Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Topics - Cleon_Wells

Pages: [1] 2
1
Off-topic / How not to capture images of the Transit
« on: 2012 June 06 12:37:40 »
I thought some of you may get a hoot out of my crude setup to capture some of the Transit. My set up used a C8 a 32mm Eyepiece an old projector screen and my T2i_3200_iso100_F 4.5.
I couldn’t get the screen square to the eyepiece because the sun would shine on the screen.
Cleon

2
Bug Reports / PI launches on Mac reboot
« on: 2012 May 09 19:22:44 »
When I start or reboot my MacBook/10.6.8, Pi -.0793 launches, the startupitem folder is empty.
Cleon

3
Off-topic / Where to report a Star flare up?
« on: 2012 January 15 10:27:17 »
Check this image out showing a star flare up in the field of view of my two  ngc7635 images, separated by 101 days, (10/2/11-01/10/12). The changing Low Pixel Rejection maps are from subs that I acquired on 01/10/12. These subs are 120sec with a 5sec separation, I combined the first ten subs and integrated with Region of Interest (Preview Window 01), I then removed the first 4 subs and added the next four subs, keeping the total integration to 10 subs for each of the 11 Integrations.
Cleon

4
Bug Reports / Dark calibrated sub Integration
« on: 2011 December 19 10:33:29 »
I think there’s something wrong when creating a MasterDark with  Image Integration and Dark Calibrated subs on an Apple computer compared to using a Windows computer. I’ve attached a screen shoot showing the difference between a Debayered AppleMasterDark created on the Apple and a Debayered WinMasterDark created on a Windows 7 Dell, showing how these two MasterDarks calibrate a single Dark sub # 0612. This screen shoot show on the left side of the screen the two Debayered MasterDarks and on the right a single  Dark sub, note the difference in pixel levels.
I followed these instruction,
http://www.astrofoto.es/Adler/Documentation/Calibration/Calibration.xpsm2
I used my Canon T1i CR2 files, the Bias subs (41 total) are at 1/4000 and iso100, the (14) Dark subs are 120sec and iso400. The first Windows test started with the CR2 files, creating/Image integration a WinMasterBias from 41 .fit converted CR2 files and then Calibrating the 14 Dark CR2 subs, to create with Image Integration a WinMasterDark. I then proceeded to Calibrate a Light and a Dark sub. This Windows test worked properly, I then used an  Apple MasterBias for Calibration on the Windows computer with success, I then used  the 14 Apple Dark Calibrated sub on the Windows computer to create a second Windows MasterDark , this new Windows/Apple MasterDark  worked properly for Calibrating on the Windows computer. When I tried to use the Apple MasterDark on the Windows computer the Calibration of the Light and Dark subs was defective, if I used the WinMasterDark on my Apple computer for Calibrating these same two subs the Calibration worked properly .
 Check this link.
http://pixinsight.com/forum/index.php?topic=3671.0
Cleon
PS I corrected my Screen shoot of the AppleMasterDark

5
General / Calibration of Dark subs
« on: 2011 December 15 04:45:20 »
      To Be or Not to BE,  Dark sub Calibration


Astropixel did a great job in collecting/summarizing the document from the Adler Planetarium  workshop on Calibration.

“ Calibrating the Dark Frames
Once we have the master bias image, we can subtract the bias pedestal from the dark and flat frames. “

from this link

http://www.astrofoto.es/Adler/Documentation/Calibration/Calibration.xpsm
“ As we are going to subtract the master bias pedestal to the dark frames, only the section must be activated “

Correct (I think) Master Dark creation
http://www.pixinsight.com/tutorials/master-frames/en.html

Can we come to an agreement on MasterDark creation for DSLR imaging?

