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Les and Paul, That's what is strange about this. My guiding was better on the bad image. Is was only just about dark on the good image. Total rms was 0.71". On the second bad image it was about 1 hour

The exact location of the guide star doesn’t matter, as long as it’s in or near the field of the main camera, then given that all the trails are about the same length, it can’t be field rotation

Hi Peter, Hard to say. Maybe something shifted or loosened up after slewing to low altitudes? Differential flexure is often hard to find, as it can be unpredictable. It depends on the position

Thank you, Paul. A very nice idea to save, not lose, the efforts being offered.

Yes, but likely off center, not sure were. Like I said to Paul, first image is fine, slew to a southern target and return back and everything gone to pot. I think I know what you are thinking, I'm

Paul thanks, So why the sudden change? First image stars are great. Slew to a target at low altitude and 150 rotated, then come back to same target and suddenly the stars are drifting north. Could my

Hi Folks, I've created a new table for this group that is meant to contain short descriptions and definitions of obscure terms and abbreviations. The table is editable by all members, and I invite

Undersampled guiding can certainly result in worse tracking performance. Usually it will not result in a continuous star drift on the main imager but can result in bloated stars and sometimes,

One more question: Is the guide star somewhere in this field of view of the main camera? -Les

Those are some serious star trails. A couple more questions: Are those star trails north-south, or east-west? That is, is it trailing in declination or in RA? How good is the DEC balance? With the

I live in the northeastern US and am a G11 owner. ...I image with a 1000mm f/l scope and use 400mm for tracking, with a? ratio of 2.5, typically getting RMS values under 0.5 and with good seeing,

Very good thinking, Les! I will see if the PC DEC slew works properly. Best, Michael

Why not, Peter? If your guide scope guiding is not showing any large errors and the main imager shows constant drift, this is most likely differential flexure. Other possibilities include differential

Ooops this is a G2 – in which case a burnt out motor control PIC. Sent: 08 August 2021 16:23 To: '[email protected]' <[email protected]> Subject: RE: [Losmandy_users_io] Gemini-2

Most likely a burnt out PAL decoder for the Dec channel – you need to program it of course. Sent: 08 August 2021 15:24 To: [email protected] Subject: Re: [Losmandy_users_io] Gemini-2

Hi David, You adjust the back off bolt so that the worm friction drops to it's minimum. That is, you want the worm to just *lose* contact with the worm wheel gear it is driving. If you are adjusting

The next obvious guess would be resoldering the hand controller socket. Then start tracing the HC signals to look for something gone wrong. This would be easiest if you have a good board to do an A/B

Just one more little thing. Before I even touched my mount, I made sure I had a complete understanding of what the factory settings were. I wanted to make sure I had a reference point to refer to when

I have seen the new "milled down" (front or back full side) with the milled down bottom stud (aka "nipple") only on new SLW (spring loaded worm) drives. Earlier wirm blocks were completely black

David, I drilled and made my pivot hole larger. Most folks with new mount probably will not want to do that. Peter