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Old 25-11-2015, 08:56 AM
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rustigsmed (Russell)
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Join Date: Mar 2012
Location: Mornington Peninsula, Australia
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qhy22 first test image help me troubleshoot star shapes and a few other questions

Hi all,

took delivery of a new qhy22 (thanks Theo!) recently and haven't been able to get out because of bad weather. this is my first ccd, moving up from dslr so I know its going to take a while to get it all up and running to how i'd like it to.

I have ezcap the qhy software and have a trial version of SGpro. I found myself polar aligning and focusing with ezcap (couldn't find liveview on sgpro I also couldn't get SGPro to connect with my moonlite focuser (maybe that's why I couldn't see a live view function). not sure how i'll remedy that yet - open to suggestions. saying all that I struggled getting a good polar alignment (maybe because I was tired and rushed) however it felt like I could have done it 3x quicker with the realtime live view of a dslr. but I can get used to that.

In SGpro and software is the temperature readout eg -30deg C actually -30 or is it minus 30 degrees of what the sensor was at? the qhy22 is able to go -45 so i'm not sure what figure I should be plugging into the temp control.

I have this on a newt with an OAG. I hadn't really sorted out exact parts but thought I would be pretty close to correct spacing with existing parts if I used my MPCC. to reach focus however I had to put it in a crappy extension tubethingy (single screw tightened - no ring).

anyway I've linked to two test shots. the star shapes a fairly crazy in both images. one is a 5min bin2x2 and the other is a 15min 1x1 Ha in 97% moon. no flats or darks - quick and nasty stretch to show the stars.

My guess is a combination of incorrect spacing for the coma corrector and perhaps tilt from the extension tube mechanism (and perhaps softish focus) but interested to hear other peoples thoughts if they think its a correct hypothesis? I think I will move back to the RCCi but will need to find an m48 extension of about 36.5mm I think (to account for the sensor to front of camera distance difference between DSLR and qhy22 ... 44mm-7.5mm). that will push the camera back to a position that the focuser can handle without a third party extension tube also.

15min 1x1 Ha
https://www.flickr.com/photos/803366...blic/lightbox/

5min 2x2 Ha (actually 4x4bin 1 min)
https://www.flickr.com/photos/803366...blic/lightbox/


edit: whoops that 2x2 bin version above was actually a 4x4 bin

here is 5min 2x2
https://www.flickr.com/photos/803366...blic/lightbox/

Thanks

Rusty

ps - pretty excited to get this camera up and running, despite the wonky image I can already appreciate the resolution and lack of noise over a dslr

Last edited by rustigsmed; 25-11-2015 at 09:03 PM.
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