Pentax To Telescope

Have a nice telephoto lens? Want to use it like a telescope? Now you can! Works with 1.25" eyepieces (but not long barreled ones, like a 3x barlows). You'll have to use a lens that has manual aperture operation or find a way to keep the little lever open (use a little piece of tape etc).

V2 added a better eyepiece fit geometry, a fixed internal cavity, and a slightly shorter flange focal distance (my eyepieces would not reach focus)

You shouldn't need supports... I tried it and it went badly for the mating features :( A re-print without worked much better.