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- Latest Member: ivalies
||December 12, 2013, 02:47:49 AM|
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Messages - Craig & Tammy
« on: December 11, 2013, 01:47:21 PM »
Thanks guys. Mike - just couldn't go longer here at home. There is actually a tad more signal that could have been brought out, but the "ugly" comes out with it :-( We elected to be a little more conservative and keep it as clean as possible. There were horrible gradients that PI's DBE took care of (not without some effort though) and a good amount of noise reduction. I really don't know why the data was so awful but we did the best we could with it.
Thanks for looking.
« on: December 09, 2013, 03:29:33 PM »
We have had this since April and must have processed it a dozen times. In truth, it wasn’t the best data, but we hated to leave it un processed. After gaining some experience with PixInsight, we decided to tackle it one more time and finally came up with an acceptable result. This is NGC3521, The Bubble Galaxy in Leo. Taken with our Stellarvue SVR105 & Atik 314L+
Full details by clicking the image. Thanks for looking!
« on: November 28, 2013, 09:02:29 PM »
Happy Thanksgiving to you, Eric! Hope you had a great day and didn't eat too much :-)
Happy Turkey Day to you, David!!
I hope all of our friends here at ECA had a great Thanksgiving holiday.
Best wishes to all of you!
« on: November 28, 2013, 09:01:00 PM »
Excellent image Bob! We shot this some years ago with a DSLR...sure was tough!! We should revisit it...
You are having fun with that lens!
« on: November 24, 2013, 09:44:28 AM »
Outstanding Bob! That's the same lens model we have :) Strange, but as big as the image circle is, you still need to stop it down to get round stars in the corners. Once you do that, they are dead round! I think ours were still a little wonky at f/4 - you may be OK, so definitely try it.
« on: November 18, 2013, 07:26:04 PM »
Based on what I'm seeing, I suspect the flats are the problem. How did you take them? They should be exposed to around 50% as shown on the on-screen histogram on the back of the camera. Looks like they are over-exposed and therefore giving you an over-correction. Try to calibrate & stack WITHOUT the flats and see what you get. That should confirm my suspicion. If the image basically looks like the inverse of your first one, then I believe that confirms the flats are the problem.
As for how many, well you will probably get as many different answers as there are members of this group :)
I will tell you what we do though. We generally get about 12 flats, 16 (or so) darks and at least twice as many bias as darks (we generally get 35).
Use some type of average to combine the darks & bias, and average or median for the flats.
« on: November 18, 2013, 08:50:06 AM »
Hi Sam - let's see if we can figure out what's going on.
First, I don't think I'd use "median" for combining the darks. I've always used some type of average for both darks & bias. A rejection method is ok for these to remove any stray outliers. Median can be used for flats. My first inclination is something went wrong with the flats. Could you post up the combined, stretched dark, bias & flat?
« on: November 17, 2013, 07:25:07 PM »
Agreed - excellent news!! Be nice for you to get back out under the stars and take some shots Jay! Looking forward to it!
« on: November 17, 2013, 07:23:51 PM »
Thanks Eric & Bob!
Can't wait to see your result Bob - I'm sure yours is a lot better than you are letting on ;-)
« on: November 17, 2013, 07:20:52 PM »
Thanks Eric. You are right - I think image processing is a never-ending learning curve.
« on: November 16, 2013, 10:43:27 AM »
« on: November 15, 2013, 02:31:43 PM »
Thanks David! Now that we've experienced these dark skies we can certainly appreciate them!
Thanks for the look!
« on: November 15, 2013, 09:49:10 AM »
Took the luminance for this image while we were at the Tennessee Fall Star Gaze at Fall Creek Falls State Park in Pikeville, TN. Friday night the SQM read 21.90 - literally the darkest skies we've gotten to experience to date. We had to dodge the clouds for a while until late (about 1:30 am) when the clouds took over for good. Saturday night was pretty much a repeat of Friday so we opted to get more luminance. We wound up having to get the RGB from here at home.
Full details by clicking the image
« on: November 15, 2013, 09:45:00 AM »
There were a couple things that we found on the PI forums too...one helps you determine the starting point for the edge protection param. Take a preview of part of the background (no nebulosity, no galaxy, etc.) and use the statistics tool to get the std dev of the background. Use that # as the starting point for edge protection param. The key to TGVD is the "dance" between edge protection & strength params. Takes some trial-and-error to get it right. Use HUGE changes to see what does what, but in reality, small adjustments are what you want.
« on: November 14, 2013, 08:07:52 PM »
Thanks Les, Bob!
@Les - we followed Warren's tutorial on TGVDenoise. Just takes some practice
« on: November 11, 2013, 09:58:27 AM »
Very cool image David! Loads of details! Can't wait to see the HST
« on: November 11, 2013, 09:56:37 AM »
Thanks guys! T spent over a week trying to learn TGVDenoise in PI. It's a great tool but (as with most everything in PI) can get a little complicated :)
« on: November 10, 2013, 10:25:38 AM »
We finally finished processing the image we started back on October 7. We were pleasantly surprised to have captured some of the tidal tails in the Quintet - especially given our mediocre skies here at home. Just makes us appreciate the dark skies we've gotten to experience as of late :)
Taken with our Stellarvue SVR105 and QSI583wsg. Click the image for full details.
« on: November 06, 2013, 09:12:17 AM »
Very cool Les. We tried this neb some time back...spent several hours on OIII and got virtually nothing
« on: November 05, 2013, 09:00:00 AM »
Thanks David!! Your image was outstanding!
« on: October 31, 2013, 01:25:19 PM »
Very nice images Tim!
« on: October 31, 2013, 01:22:40 PM »
Very nice images Suresh!
« on: October 31, 2013, 01:20:12 PM »
Awesome image David!! Glad you are getting some skies and having fun with the new camera!!
« on: October 31, 2013, 12:33:11 PM »
Thanks for looking Tim!
« on: October 31, 2013, 11:56:03 AM »
We'll get this going...
This is the Ghost of Cepheus we captured while on vacation at The Outer Banks, NC.
Telescope: Sky Watcher Quantum 120 Apo @ f/7
Accessories: SW Quantum matched flattener; Dew control by Dew Buster; Alnitak Flat-Man
Mount: Takahashi EM-200 Temma2
Camera: QSI583wsg CCD @ -10.0C
Guiding: Starlight Xpress Lodestar via PHD
Filters: Astrodon E-Series Gen II LRGB filters
Exposure: 28 x 15min. binned 1x1 Luminance; 6 x 10min. binned 2x2 in each R, G, & B
Acquisition: ImagesPlus 5.0 Camera Control
Processing: PixInsight 1.8; Adobe PhotoShop CS5; Noel Carboni’s Actions
Date(s): Oct. 1 & 2, 2013
SQM reading (begin - end): N1:20.97 – 21.04; N2:20.77 – 20.94
Temperature (begin - end): N1:67.0ºF – 68.0ºF; N2:73.0ºF – 72.0ºF
Capture conditions: N1 - transparency: Above Avg 4/5; seeing: Excellent 5/5; Very windy; N2 - transparency: Above Avg 4/5; seeing: Excellent 5/5; Very windy
Location: Camp Hatteras RV Resort, Rodanthe, NC, USA
« on: October 22, 2013, 09:48:07 PM »
Nice shot Dave!
« on: October 22, 2013, 09:44:51 PM »
Very cool David! I know you are glad to be back to imaging!!
« on: October 21, 2013, 10:33:45 AM »
Thanks Derek, Eric & Les!!
« on: October 18, 2013, 07:45:18 AM »