Camera image view changing?

[tooth_dr]

How is it possible that my image is now off centre on the horizontal plane? ZWO 120MM with 1.55mm F2.0 lens

23rd March

27th March

 

 

Edited March 28, 2021 by tooth_dr

[masjstovel]

Im the opposite of an expert, and i dont have lenses that wide, but was just thinking of something.
I dont mean it offensive at all, and you have most likely control of  it since you made the post; you are pointing in the same place in the sky?
Since the lens is so wide and since you can see the horizon++ in all sides, it is acutally difficult to see.

Anyway, what i was thinking about, was, how does the vignetting of a flat frame look like? Is the vignetting also "offset"? 

[tooth_dr]

5 minutes ago, masjstovel said:

Im the opposite of an expert, and i dont have lenses that wide, but was just thinking of something.
I dont mean it offensive at all, and you have most likely control of  it since you made the post; you are pointing in the same place in the sky?
Since the lens is so wide and since you can see the horizon++ in all sides, it is acutally difficult to see.

Anyway, what i was thinking about, was, how does the vignetting of a flat frame look like? Is the vignetting also "offset"? 

Thanks for the reply. It’s a fixed installation that can’t move.  If you see on the left side of the second image I now have cut off the FOV 

[masjstovel]

Ah, then i understand more why/what youre asking :D. Sorry, i should have known better!

Yes, i see the whole frame is panned to the right. Less on the left, more on the right, so thats why i asked. Was thinking a flat frame would illustrate/reveal the problem bette rif it was some misalignment/uncollimation between sensor and lens

Edited March 28, 2021 by masjstovel

[paul mc c]

Could it be slight movement,swelling or flexture caused by what ever the camera is mounted on.

[tooth_dr]

@paul mc c @masjstovel  I screwed off the dome part of the camera housing, and found that the lens was loose on the camera, just a 1/16 of turn.  This had caused the vignetting.  The only thing I did was turn on the heater between the above photos, but that looks like it was enough to cause it to loosen.  I have noticed that my camera temp is 33 deg C now whereas before it was 10 degrees or less.   The heater is 2.8W and it says to run on full power.   Ive attached a new photo from a few minutes ago.  Thank you both for your input.

 

Edited March 28, 2021 by tooth_dr