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About johneta

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    Star Forming

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    Dunedin, New Zealand

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  1. OK thanks for that. I had suspected something like that. Its a big ask I guess for a scope or lens to cover that big a sensor with min distortion and vignetting. I decided to stick with my crop sensor, driven mainly by my lack of good lenses to use with it.
  2. Hi I use a 550d (APSC) on an Orion 8" F3.9 which works well. Ive got the opportunity to get a full frame DSLR for Landscape etc and wondered if it would work well on my scope Has anyone used a full frame DSLR on this scope. Vignetting? More coma in corners? Thanks
  3. Ha I hear ya on the dragging the tracker up a hill. Its a commitment alright . Yeah I was considering the Tokina. Looks good, except I was put off by the corners. I saw some images where there was crazy coma in the corners. Stars looked very stretched and had wings! Looked like birds around the edge. Shame, cause the middle was nice and sharp. Also I had a peek at your widefield images, very nice . Particularly good foreground in your shots
  4. I use Siril now (I used to use DSS ). I usually take 4 x approx 2 minute static shots of the Landscape ( Stars have drifted of course) Then I turn the tracker on, and take around 14 x 3min images of the stars (Landscape is blurred). Then I stack the 4 land shots and process a bit. Then I stack the 14 star shots and process a bit. Now I merge them in Photoshop. Because of the sky rotation I have to crop it a bit, but there hasn't been too much movement in the sky over 40 mins or so. So although I've cropped and moved the sky part of the image a bit, the overall image
  5. Thanks. Yes Ive tried Sequator before and its fine, but I prefer other programs for the stacking. So you have done 14mm on FF -thats very wide indeed. Good to hear that it stacked well. Were they tracked images or static shots of shorter length (rule of 500 imaging) I normally aim for 14 x 3 min exposure on my kit 18-55mm lens (used at 18mm) Looks like I'll be OK to get a wider lens although the options are a bit limited for APSC - because I also wanted a zoom range ~10-20mm for daytime landscape photography as well.
  6. And to be clearer, Im talking about Landscapes (foreground mountain or Lake) with milky way in the shot
  7. Alignment before stacking?? I feed the images to DSS (previously) and it does the alignment. I guess you are talking about the more manual alignment as done in PI ??
  8. Thanks I'll try my older dithered data with Siril and see if it handles it first, and if Im not successful I'll put the images up. Note that when I say dithering, I mean huge dithering on my widefield On my usual deep sky rig I do dithering with APT and PHD2 as usual. But when I travel and do widefield I use my Stepper motor driven Scotch mount, so Dithering ( I use the term loosely) is me stopping between frames and moving the camera as small an amount as I can and then carry on tracking. Its pretty punk and ends up with large movements between shots, so if I was to be able to stack
  9. Thanks for clearing up the terminology and describing what I had a dim understanding of. I have used ICE before and yes its quite good but still struggles on edges of image. Plus I was hoping to capture the image in one go. I usually travel for my wide field shots and I get a few subs which takes time, and taking more for mosaics will make the already long night longer. I'll have a look at those softwares. Ive used APP before but only for deep sky. My experience with DSS has been that it doesnt stack dithered widefield images well. Thats what led me to my current process of no
  10. Hi I was looking at getting an ultra wide angle lens for my APSC canon. Then I wondered if I could successfully stack with it. The widest Ive stacked on is 18mm. Which works out well. It seems to get progressively harder the wider you go. Any movement between frames means you cant stack because of field curvature in the lens shifting the position of the stars in the outer corners of the image, meaning the stars wont line up in a stack. So dithering is out. This is the only setup I use darks in, to help a little with noise. So I'd love to hear from anyone who has success
  11. Hi Just thought I'd share this problem Ive mostly worked through. I was having problems with APT and my Canon DSLR (550d). Eg. On some imaging sessions I found that the first 20 images or so were right side up and then the last 10 were inverted. Not a huge problem as stacking programs will rotate them for you. But I saw an issue on a post where Flats were inverted compared to Lights, and of course the Flats did not work. -My problem was, when I manually framed a previous nights image with the framing tool,- then intermittently, the framing pattern was upside down. Also this in
  12. Hi. Yes APT does flip images. Disabling image rotation does not fix the issue(maybe different on some models but not on my 550d) I was on their forum and the thread is here. https://aptforum.com/phpbb/viewtopic.php?f=5&t=1053 - go to the end to see the last few posts. They have mostly fixed the issue in version 3.86.7. In order to update your version just google- Astro Photography Tool beta 3.86.7 and install it. The orientation of the camera was not being properly read off the RAW images but interestingly was OK on JPEGs (the initial workaround was to capture images in RAW+J
  13. Similar to 'wornish' manual alignment procedure. You can also try File, Scripts, Load Files into Stack. Then browse to the 2 images and load them. Then check "Attemt to Automatically align source images" and hit OK. It will load both images as 2 layers and most times they will be aligned very well. Do the 50% opacity technique as above to see if they are.
  14. You mention having stuck to the same tutorial and techniques over the first year of processing. Look around alot more than that. Watch a whole lot more tutorials to inspire you, and I found I just focus on one issue at a time. Having trouble with colour in image - search that, and solve that issue. Then move on,- best way to use curves. Or getting background colour balanced. Read widely Also, I used DSS for ages but was never happy with it. Pixinsight is great but I now use 'Siril' for stacking and initial processing because I'm cheap (its free) and it is very good IMO.
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