AP Images Taken with Original NexStar
Posted 28 March 2013 - 05:45 AM
Nice James, quite sharp. The Neximage does really well on the Moon doesn't it? You should try a mosaic next time, though painful and time consuming, well worth in the end. I tried once but just didn't have the patience to complete.
Posted 30 March 2013 - 09:13 AM
Posted 30 March 2013 - 01:04 PM
Open clusters are amongst my favorite target.
Thanks for posting.
Posted 01 April 2013 - 03:20 PM
Posted 01 April 2013 - 07:23 PM
You've given me the courage to post my second attempt (technically, it's the third--on the second attempt, I missed the target :-) at AP. Here's M51--took flat frames, but I think they over-corrected, because I unmounted the camera and remounted after taking the flats. Then, aligned the scope; moved to M51; did a 'precise goto'; took out the diagonal/ep, and put in FR/camera (Canon T3/1100D); used Alkaid as both the precise goto star and focusing aid.
10 dark frames midpoint. A total of 150 light frames at 30 seconds, ISO1600--but clouds moved in while I wasn't looking. DSS used 61 frames (I manually threw out 30 frames too).
Photoshop Elements to crop & enhance GB; reduce R. I can't figure out (yet) how to add a grey gradient to the picture (darken the top, because I think my flat frames were overly vignetted).
Posted 02 April 2013 - 02:24 AM
Posted 04 April 2013 - 05:35 AM
Also, James, a great attempt at Saturn with a sizeable image. :bow: How large though was the stack ? Did you stack and process in Registax 6 ?
Forgive me but I couldn't resist a further look at it in P/Shop. I think I eliminated some of the unfortunately associated "noise" but with, naturally, some loss of sharpness. (I may however have gained a little by reducing the frame size). That's what makes me think that perhaps your stack number was limited and thus the noise to signal ratio was high ?
Overall though, I firmly think you're not far off attaining the full potential your camera has to offer.
Saturn and its rings are not easy targets !
Posted 04 April 2013 - 06:19 AM
I upgraded my camera to a zwo as210mc and this was its first light. I hope I get better at this. Thanks for tweaking the image.
Posted 07 April 2013 - 12:54 PM
Anyway here is my result pretty much straight out of DSS other than cropping...total of 312 frames of 25 sec each (over 2 hours of data) @ISO 1600 prime focus 8SE using Canon 1D MarkIV DSLR:
Posted 07 April 2013 - 12:56 PM
Posted 07 April 2013 - 01:53 PM
Actually after the stretch, I see a great improvement. I do see a little noise creeping in. I believe the correction for that is more frames to stack and adding some darks. Or, from what I read from the "pros" maybe cut down on the ISO a bit. But all in all, I like it!
Posted 07 April 2013 - 02:28 PM
Posted 07 April 2013 - 06:04 PM
Posted 10 April 2013 - 11:10 PM
Here's my shot at M42. No darks or flats (well, I reused darks from another night; no flats). Taken during our club's recent Messier event, which was pretty much clouded out. 24 shots on ISO1600/30 seconds; only 3 were stackable(!). But M42 is such a bright target--in retrospect, I would probably have been better off with 5 or 6 second exposures. Minimal processing in DSS; then, just RGB level adjustments in Photoshop Elements before export to jpg format. The photo has been lightly cropped. This time, I did not use the f/6.3 reducer.
Posted 11 April 2013 - 03:44 AM
Your second image of M81, Joe, has indeed brought those more tenuous outer edges of the galaxy to prominence ! :bow:
And, despite your self criticism of the technique you used in this case, htd, you've certainly managed to keep the "Trapezium" intact with no overexposure. :bow:
Put them back on the "drawing board", though. You'll see: if you just "mess" a little further with what you both have here, you'll bring out even greater detail in both images !
Best regards to you both,
Posted 11 April 2013 - 06:45 AM
Posted 11 April 2013 - 09:11 PM
Posted 12 April 2013 - 03:43 AM
Looking good ! :bow: and thank you ! I'm glad to have provided a little motivation for you to push that "data full" image a little further ! :bow:
As to final presentation; (irrespective of subject matter), this is, of course as it should be, entirely the choice of the originator.
For my part in presenting your M81, (above) I did as I usually do from pure interest in the original, and that was to seek a universally accepted visual representation of this particular celestial object and then attempt to copy it from the data available in your image !
In this instance I used the image of M81 as displayed by Wikipedia !
Posted 12 April 2013 - 05:24 AM
Posted 12 April 2013 - 05:33 AM
The credit is all Joe's !
Posted 13 April 2013 - 08:46 PM