Jump to content


Image rotation with focussing

Recommended Posts

Hi all, 

Just a quick question that I can’t quite get my head around.  When I rotate the scope end to focus on stars for guiding, the image on SharpCap rotates as well. I don’t really understand how this can happen? The camera sensor doesn’t rotate and surely the lens is just being a lens, so it can’t twist the light through it?

It doesn’t matter too much, but if I use PHD2 for focussing help, I have to click on the same star each time I try to focus, as it’s moved and PHD2 doesn’t know where it is any more. 

Kit is ASI120MM-S and ASI mini guide scope.  


Link to comment
Share on other sites

Does it really rotate in sync with focusing, or does it just move a little?
The latter maybe due to bad collimation...

But once focused the problem is gone. Only have to do that once, for guiding is not critical on focusing. Slightly off focus even works better.


Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.