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Equipment Discussions >> Mounts

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freestar8n
Post Laureate
*****

Reged: 10/12/07

Re: ZEQ25 PE Curve new [Re: orlyandico]
      #6171422 - 11/02/13 03:20 AM

Or as Frank would say - what is the actual fwhm you are achieving in your guided images, in arc-seconds? Logs only tell you what the guider thinks is happening - and it can be far from what is actually happening in the image - especially when using a small guidescope. The image is what matters, unless your goal is to frame a plot of the guide log and put it on the wall.

Frank


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Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: ZEQ25 PE Curve new [Re: freestar8n]
      #6171432 - 11/02/13 03:46 AM

Quote:

The image is what matters, unless your goal is to frame a plot of the guide log and put it on the wall.




I never thought about framing a graph, but it sounds doable..

I agree 200% Frank, the image is what matters, bottom line.

So here's a link to some images acquired with the ZEQ and various ota's:

http://www.flickr.com/photos/astronewb2011/sets/72157632878588706/

Right click the images, check the 2048 or original full res image, and let me know how many egg shaped stars you find?

All the best...Paul


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Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: ZEQ25 PE Curve new [Re: orlyandico]
      #6171436 - 11/02/13 03:55 AM

@ Orly ... Really?

All I can say is, at least my PecPrep actually shows the compensated declination (unlike another graph from a really big mount) which continually shows '00'.

Harmonics may be interesting, but all I really cared about was posting a raw PE curve. Done, and done.

Regards...Paul


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jonee523
member


Reged: 10/27/12

Re: ZEQ25 PE Curve new [Re: Astronewb]
      #6171446 - 11/02/13 04:26 AM

Paul, all I can say is thank you for the wonderful information you have shared with those of us who are looking to dive into AP with a lighter budget then some. the information you have shared with us all has helped many including myself decide on a mount for viewing and AP. I can't say I know what all these graphs are. But I can say for visual I know it will be fine. For AP I have seen a lot of pics here and I am very impressed. I look forward to "attempting" AP. If all holds to plan come tax time.

Best regards,

Jon


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Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: ZEQ25 PE Curve new [Re: jonee523]
      #6171609 - 11/02/13 09:19 AM

@ Jon

Thanks for the nice comments Jon. All I can say about this mount is that, if you're in the 'astrophotography on a budget' mode, then I highly doubt if you will find a better device to get the job done in it's price range.

Your comment made me stop and think, and I can't remember ever doing any visual with the mount. I guess if it will take a 70+ minute image by mistake, with minimal trailing, it can handle an eyeball?

Good luck with tax time, keeping my fingers crossed for you!

Regards...Paul


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orion69
scholastic sledgehammer


Reged: 05/09/10

Loc: Croatia
Re: ZEQ25 PE Curve new [Re: Astronewb]
      #6171649 - 11/02/13 09:49 AM

Quote:

Quote:

Correct me if I'm wrong, is this actually measured using Borg 250mm FL?
Is graph compensated for FL of the main scope?




I've asked on a few forums, and have been informed, the correct method is the focal length of the guidescope, not the imaging scope.

Makes sense to me, since PHD is gathering the data through the imaging scope.

Perhaps someone has some other information or can add some information?

Best...Paul




I don't know where did you get that info but it can't be correct. If you want real PE plot then you'll have to use main scope and even then you have to take into account difference in pixel size between guiding camera and main camera.


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anat
professor emeritus


Reged: 06/03/04

Re: ZEQ25 PE Curve new [Re: orion69]
      #6174790 - 11/04/13 02:08 AM Attachment (24 downloads)

I got 20 arcsec (P-P) from my ZEQ25 The following image shows the raw tracking error in arcsec (Y axis) from an autoguiding software (Linguider) with no correction signal to the mount. Note that the time in the X axis was obtained from multiplying the step and 2sec (exposure time). It should have been the step x 2.x sec.

Anat


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ramasule
member


Reged: 04/12/12

Re: ZEQ25 PE Curve new [Re: anat]
      #6178304 - 11/05/13 10:08 PM

It's not even that this is a astrophotography on a budge mount. It's a legit portable astrophotography mount. This thing really is nice.

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