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 >> Cats & Casses

Pages: 1
Carpal Tunnel

Reged: 01/06/04

Loc: Toronto, ON, Canada
Field performance of the LX600/800
      #5563056 - 12/09/12 07:53 PM

Hey All,

I was reading in the mount forum about the latest on the LX800 mount based on some images that Jason Ware has published. He has taken the time to contribute to the thread and posted a good bit of detail about his experience so far. Looks like they are finally making some progress.

As part of many people critiquing the images, Jason included some details about the optical system and it's performance (a 12" f8 version). In a recent thread on this forum (that eventually got locked...) where the field performance about the LX800's was being discussed, specifically around it's flatness performance, there were some comments made that these Meade's were just as good as the Celestron Edge HD's.

The details posted by Jason Ware and his test images have shown a more accurate picture of the Meade's performance, and it is not as good as the Edge HD. I would estimate that the Meade has about half the diameter field where the flatness is good as compared to the Edge HD. In fact, it's only slightly better than a standard F10 SCT (I'm guessing related to the slightly lower magnification factor of the secondary).

Jason indicated that he was using a 6303 chip for his images, and in the outer parts of the field, you can see the shape of the star images starting to suffer. Interestingly, I thought that the images almost looked like they had coma, but perhaps it's something related to guiding issues the LX800 mount is still having or seeing. I would expect the seeing or the guiding errors would affect all star images across the field, but these are specifically in the outer edges and corners.

Here's a link to Jason's images:
LX800 Helix image

For reference, here are the Edge HD images with the chip overlay shown. You can see the 6303 chip is about half the size of the 16803 used for these images.

Flickr Edge HD Annotated Image

Here is a link to the thread in Mounts. Jason's very detailed update is near the bottom this page (p.2):

Jason Ware test images thread from Mounts forum

Anyway, good to finally see some actual real world images. It confirms my feelings that the Edge HD's are the better performing platform for me since I found the field curvature to be a real issue in the standard SCT for wide fields and longer FL EP's, and I'm glad I ended up going this route instead of the Meade.

Clear skies,

Post Extras: Print Post   Remind Me!   Notify Moderator  
Peter in Reno

Reged: 07/15/08

Loc: Reno, NV
Re: Field performance of the LX600/800 new [Re: Gord]
      #5563100 - 12/09/12 08:37 PM

I think you uploaded the wrong image regarding to EdgeHD Annotated image. Your link pointed to standard Celestron SCT image.

This link points to Celestron EdgeHD SCT:

If you zoom the link you provided, you can see out of focused or coma stars at the edges. The link I provided shows far less coma stars.


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

Reged: 01/06/04

Loc: Toronto, ON, Canada
Re: Field performance of the LX600/800 new [Re: Peter in Reno]
      #5563132 - 12/09/12 09:03 PM

Thanks for pointing that out Peter, you're correct. I cut-n-pasted the link from the wrong tab! You can see a big difference in the appearance of the outer fields between the two.

Clear skies,

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1

Extra information
11 registered and 23 anonymous users are browsing this forum.

Moderator:  Starman27, kkokkolis 

Print Thread

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

Thread views: 857

Jump to

CN Forums Home

Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics