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alcol620

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About alcol620

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  1. adding more images

    Thanks folks I have had a go at combining two sets of images using Pixinsight, I registered the images firstly against an image from the set taken last year with an Atik 383 camera on a ED80 scope and secondly against an image from a recent set taken with an ASI1600 mono camera on a TSAPO60 scope. Each registered set was integrated and the two images are shown. Obviously a significant difference in FOV of the 2 images, but it does show as you said, that images of different set ups can be registered and stacked, albeit, stacking images against the wide field registration does lead to a brighter area in the centre of the image where the extra data is intergrated Any ideas on how you would get rid of this, I have tried a quick histogramtransformation and curves but the bright area does not blend in. Perhaps with differing field of view you can only overlay the wider field onto the smaller?? Comments welcome
  2. adding more images

    A simple question that I am unsure of the answer.I took 20 of images of M31 a few weeks ago, calibrated them and integrated them into an image (say image A). If I take more images of M31, same setting, and calibrate them, can I register them and integrate these addition images directly with Image A or do I integrate them with the original 20 calibrated images?Thanks for your help.
  3. Thanks Alan, very helpful insight. I am surprised at the lack of input from others who have taken wide field mosaics. Thanks for your interest. Regards Alec
  4. Hi Symmetal and others. No replies/feedback as yet on SGPro Forum on adjusting camera rotation to adjust for sky curvature despite posting in a couple of places.
  5. Interesting Symmetal thanks. No response from SGPro forum yet. However, I found this reference that suggests that SGPro does not allow rotational adjustment between mosaic sections, but some one at Pixinsight has written a script that will allow this to happen. (At least I think that is what it means?) See Bhwolf Oct '15 I saw Andres in the PixInsight forum has a really cool script for PI to do mosaic planning. One such feature is adjusting camera rotation to compensate for sky curvature, as you can see in his post here: http://pixinsight.com/forum/index.php?topic=9057.msg58578#msg5857819 While it would require a rotator (in most cases) and may only be needed in widefield, it seemed like a good idea so thought I'd mention it here as a possible enhancement to the
  6. Interesting Symmetal thanks. No response from SGPro forum yet. However, I found this reference that suggests that SGPro does not allow rotational adjustment between mosaic sections, but some one at Pixinsight has written a script that will allow this to happen. (At least I think that is what it means?) See Bhwolf Oct '15 I saw Andres in the PixInsight forum has a really cool script for PI to do mosaic planning. One such feature is adjusting camera rotation to compensate for sky curvature, as you can see in his post here: http://pixinsight.com/forum/index.php?topic=9057.msg58578#msg5857819 While it would require a rotator (in most cases) and may only be needed in widefield, it seemed like a good idea so thought I'd mention it here as a possible enhancement to the F&M wizard...
  7. Hi Many thanks for taking the time to explain in detail what is going on. I now have a much better understanding of the mechanics. I have posted a link to this discussion on the SGPro forum in the hope that the developers will have a view on how the Wizard functions and whether there is a need to modify it to take account of RA rotation between panels. Thanks again for your detailed feedback - very helpful Alcol
  8. Checked the images this morning and the same result, with about 6 degrees of rotation not picked up by the plate solver. Presumably something I am missing?
  9. Hi folks Just did a quick run off the 2 part IC1848, Set the sequence running, plate solve started and asked that the camera be rotated by 90 degrees, I had just completed a run on a different image, I manually rotated the camera, (several times until plate solve was happy that it was within the 0.5 tolerance that I had set. The sequence then took the requested images of IC1848-1 and slewed to the next part of the mosaic IC1848-2, plate solve started up and checked the position and reported that the camera was at 0.2" within the 0.5 tolerance set and required no rotation of the camera before it went on to complete the plate solve and SGPro then went on to take the images of IC1848-2 As far as I could see I had set all the required settings for plate solve to set the camera rotation position before taking images. Presumably for manual rotation there is no requirement to make entries in the SGPro Control Panel Manual Rotator setting? Any ideas why the plate solver is not picking up the rotation in the second image (see the images posted earlier in this thread)?