6
General / DSLR MasterDark creation
« on: 2011 December 12 19:10:07 »
Attached is a screen shoot of sub 589 Calibrated with two different MasterDarks.
The upper left image used 15 calibrated dark subs that were integrated with a Pixel Rejection setting of, Winsorized Sigma clipping and no normalization . The lower right image used the same calibrated dark subs and integrated with a Pixel Reject setting of Winsorized Sigma an normalization of Scale+Zero offset. It’s interesting that both of these light calibrations had large Dark Scaling Factors (over 100.0). I don’t have a problem with these calibrated dark subs using  linear fit clipping and no normalization during integration or just integrating the uncalibrated dark fit files with WS and NoNorm and checking the calibrate box in the MasterDark section of ImageCalibration.
Cleon

7
General / Detailed Integration Documentation
« on: 2011 December 07 17:57:54 »
For those that haven't gone to    http://pixinsight.com/doc/tools/    , like me, check out
Juan's Reference Documentation on ImageIntegration.
Why doesn't the statement  "Normalization is an absolutely necessary previous step to pixel rejection" apply to calibrated dark subs?
Cleon

8
Bug Reports / MultiScaleMedianTransform
« on: 2011 November 02 18:01:29 »
This process on my Mac (i7-8gig) is very slow, it takes around 15 second to see a Bias change in the Preview window.
Cleon

9
General / 32 bit BatchFormatConversiion of raw Bias subs
« on: 2011 November 02 05:40:19 »
I created 40 new 32 bit Bias .fit sub with BatchFormatConversion set to (32bit IEEE 754 floating point) yesterday and integrated a new MasterBias, I also recalibrated my Dark and Flat subs with this new MasterBias and integrated a new Master, Dark and Flat file. The one measurable difference I see in IC , see attached image,  is the amount of the (master Flat scaling factor ) is slightly different and I also see a small improvement in HotPixel reduction in my Lights after Light Calibration. Is this a better way to do the BFC of the Bias sub or have I fooled myself with a error in my process?
      The attached image also points out the difference that temperature makes during IC in the Dark scaling factors. I used these Dark subs for this test because of the wide temperature change, ( C13 to C26 over 28 minutes), in my incorrect  acquiring of these 120 sec Darks. I assume the perfect Dark scaling factor is 1.000, I deduced my integrated MasterDark temperature from the IC Dark scaling factor numbers.

I still can’t use any Rejection during integration of the Dark_c subs and I even tried different Dark_c subs and still get large Dark scaling factors when calibrating with WS 4_3 rejection on. I have had success with Dark_c integration with WS 4-3 rejection in the past.
Cleon

10
Off-topic / Noise banding
« on: 2011 July 22 07:53:10 »
I think I fixed my banding noise problem by aligning the guide camera with the RA axis. I had not aligned the guide camera in this image of M51, check out the last image in this thread.

http://pixinsight.com/forum/index.php?topic=3105.0

For this test, I took a set of subs (24) the other night with temperatures around 90 degrees, the target was M63. Now I’ve got hot pixels that are not removed by integration but no banding noise. 8>)

11
General / DBE Symmetries
« on: 2011 June 19 13:01:24 »
So after creating my fluke Blue hue DBE image with to few samples, see the Bug section, DBE problem; I would like to know if anybody uses Symmetries and also why can you reposition the crosshairs that are created when you select the image?
Cleon

12
Bug Reports / 1.7 DBE problem
« on: 2011 June 11 18:18:58 »
64bit Build 697 on a MacBookPro i7
When I use DBE the control pane moves behind the HST pane when I select the image.  When I execute DBE the resulting image has a blue hue.
Cleon

13
General / subtle processing rings
« on: 2011 June 03 12:04:56 »
I took 41-120sec subs of M51 the other night with my 10”RC/Canon T1i, iso400 . I noticed after I did a quick PI processing (Hist_Trans and Curves) that I have subtle rings in the lower right hand corner of this image, the + is the center of the most predominate ring. I show the Master Flat and a single flat sub Calibrated,  the flats show the same lower right hand corner as the integrated master. What could cause this problem?
Cleon

14
Off-topic / Talk about a Field Trip
« on: 2011 May 08 06:34:34 »
Look at this link.
http://skysurvey.org/

15
General / What can rejection maps tell us?
« on: 2011 April 15 05:48:37 »
After my exciting discovery of three semisynchronous orbit satellites 8>) ; I wondered how many imagers take a detailed look at their rejection maps?
I would not have stumbled onto these three satellites trails without stretching the rejection_high image. It also just dawned on me that the fuss around the bright stars in the high rejection map is caused by poor seeing.
Cleon

Pages: [1] 2