ZWO Optical Red 1.25" 90%ZWO Optical Green 1.25" 90%ZWO Optical Blue 1.25" 90%
Accessories Off-axis guider ZWO OpticalFocal reducer Celestron 0.63xFilter wheel ZWO Optical 1.25"Automatic focuser JMI MotoFocus+
Processed with Siril 0.99.6, GIMP (GNU Image Manipulation Program) 2.10.20 (revision 1)


Frames / Subs

Lights (filter Red) 45 x 60 sec
Lights (filter Green) 45 x 60 sec
Lights (filter Blue) 45 x 60 sec
Lights (filter H-alpha) 37 x 180 sec
Darks 50 x 60 sec
Darks 50 x 180 sec
Flats 50
Bias 60 x 0.001 sec
Total lights integration time 4:06 hours


Acquisition

Date Mon Nov 16th 2020
Seeing 3 / 5
Transparency 3 / 5
Sky Darkness #4 Rural/suburban transition - 6/9
Camera Sensor Temperature -10.0 ºC
Binning 2x2
Gain 111

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Mohamed replied to the topic 'Light leak' in the forum. 2 weeks ago

Thank you Ihoujin... You are correct. In my yesterday shooting for M1, I found that I've been using the wrong exposure for the dark frames. I shot them again, and all the glow is gone away.

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Mohamed replied to the topic 'Light leak' in the forum. 2 weeks ago

Thank you Bart. I've been reading about the proper GAIN/offset/exposure calculations for my camera, and it seems that I'm lost. Is there is an easy way to calculate the proper values to be used when we decide to make exposure?

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Mohamed replied to the topic 'Re:Light leak' in the forum. 2 weeks ago

knro wrote: That's amp glow. It's a known issue for CMOS camera, you can read more on it.

Btw, your stars are either out of focus, or saturated, or both.


Thanks Jassem, I’ll look into the cmos amp glow.

About the stars being out of focus or saturated, I understand the out of focus but not the saturated part. Can you please highlight what do you mean by that?


Thank you
Mohamed

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