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)
Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: Parallax 250 HD Installed and Working! new [Re: jrbarnett]
      #4438994 - 03/10/11 01:56 AM

11" f12 GOTO refractor... that's obscene! I look forward to your pointing results. I imagine such a setup would benefit from a pointing model. I wonder what errors meridian flip will introduce on such a massive OTA.

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

Reged: 12/30/06

Re: Parallax 250 HD Installed and Working! new [Re: Mike Clemens]
      #4440649 - 03/10/11 06:02 PM

Thanks Jim and excellent questions that have been on my mind Mike.

I fully suspect there is some flex and non-orthogonality in my scope, almost certainly some from the rotating rings alone. I guess I'll see about the pointing accuracy. If anything, I can use the "Tour" mode since everything will be visual but I would like fairly accurate go-to's without having to fiddle around.

I'm prepared, if necessary, to go to third party pointing and modeling software. Any suggestions?

Jeff


Post Extras: Print Post   Remind Me!   Notify Moderator  
clintwhitman
Caveman
*****

Reged: 01/01/07

Loc: CALI SoEasyACavemanCanSlewIt
Re: Parallax 250 HD Installed and Working! new [Re: Jeff B]
      #4441710 - 03/11/11 05:53 AM

Awesome Jeff so is the series II for sale??

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

Reged: 12/30/06

Re: Parallax 250 HD Installed and Working! new [Re: clintwhitman]
      #4441853 - 03/11/11 09:02 AM

Quote:

Awesome Jeff so is the series II for sale??




Not yet Clint. I'm keeping it in "reserve" until I complete my evaluation of the Parallax mount.

So, have you hoisted your Series II up on to your new pier yet?

Jeff


Post Extras: Print Post   Remind Me!   Notify Moderator  
frolinmod
Carpal Tunnel


Reged: 08/06/10

Loc: Southern California
Re: Parallax 250 HD Installed and Working! new [Re: Jeff B]
      #4442243 - 03/11/11 12:24 PM

Quote:

I'm prepared, if necessary, to go to third party pointing and modeling software. Any suggestions?




I'd recommend TheSkyX Professional Edition for Mac or Windows plus T-point Add On to TheSkyX. Use the new supermodel feature. It's fantastic.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: Parallax 250 HD Installed and Working! new [Re: frolinmod]
      #4442954 - 03/11/11 07:00 PM

> Any suggestions?

It's an AP goto system right? it will use Ray Gralaks AP ASCOM driver and the upcoming APCC software. If so, a pointing model is being built into that.


Post Extras: Print Post   Remind Me!   Notify Moderator  
dothead
scholastic sledgehammer


Reged: 08/13/08

Loc: Heidelberg, Germany
Re: Parallax 250 HD Installed and Working! new [Re: Jeff B]
      #4443324 - 03/11/11 10:12 PM

Hey Jeff,

re flexture - what's the wall thickness of the (aluminium?) tube ?


Ralph


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

Reged: 05/02/04

Loc: Long: 81.42 W Lat: 41.21 N
Re: Parallax 250 HD Installed and Working! new [Re: dothead]
      #4443578 - 03/12/11 12:43 AM

OHHHH MY GOD!!!!! That looks so much like a GRAND UNITRON!!!

DO I LOVE that setup you have! WOW WOW WOW!!!

I really am looking forward to your report on the performance and tracking accuracy of this mount/telescope combination.

(aveman...sorry but this one looks much NICER than your pearlescent 9 inch Unipons!


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

Reged: 12/30/06

Re: Parallax 250 HD Installed and Working! new [Re: Mike Clemens]
      #4450287 - 03/14/11 10:03 PM

Quote:

> Any suggestions?

It's an AP goto system right? it will use Ray Gralaks AP ASCOM driver and the upcoming APCC software. If so, a pointing model is being built into that.




Well I actually had some good weather in the daylight to spend some time getting used to the operating system. Kept screwing it up for a while but I eventually got a good sync on the moon and did some manual slewing around at 600X to check balance and the adjusted worm-to-gear tweak to reduce backlash. I then go-to'd back to the Moon and it went right back to where I started. So I'm encouraged so far but I need to do a 2 star drift alignment when the weather permits.

The mount is at least as stable as the Byers Series II. As RA is always drive there is very rapid damping on that axis, ~ one highly damped back-forth cycle after a nudge. Damping in the DEC depends highly on the balance on that axis. Since the worm is not constantly driven, if it's out of balance by much, it will still "bounce" a bit after a tap due to the residual backlash, which is now very small, but you still need some for proper running clearance. If the tube is well balance though, things dampen very quickly as there is no bounce. It's all no worse than the Byers Series II and in some orientations, better, plus it has go-to, something the Byers does and cannot have with the tangent arm DEC.

BTW, talked to AP today and their hoping to get the new chip out which contains the modeling in 2-3 months. But I know how things work in Beta testing so go-figure go-to in 3-4 months.

Jeff


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


Extra information
17 registered and 20 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: 2212

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics