Timo, 1800ms is 1.8 seconds. Backlash movement is usually calculated at the sidereal rate which is 360 degrees divided by 23.934472 hours (the length of a mean stellar day - note this 0.0084 seconds

PLEASE don't reply to a digest version on the non-digest list! ... it means hundreds of others get to download a boat-anchor of stuff that they don't want and don't need! Thanks Philip

PLEASE don't reply to a digest version on the non-digest list! ... it means hundreds of others get to download a boat-anchor of stuff that they don't want and don't need! Thanks Philip

Well done! Sent from Mail for Windows 10 From: ap-gto@... Sent: Sunday, October 16, 2016 2:30 AM To: ap-gto@... Subject: [ap-gto] Digest Number 6512 AP GTO Group 4 Messages Digest

Hi, Have you ever had a “marginal” CCD or other astro USBdevice connector ... or the USB cable gets so loose from years of wear andtwisting in its socket, that it unplugs much too easily

Hi Kent, Thanks for informing that 10 arc-sec backlash data. Here I have an earlier email message from George saying that my 1800ms backlash compensation in PHD2 would mean over 30 arc-secs

Very nice, thanks for sharing. Floyd

Hey Kent, I wouldn't mind knowing how the 'dial' method works. Can you share? Steve From: ap-gto@... on behalf of kentdegroff@... [ap-gto] Sent: Saturday, 15 October 2016 1:12 p.m. To:

Hi Timo, FYI, I get on the order of 10 arc-secs backlash with my 1200. I have the AP V2 Driver backlash set to 0 and use the backlash setting in SGP2 to correct it. Seems to work ok that way. You

Hi all, I'd like to share this image of SH2-101, the Tulip nebula, done with my Riccardi Honders astrograph back to home after an optical repair. The scope now free of astigmatism is really impressive

LOL! I know. It was actually on my G11 being used for visual. It was on the pier beside the Planewave/Paramount. I got a mouse infestation in the Planewave and they tore out the heater wiring harness.

Putting an AP155 back into action as an "impulsive" act. What a concept! Christopher Erickson Consulting Engineer Summit Kinetics Waikoloa, HI 96738 www.summitkinetics.com

In this case backlash has no effect whatsoever on RA. The gears never reverse, so any reversing delay is not applicable. Rolando

Wouldn’t you want to send both the DEC and the RA at the same time. Then they are both starting from a known baseline. Would suck to do only the Dec and then 6 months later have an issue with the RA

“It's a very old mount, probably has been slewed around the sky for many many years. Eventually the teeth on a metal gear will wear. The solution is to send the gearbox back and we will fit new

Christopher, I agree mostly with what you said. I think in my case, the rings are old and the felt is pretty much crushed so my 155 isn't moving in the rings like it might if the felt was

The only scope I have ever owned that didn't suffer from differentialflexure between a piggyback guide scope and the main scope is my AP130EDF-GT. That is why I ONLY use off-axis/radial guiders

Timo, Let me know if you have not received the RA number email. Regards, George George Whitney Astro-Physics, Inc. Phone: 815-282-1513 Email: george@... From: ap-gto@...

I don't have any pics of an imaging setup on my 900 right now so Iwould have to set up and take some. These days I mostly image with myMach1+130EDF-GT+SBIG STF-8300M/FW5/OAG/STi and use my 900+C14

Vince, you want the guide scope/camera to be fixed relative to the back of your imaging scope. Ideally mounted on the focuser but with your scope that seems impractical. You could try a second pair of