Originally Posted by savage 40
Here's what I did.. Take the camera apart and remove the lens.. Then (daylight hours) I focused the scope on a distant location like an antenna or light pole.. Then remove the eyepiece from the scope.. Place the camera ove the eyepiece socket moving it in and out while watching the laptop screen.. When it came into focus I looked to see how far away the camera needed to be from the socket and then proceeded to construct the tube for it.
I tried this a while back. I hadn't got enough length on the focuser to be able to get an image. I wanted to set up a guide scope. The focuser was wound right out and I still couldn't get a focused image.
I anticipated problems when fitting a webcam. Would I have to have a bigger range of adjustment ?
It turned out that I only needed to fit the camera onto a tube that just fitted into the eyepiece holder. Focusing on stars, the moon and Jupiter were easy. The camera focuses at nearly the same setting as a 40mm eyepiece.
Terrestrial objects needed a much longer focus tube than I have on my scope.
Had to resort to setting the guide scope up in the dark !