PST Prism Alignment problem - assistance please if possible
Posted: Sat Dec 17, 2016 6:26 am
Hi All
my Pst has decided to put itself out of alignment - and I don't mean the parallel to the top alignment that people often talk about.
The prism seems to have shifted internally such that it moves from forward to back - i.e it is rocking left to right while in the slider. (I have not dropped it, but it does get a lot of use - long prom timelapse is my fav. thing to do as you may know - so maybe it is a wear problem)
I have attached the photos of the sun I get as a result of the prism being misaligned as well as a short video here https://vimeo.com/196057192 showing the alignment problem.
What i know so far is:"
The PST cover plate pushes the prism into alignment when it is screwed back in place - my problem is that when it is screwed back in place it pushes it back into the the 'out of alignment' position.
Obviously I have opened it up to look at it but I don't know how to detach the focusing screw to get a closer look and I don't want to do that in case I make the repair job harder for a professional. So far all i have done is take the cover plate off.
My question is - (outside of the obviously professional lads at Bintel in Sydney) has anyone seen this thing happen before? and does anyone in the forum have experience repairing this kind of problem. Do you place something behind the prism to prevent the cover pushing it out of alignment, or has something broken or worn out? (nothing fell out when i took off the cover plate). is it easy to repair?
Thanks so much in advance.
cheers
Karen
my Pst has decided to put itself out of alignment - and I don't mean the parallel to the top alignment that people often talk about.
The prism seems to have shifted internally such that it moves from forward to back - i.e it is rocking left to right while in the slider. (I have not dropped it, but it does get a lot of use - long prom timelapse is my fav. thing to do as you may know - so maybe it is a wear problem)
I have attached the photos of the sun I get as a result of the prism being misaligned as well as a short video here https://vimeo.com/196057192 showing the alignment problem.
What i know so far is:"
The PST cover plate pushes the prism into alignment when it is screwed back in place - my problem is that when it is screwed back in place it pushes it back into the the 'out of alignment' position.
Obviously I have opened it up to look at it but I don't know how to detach the focusing screw to get a closer look and I don't want to do that in case I make the repair job harder for a professional. So far all i have done is take the cover plate off.
My question is - (outside of the obviously professional lads at Bintel in Sydney) has anyone seen this thing happen before? and does anyone in the forum have experience repairing this kind of problem. Do you place something behind the prism to prevent the cover pushing it out of alignment, or has something broken or worn out? (nothing fell out when i took off the cover plate). is it easy to repair?
Thanks so much in advance.
cheers
Karen