Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Equipment Discussions >> Mounts

Pages: 1 | 2 | (show all)
AndreyYa
member


Reged: 12/05/06

Loc: Sunnyvale, CA
Re: Mach1 Remesh new [Re: blueman]
      #5952506 - 07/03/13 04:01 AM Attachment (8 downloads)

Gents, thank you for your comments and answers.

Just to make things clear: I'm happy with current tracking performance of my Mach1. These numbers are hardly possible with Atlas or Sirius: having 0.25'" RMS error for 7 sec guiding exposures. I'm just afraid it will be not enough for 1000-1500mm FL.

I'm still not familiar with PemPro. I analyzed tracking log with PecPrep and didn't see there any suspicious signs. Just in case please see attached PecPrep chart for guided tracking (510mm FL, QHY5, guiding exposure 7 sec). But... it explains nothing regarding DEC tracking.

Edited by AndreyYa (07/03/13 04:08 AM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
AndreyYa
member


Reged: 12/05/06

Loc: Sunnyvale, CA
Re: Mach1 Remesh new [Re: AndreyYa]
      #5952510 - 07/03/13 04:11 AM Attachment (8 downloads)

And unguided tracking looks nice as well - about 5" p-p periodics.

Edited by AndreyYa (07/03/13 04:11 AM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
orlyandico
Post Laureate
*****

Reged: 08/10/09

Loc: Singapore
Re: Mach1 Remesh new [Re: AndreyYa]
      #5952534 - 07/03/13 05:01 AM

It will be enough. My RMS guiding on my Mach1 is about 0.5" and I successfully was able to do 5- and 10-minute exposures of Cleopatra's Eye and the Eskimo at 2350mm, and 2 minutes on Cleo with a 2X barlow (e.g. 4700mm). This was using a C9.25 so about 30lb of payload and a QHY8, so the pixel scale was 0.68" (at native FL) and 0.34" barlowed.

My RMS guiding never gets better than 0.5" to 0.6" - I think it's the seeing.

Cleo's Eye at 4700mm @ 2 minute subs



Eskimo @ 2350mm



These aren't particularly good images, took them from my balcony with mag 3 skies (!!!) and I didn't use an OAG, just a Meade 60mm f/9 as a guide scope.


Post Extras: Print Post   Remind Me!   Notify Moderator  
AndreyYa
member


Reged: 12/05/06

Loc: Sunnyvale, CA
Re: Mach1 Remesh new [Re: orlyandico]
      #5953475 - 07/03/13 05:01 PM

Thank you Orlyandico.
I'll check guiding capabilities for longer focal length with my Mak-Cass, I expect to have about 1200mm FL with reducer.


Post Extras: Print Post   Remind Me!   Notify Moderator  
blueman
Photon Catcher
*****

Reged: 07/20/07

Loc: California
Re: Mach1 Remesh new [Re: AndreyYa]
      #5953868 - 07/03/13 09:35 PM

Quote:

And unguided tracking looks nice as well - about 5" p-p periodics.




This all looks pretty good really. 5" PE is good, my AP900 is 6-7" and I image at 740mm and 980mm with great looking stars.
I am sure it could handle long f/l with out a problem.
But as I said before, it is possible that conditions could still be an issue.
Blueman


Post Extras: Print Post   Remind Me!   Notify Moderator  
orlyandico
Post Laureate
*****

Reged: 08/10/09

Loc: Singapore
Re: Mach1 Remesh new [Re: blueman]
      #5953922 - 07/03/13 10:05 PM

Mine is either 5" or 7" depending on whether it's east heavy or west heavy. In both cases PEM knocks it down below 1". I don't think AndreyYa would have any trouble whatsoever at 1200mm.. that's the reason people buy these mounts, so you don't worry about pedestrian concerns like these

Post Extras: Print Post   Remind Me!   Notify Moderator  
AndreyYa
member


Reged: 12/05/06

Loc: Sunnyvale, CA
Re: Mach1 Remesh new [Re: orlyandico]
      #5956195 - 07/05/13 02:45 PM

Thank you Orlyandico.
Last session demonstrated that DEC problems disappear when I'll do less precise Polar Alignment.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Scott99
Carpal Tunnel
*****

Reged: 05/10/07

Loc: New England
Re: Mach1 Remesh new [Re: Calypte]
      #5957460 - 07/06/13 12:30 PM

Quote:

Really, anyone with an issue concerning an A-P mount, especially a new one, should call A-P. Part of the reason you paid all that money for Astro-Physics is their exemplary customer service. Use it! As for the DEC gear mesh, in 3 years of owning a Mach1GTO, I've never had to touch the DEC gears.




same here, it would be surprising for a mount shipped from AP to need it. However, I have had to do this for Tak and AP mounts that I purchased used.

No need to be afraid of this, it's easy. You'll notice if the mesh is too loose - turning the counterweight shaft back & forth as described above is an easy way to test it. If it's too loose, just tighten by very slight amounts, keep turning the shaft a bit and you'll feel backlash being taken up.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | (show all)


Extra information
10 registered and 32 anonymous users are browsing this forum.

Moderator:  Dave M, richard7, bilgebay, iceblaze 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 1397

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics