Jump to content


Focus position of 294MC much further back than canon 1000D


Recommended Posts

The flange distance for a DSLR is 44mm+ t-ring so around 55mm, while with the 294 it will be (i think) 17.5mm + the thickness of whatever nosepiece you put on it (few mm more).

So nothing is wrong here, the sensor of a DSLR just sits much further back from the connection to the scope than a dedicated astro cam.

  • Like 1
Link to comment
Share on other sites

The have different back focus positions so need the focuser racked in/out more. When using a recuder, for example, you would note the back-focus needed and may have to add spacers for different cameras. A few use 55mm as it's standard for most DSLR but thoer cameras lke the 294 based ones would need spacers.

Does that asnwer the question or have I missing something?


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.