|
Sounds like tilt. If the corners were good originally and now have developed elongations in the corners without changing anything from before it sounds like tilt.
You need to get the imaging train square again.
That is best done by packing out the corners to get it square with thin packing material. I used brass shim from a metal supplier to do it.
First though you need to ascertain which corner of the image relates to which corner of your camera otherwise its a lot harder to adjust for this.
I take a short photo with a dimmed torch lighting up the top or the bottom and see where the light is in the resulting image. Is it the same or reversed ie shine a torch at the top of the scope but it shows on the bottom of the image = top and bottom are reversed. I always orient from standing behind the camera looking at it in front.
Do the same for left and right.
For a mirrored scope its usually reversed top and bottom. For a refractor I am not sure.
Now pack out the corner that is worst and take another quick photo and examine.
Back and forth until it is corrected. It can take a while unfortunately.
Once you nail it take notes about what was needed for future reference in case you remove the camera etc.
Judging by your images I'd say you are a fair way away from being square. It will need probably .5mm packing or so, perhaps more.
Greg.
|