  10. Thanks Symmetal Very helpful, all much clearer now. I thought I had these settings set (although with all the settings required in SGPro it is possible that they were not). When I ran the sequence for the first image it ran plate solve and requested manual rotation of the camera, which I did, and it took the images. When it went on automatically to move to the second image in the sequence it plate solved again and it came up with a rotation error of less than 1 degree (within the tolerance I set so no manual rotation required) and went on to completed the solve and take the 2nd image. Hope to get out tonight and check all this more carefully. I will report back - thanks again
  11. Thanks. As you can see I used the manual rotator and was using a 15% overlap on the images and that wasn't enough. I thought that the Manual rotator did the same job as the mechanical rotator? Presumably using the TSAPO 60mm scope which gives a wide FOV means that the RA rotation will be significantly greater than if using a scope/camera combination with smaller FOV? I was under the impression that SGPro Mosaic Wizard would take care of the rotation as when it plate solves it tells me how much to rotate the camera to, before starting to take the images?
  12. Thanks for the explanation. makes a bit more sense now. However, I thought SGPro's Framing and Mosaic Wizard took account of all this to allow mosaic's to be a simple process. It never suggests that you need anything much more than 10 - 15% overlap to be able to combine images. With the sort of rotation seen here that % would have to be significantly higher and then when cropped large area of the image are lost.
  13. Yes all on the same side of the meridian, images within minutes of each other. Can't get my head round where the rotation comes from!
  14. Hi folks Desperately in need of some advice/help. I have been trying to get a 2 part mosaic of IC1848 Heart & Soul nebula, but the end result when pulling the 2 images together is two frames well out of alignment. Not sure why, I think I have followed the SGPro process using the Framing and Mosaic Wizard. My process was as follows: Opened the Wizard Typed in the Object as IC1848, did a fetch. Image arrived and I drew a rectangle around it having set rotate selection as 180 degrees to get the image where I wanted it, set camera tiles as 2 x 1. See the image attached with appropriate overlap. Clicked "Create Sequence" ( ticked "auto rotate or validate rotation on mosaic start" and Precision centering with plate solve") The Sequence was produced with 2 parts IC1848-1 and IC1848-2 The coordinates for the 2 images shown in the sequence were (IC1848-1) 02 29 12.73s 60 06 19.70s and (IC1848-2) 02 58 04.11s 60 57 52.41s I started the Sequence and SGPro duly ran the Plate solver and asked me to manually rotate the camera until it aligned with the camera angle selection. A number of IC1848-1 images were taken. SGPro then moved on to the second image in the sequence IC1848-2 and did a plate solve no requirement to rotate the camera as it was found to be in the correct position. SGPro then took images of IC1848-2. The 2 images obtained are attached for ingormation However, when I combined these 2 images using Pixinsight's creating a rough mosaic with Star Alignment, they did not line up and indicated rotation. See the attached image (It is a very rough image as on 1x300s subs have been used to quickly test whether the 2 images aligned). I have repeated this process twice with the same result. Very grateful for any feedback if anyone can see where I am going wrong. Thanks alcol
  15. Hi Folks I am trying to get to grips with the wonders of SGPro and I would appreciate some feedback that clarifies what the manual rotate settings mean. I am running a TSAPO60 scope and have to be careful slewing as the filter wheel gets very near to the mount and leaves not a lot of adjustment on the scope rotator to turn it to the required position. I am trying to set up for a mosaic and want to be able to get back to the same camera angle if I take further subs after the camera position has been disturbed. I have read the SGPro help files and checked on the forum but can't get it clear in my head what the rotate angle actually mean in practical terms. Do they relate to the angle of the camera when in the park position or the angle of the camera when fixed on a target, what changes when you put different values into the SGPro control panel. Any clarification, in the simplest terms possible, would be appreciated. Note: I am only using the manual rotate facility. Thanks
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