Jump to content
  • Join the online East Midlands astronomy club today!

    With active forums, two dark sites and a knowledgeable membership, East Midlands Stargazers has something for everyone.

Been out in shed tonight


Recommended Posts

I'm making an extension for the 132 OTA

as I'm not happy with the 2 x2" ext tubes

Found a piece of stainless tube 41/2" long and 51/2 dia been cleaning it up and making it round, its quite surprising how out of round this tube was

I've just come in as I'm feeling a bit cold and a bit thirsty, well it is 2am

will get it threaded later today I hope

Link to comment
Share on other sites

Excuse my ignorance Steve (still new to all this modding of scopes business - lol) why do you need an extension for your OTA?

Link to comment
Share on other sites

Modern refractors are designed to be used with large diagonals and bino viewers

This means that the focus point is way outside the OTA and needs extension tubes for CCD's and cameras to reach focus,because of the extension tubes you are putting more load on the focuser so it tends to sag more and can upset the focus across the field of the CCD

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.