View Full Version here: : What does 35 min with a QHY10 get you?
20-03-2012, 05:01 PM
Ive been trying out further FR and FF from different manufacturers on my 127mm scope to see exactly which will give me a perfect flat field with sharp stars. After testing about 7 different ones I have settled on the P-Flat IV from William Optics. Nice but expensive bit of kit.
So after testing there were a few sucker holes around and so I decided to see what I could get to the North of my site. I managed to get 7x5 min with the QHY10 - PFlat IV and 127 mm scope before the clouds cleared me out.
I reduced it to monochrome as the colour was terrible due to moon and light pollution in such a low number of subs. In hindsight I would have been better off binning the camera 2x2 but that didn't occur to me at the time. Reminds me of a sad face; no flats, bias or darks.
20-03-2012, 05:43 PM
Looks like you have a few dust doughnuts there... nothing an accurate flat-field wouldn't fix.
Looks promising :thumbsup:
20-03-2012, 07:57 PM
That will be quite good if you can gather some more colour data.
It's sharp enough to give some quite nice detail.
20-03-2012, 08:23 PM
Thanks Alpal, but I posted this image so that owners of this scope could see a viable option for a FR/FF that actually works and gives pinpoint stars to the very corners without a great deal of vignetting. It really isn't a "pretty" picture but a working image to evaluate the success of the optics. In that I'm satisfied. With our current weather conditions it will take a long while before we have a good clear run for any imaging.
20-03-2012, 09:14 PM
Yeah, the colour is a little bland, Allan. Is your monitor calibrated? You must have the saturation up too high.
Can't I just be serious for once in my life? :)
20-03-2012, 09:28 PM
Here's one just for you Troy
20-03-2012, 09:30 PM
Allan, I agree that it looks very promising. Which 127 mm scope is it?
20-03-2012, 09:38 PM
It's the fore-runner to the Meade f7.5 127mm triplette with Japanese glass that I purchased from MyAstroShop. Steve Massey imported two scopes for evaluation and I snapped up the second one while he took the other.
20-03-2012, 09:43 PM
Thanks Allan. Good luck with your testing.
Very clear sky here tonight, but seeing is atrocious!
20-03-2012, 09:47 PM
That's much better. Me likey.
20-03-2012, 09:50 PM
Looks like the Pflat 4 is doing the trick Allan.
20-03-2012, 11:40 PM
Thanks Peter but couldn't have done it without your heads up and Troy's generosity.
22-03-2012, 02:34 PM
I love the image scale for that. Perfect.
You got a lot of detail for only 35 minutes.
Very promising indeed.
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