I have an old Unitron focuser on my 5" f15 refractor. Some may be familiar with this focuser...it has a long inside threaded draw tube with an OD of 1 3/8". I don't know what the inside thread size is, but into this thread fits a reversible eyepiece adapter that can fit either 1.25" or the smaller size. The problem with this arrangement is that the eyepieces only pressure fit into the holder, thus heavier equipment, like a binoviewer, cameras, etc, bend down, or pull out. In addition the eyepiece tube itself is probably 2X as long as necessary (for the 1.25" eyepieces)., but perhaps necessary for a long barlow.
My question, does anybody know of an adapter that might screw into the draw tube directly (for 1.25" eyepieces) that is short and has a screw to securely lock in the eyepiece?
Thanks for any help!
My question, does anybody know of an adapter that might screw into the draw tube directly (for 1.25" eyepieces) that is short and has a screw to securely lock in the eyepiece?
Thanks for any help!
Attached Image:
