I believe I have a collimation issue with my Tak FS-102 (Fluorite Doublet).
There is a definite blurring/elongation of stars towards the bottom left corner of the frame in my images. It is evident with and without the focal reducer, and can be seen on images taken with my previous DSLR and my new CCD camera. I've run the images through CCD inspector and it says there is a tilt towards that corner of the frame.
It can be seen if you zoom in on the bottom left corner of this high res image of eta Carina -
link
Does anyone have any experience with this particular scope? I haven't found anything specific on the web, only general advice about collimating a refractor.
I have attached two pictures of the front element and the adjusting screws - there are three sets of screws around the objective. The black objective housing is hard against the blue front end of the main tube at the top of the scope, but there is a definite gap on the underside.
For clarity, could people refer to the screws as the short screws and long screws when giving advice please.
Thanks in advance.
DT