Paul Nixon replied to the topic 'Can I default to "Native"?' in the forum. 2 weeks ago

I agree.

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Paul Nixon replied to the topic 'Can I default to "Native"?' in the forum. 3 weeks ago

Just a small update.

Somehow, after many nights of having to change from FITS to Native, it's suddenly remembering Native by default. No idea why.

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Paul Nixon replied to the topic 'Nikon flats Ekos exposure time problem?' in the forum. 3 weeks ago

I figured out the exposure wasn't so weird after all - it's simply what the camera is programmed for. ;)

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Paul Nixon replied to the topic 'Meridian flip' in the forum. 3 weeks ago

Hi Brian - I do have the CEM25p. I sure hope it's not motor slippage (or worse, the dreaded gear slip)! ;) However, you gave me the idea to check the settings and I've done something similar to you so thanks!

Hi Wolfgang -not a live stack. It's one of the images captured during the session. I'm sure this is the result of the mount rather than Ekos performing the flip. Last night I had changed the settings and got the flip though there's something I still need to change in the settings.

Hi El Corazan - very interesting. Now I'm anxious to give my DIY mount a try with this!

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Paul Nixon replied to the topic 'Nikon flats Ekos exposure time problem?' in the forum. 3 weeks ago

I found the "Force Bulb" setting in INDI and turned it off. Success...well, mostly. For some reason, setting an exposure of 0.002500 yields 1/640. Weird, but I think it will do.

Thanks very much!!!

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Paul Nixon created a new topic ' Nikon flats Ekos exposure time problem?' in the forum. 3 weeks ago

I must be overlooking something - I'm using a Nikon D5300 in bulb mode - works great for long-exposure. However, trying to capture flats it seems I cannot really control the exposure time. For example, I just tried to shoot 1/10sec and it shot 1/4sec. 1/20sec also yielded 1/4sec. I cranked it all the way to the fastest setting in Ekos and it yielded a 11.1sec exposure.

What am I missing?

Thanks.

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Paul Nixon replied to the topic 'Can I default to "Native"?' in the forum. 3 weeks ago

Thanks for the quick reply!

Unfortunately, it did not remember to leave it as "Native" for some reason. I even changed the camera configuration to be Native but it was still set to FITS in Kstars. In fact, that's exactly what it's set to right now after rebooting to get last night's files off.

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Paul Nixon created a new topic ' Can I default to "Native"?' in the forum. 4 weeks ago

Tonight I'm two hours into an imaging session and just realized I forgot to change the default format from FITS to Native. Can I make "Native" the default?

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Paul Nixon replied to the topic 'Trying to get Stellarmate running on Raspi4' in the forum. 4 weeks ago

From the Stellarmate page. I didn't know there were two images and downloaded the wrong one first. ;)

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Paul Nixon created a new topic ' Meridian flip' in the forum. 4 weeks ago

Last night imaging M31, I (apparently) experienced meridian flip. However, while the camera kept taking pictures, M31 was in frame but no longer centered (see picture).

I didn't do anything special - I actually hadn't anticipated the flip. But based on this video: www.youtube.com/watch?v=stsrcsPxUZA and my picture, I think my mount performed the flip rather than Ekos. How else would I have both images of M31 in the same frame?

Anyway, here is the picture:



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Paul Nixon replied to the topic 'PAA & CEM25p unexpected behavior' in the forum. 4 weeks ago

Parking is a problem. Even after carefully setting park and home positions, the mount was unable to park in the correct place after polar alignment. Will provide logs when I can.

Making progress though. ;)

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Paul Nixon replied to the topic 'First time autoguiding' in the forum. 4 weeks ago

Every 10 minutes? I *think* that may be periodic error.

"Even quality machined mount parts like worms, worm gears, shafts are not absolutely perfect. The parts are machined in micrometer precision at best. We must realise that in astrophotography we require tracking precison up to arcseconds. That means, that e.g. teeth of teeth on perimeter of wheel with diameter of 8cm must be machined with accuracy of hundreeds of nanometers!
As mount's shaft rotates, any error in its surface and shape and also in worm and worm gear surfaces and shapes causes a periodic bump in tracking. The most observable is so called periodic error of the mount which is caused by inaccuracy of of worm. The period of this error takes one revolution of gear (usually 5-10 minutes for common mounts)." ~http://www.pk3.org/Astro/index.htm?astrophoto_mount_errors.htm

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Paul Nixon replied to the topic 'PAA & CEM25p unexpected behavior' in the forum. 4 weeks ago

So, I guess the lack of park data was at least part of the problem, but something is still weird.

With the mount in the zero position, I set home and park. They should be the same thing - send the scope home or park the scope should send it to the same position. But they don't. Well, sort of. Basically, when I was starting out I slewed randomly and then "parked" - the scope returned to it's park/home position. But after 2-3 hours of tracking, park and home became separated, with park somehow becoming about 40 degrees East. As I said, weird.

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