Camera Lens Bahtinov Mask

Just got an idea to try the Bahtinov mask on my Tair 3S telephoto lens on the CN forum. As I had in mind 3D printing of the front camera attachment for the solar filter anyway, I decided to print the mask instead of just an ordinary ring as I usually do in order to get the perfect snug fit.

Even though painting it black should improve testing it works very well as is.

GSO-based two speed crayford focuser info

This is my focuser. The link under the image goes to the great instructions on its disassembly and tuning.

Meade ETX-125 Focuser mod.

My oldest telescope Meade ETX-125 focuser modification project (published a decade ago on Instructables):

In addition to improving the smoothness of the focuser motion, this mod allows setting the scope into a perfect focus by dialing a value from the list of settings for each of my eyepieces and camera backs. That's also helpful for arranging exposures with the rear mounted camera while tuning the perfect focal position from test shots' analysis.  See it in full details on the Instructables website.