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Posts posted by robindurant
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20 minutes ago, happy-kat said:
Was that a can of air blower or a rubber hand air blower?
Can
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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
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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
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Hi , I have the dewdrop on images taken other nights so it cant be that and used flats to no effect
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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
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Hi again, is the tilt problem causing the larger stars on the left, whch way should I adust the tilt on my Redcap
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Thank you, most informative
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Has anyone an idea as to what these poor edges to my image is, Its not fully pocessed to show them. Im using a Redcat 51 with a Canon Full Frame 5DMk2 . I have a LP filter installed in the Camera
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No just when processed
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5 hours ago, david_taurus83 said:
Strange. I would expect the centre region to be brighter. It looks like whay happens when you apply incorrectly exposed flats. What scope was this with?
A Williams Optics z71
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It’s above
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5 hours ago, david_taurus83 said:
I use the 6D. Can you post up your result or is that it above?
That is it above
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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”
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I have acquired a Canon 5D MK 2 which vignettes badly when attached to my Telescopes, WO Z71 & SW 5” Mak I have tried an adjustable field flattener to no effect , I processed 20 subs last night and same darks, the result was rubbish
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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
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42 minutes ago, happy-kat said:
The effect is accentuated on the right hand side. Is that actually the top of the image when you took the images?
The image has not been turned it is as you see
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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
DSLR Micro adjustment
in Discussions - Mounts
Posted
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