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robindurant

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Posts posted by robindurant

  1. I have an iOptron Sky Guider n which I mount a DSLR, when aiming at an object and finding it needs small adjustment for correct framing I move it by hand, usually too much, this takes time , the Mount has a facilty for small movement in one direction only, Is there a Micro adjuster that I can attach to the mount and camera to make this easier, I have seen one that has two control knobs

  2. Here are 3 images - single shot - grad x treminator to flatten and stretched with levels. it looks lop sided to the left and uneven stars. If I continue a light spot appears in the centre ?

    single frame 2.jpg

    single frame.jpg

    single frame 3.jpg

  3. 13 minutes ago, michael8554 said:

    If it's not on your Flats, it is on the lens or sensor.

    Is your mod Ha or Full Spectrum ?

    If Ha, then the #LPF-1  I.R. and Sensor Cleaning filter remains, so you can't clean the sensor, only the filter.

    Did you clean with a puffer, or with the Sensor cleaning function ?

    As Peter suggested a daytime AV image of a plain background with the stock 18-55mm should eliminate the Samyung.

    Michael

     

    The Mod was just to remove the i/r filter not full spectrum I believe. Ive had this done with other Canons twith no problems . I cleaned with a Sensor Cleaning Swab and after a air blower. I have tested the Samyang on another DSLR and it works fine so its a camera problem

  4. 2 hours ago, PeterCPC said:

    Have you tried to repeat the problem by taking daylight images against a plain background?

    Here are 3 images - single shot - 10 second single frame and 10 second stretched on levels and curves trying to detect a problem

    image 1 single.jpg

    image 2 single 10 sec stretches .jpg

    image 2 stretched 10 sec.jpg

  5. 1 hour ago, gajjer said:

    Just a thought, but might it be on one of your flats? What happens when you stretch without either darks or flats?

    cheers

    gaj

    Have tried stacking with and without flats and darks, just the same

  6. Can anyone help me, I have a Canon 5dMk2 which is assto modded but cannot obtain a good image using my Samyang 14mm 2.8 lens, I have attached two images which I have processed to accentuate the problem , one stacked DSS and one Sequator , both show the same probem. I have cleaned the Sensor so dont know what that bottom right artefact is. Both images were stacked with Darks and Flats and captured at - 20 x 15 secs iso 3200 f2.8

    image 1.jpg

    imag 2.jpg

  7. 19 hours ago, jambouk said:

    Are you using a 2” or 1.25” nose piece? If the latter use the former; if the former a focal reducer may help, though may introduce other issues. It is a massive sensor so I think you are always going to get some vignetting. Flats will help.

    I’m using a 2”

     

     

     

  8. 13 hours ago, happy-kat said:

    If you take an exposure on a static mount of say 5 seconds can you see the same elongation bias on one side, take the same again but no filter, do they compare in elongation bias. I guess aim true east or west 30• to give a control position.

    How do you know it's not the optics?

    Just thinking of what I'd do to see what was contributing.

    Hi single shots even at 30 secs are OK and Ive checked and cleaned all the optics

  9. I have attached 2 images from last night using an H-Apha filter due to the Moon being up, however the target was well away from it and should according to the Filter specifacation not effect Ha imaging.

    I reduced the exposure to 60 seconds as suggested by many and set iso at 3200 ( grainy but a good setting for accenting  the problem) 10 and 5 exposures, stacked them with Deepskystacker, part processed on PS .  As you will see it has made no difference whatsoever to the rotating marking or smearing effect

    I have checked the optics in the Scope and the DSLR

    Could this be a camera sensor fault or dodgy DSS software, although it stacks with no effort.

    I have tried every settng on "Preference" on DSS inclusing the ones for Ha images, makes no difference

    Im now at a loss as to what to try next

    ROTATION 1.jpg

    ROTATIon 2.jpg

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