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Messages - jkmorse

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1
General / 11002 vs 6303E
« on: 2018 September 04 15:30:20 »
Hey folks,

I have been shooting with an SBIG STXL 6303E for some time now and while it has great sensitivity, dealing with the blooms is, frankly, a royal pain in the behind.  Since I am not and will not be doing astrometry, using a CCD with an anti-blooming gate is not really an issue.  In order to control costs, I want to stay in SBIG’s STXL line so I can use the same filters, filter wheel and AOX set up.  That means I am looking at the 11002, mainly due to chip and pixel size.

Can folks who use the 11002 give me their thoughts and also would love to hear from anyone who has experience with a direct comparison.

Thanks all,

Jim

2
General / Re: Where did arcsinh stretch go?
« on: 2018 September 03 19:47:35 »
Duh,  My god it sucks getting older  :o

3
General / Where did arcsinh stretch go?
« on: 2018 September 02 18:27:05 »
Can't seem to find the link any longer.  Is it still available?

Thanks,

Jim

4
Off-topic / Re: New scope recommendations
« on: 2018 August 28 17:49:57 »
Too bad I am as behind answering your note as I am updating the website  :o

5
Off-topic / Re: New scope recommendations
« on: 2018 July 12 16:28:09 »
Yep, and the one I meant is only $3000.  Check out the images listed as "Older Images" as you scroll down on my opening webpage at http://jimmorse-astronomy.com/.  The first 7 of those were shot using the 130D Astrograph as well as M42 and the Pieiades further down a bit.  Its a beauty. 

Best, Jim

6
Off-topic / Re: New scope recommendations
« on: 2018 July 10 16:03:03 »
John,

I would seriously give a look to adding a Takahashi 130ed to your list.  It is a superb scope and right in your price range.  And at f/3.3, it is also super fast for astrophotography.

Best,

Jim

7
General / Re: Glitch in DBE
« on: 2018 April 13 18:31:08 »
A couple of points.  On DBE controls, when you rotate through the squares, there are two arrow controls.  One, with 1 arrow, moves you 1 square at a time.  The double arrow jumps you 20.  You must be using the double arrow by mistake.

As to nebulosity, you definitely do need to avoid the dust clouds, unless they are truly black.  Otherwise you risk losing lots of detail in the subtle nebulosity.  One way to avoid the problem is to do a maximum STF stretch so you can see the nebulosity more clearly so you can avoid it.  Also, remember, you don't need many points for a good DBE solution unless you are dealing with serious light pollution gradients.  I typically only place a couple in each corner and a few others dispersed around the rest of the image.  More is definitely not better when using DBE.

Best,

Jim 

8
General / Re: GREEN Channel Vertical Banding
« on: 2018 March 25 14:58:43 »
Just for an experiment, try aligning the green subs WITHOUT calibrating them first.  I know that sounds crazy but I bet it "fixes" the problem.  If it does then we have a different direction to investigate.  I sometimes run into just this problem with narrowband images and simply have to do a work around of ImageCalibration by cleaning up the subs/image with CosmeticCorrection, ImageIntegration, and DBE.

Let me know if that helps at all.

Jim

9
General / Re: GREEN Channel Vertical Banding
« on: 2018 March 25 11:31:30 »
Bill,

First, that is more than vertical banding, but some kind of matrix grid affecting your Green channel.  Am I correct in assuming that you are star aligning each color separately?  If so, one thing to try is using the recommended method of star aligning all subs from all colors in the same run (its always best to minimize the number of times you run star alignment due to the distortions it can introduce).  Try doing that using a red or blue sub as the master and see what happens.

Best,

Jim 

10
General / Re: The blue filter...
« on: 2018 March 25 11:26:05 »
I think most people shoot all RGBs the same length.  That said, you need to adapt to your own sky and adjust as necessary.  You did not say what you were shooting.  Is it a target with weak blues to begin with?  What's your light pollution like?

Best,

Jim

11
Bug Reports / Re: Problems in newly created Dark Masters
« on: 2018 February 08 12:02:25 »
Thanks Juan.  Its just strange that my 2016 Dark works fine but the new 2018 dark is a bust.

12
Bug Reports / Problems in newly created Dark Masters
« on: 2018 February 05 16:01:25 »
Juan et al.,

Up until 2 years ago I had issues with the way MaximDL writes FITS files.  The problem was that it often truncated the image to only 32,000 bits instead of the normal 65,000; thereby trashing all of the higher end signal.  By working out the exact settings in MaximDL to avoid the problem, it went away. 

But lately it’s made a comeback of sorts.  RGB images are fine, so far, I am guessing because they have stars that fall into the upper range even before stretching.  But my narrowband images are a mess.  I can do a work around since the issue materializes when I calibrate my subs so if I skip calibration I can still use the files, but that is not ideal.

I have tracked the problem to some newly created master darks.  Something in the way PI is writing the master darks under 1.8.5 (at least since mid-January when I took the darksubs and made the masterdark) is reintroducing the problem.  Attached is a file including everything you should need to test the problem, including new and old master darks, other calibration frames, and new darksubs, as well as a set of 18 OIII subs:

https://www.dropbox.com/sh/q1bum458ba460tk/AABAlbPbOh03cRQU2xhWThJfa?dl=0

I am using the latest version of PI for Windows and an up to date Windows 10 computer.  Let me know if you need anything else.

Thanks,

Jim

13
General / Re: Calibration Issues
« on: 2018 January 17 15:24:30 »
I actually think your calibration turned out just fine.  Clearly the calibrated is far superior.  I think the calibration simply brought out hot pixels that were there all along.  To the extent hot pixels were added, it is much more likely to be coming from your masterdark, especially if your temp wasn't the same on both the dark and the main image.  Another issue may be that you used both the masterdark and the bias when calibrating.  Since your dark already has the bias built in, you do not need to include it when calibrating your main image.

Finally, even with the hot pixels you see, all of those can easily be dealt with using cosmic calibration and, ultimately, ImageIntegration.  And to repeat, I don't see much wrong with the calibrated image in the first place.

Hope that helps.

Jim

14
General / Re: Format output in image calibration
« on: 2017 December 16 18:39:30 »
Giulio,

Click on the "Edit" button on the top left, then click on "Global Preferences".  About 5 items down, you will find "File I/O Settings".  Click on it.  There, under "Default Save As image file extension" change the file type to ".xisf"

That should do it.

Best,

Jim

15
Release Information / Re: New in PixInsight 1.8.5: FrameAdaptation
« on: 2017 December 16 18:28:39 »
Thanks,

Will give that a shot and report back.  Could be a few days since I am well under way on a five panel mosaic of the Double Cluster.

Best,

Jim

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