Originally posted by mee Are there any guides to using a Pentax DSLR with a telescope? As in a simplistic how-to of all the equipment required to mount and use a telescope with the camera? I have an Orion telescope and I have a Pentax DSLR.. would be super to be able to use them together.. even if only looking at the moon or bright stars.
I am investigating this now. Two main forms of photography are possible with any DSLR.
1 is called Prime-Focus photography and means you attach the camera directly to the scope without an eyepiece. This will give you limited magnification (which in some cases is good for nice wide-field views of sky or landscapes), however, the image will be upside-down (in a spotting scope with prism built-in. A simple refractor telescope will have a correct view with camera directly attached)! A pain in the *** to deal with for me anyway.
2 is called Afocal photography and is a form of "digiscoping" where you attach the DSLR directly to the eyepiece already in the scope eyepiece holder. If you use an Amici style diagonal, the image will be right-side-up and left-right correct. But that is using a telescope, not a spotting scope that has a prism built inside of its waterproof body. I don't have to worry because I don't own a spotting scope, only a telescope, so the Amici diagonal works for me. Using with the eyepiece also give you most magnification (and most vibrations and unwanted movement!). I would think a spotting scope has an amici-style prism inside in order to get right-side-up/correct left-right views for the mostly terrestrial views demanded by hunters and birders, but don't quote me.
The Pentax eyepiece I have 20mm XW has a built-in male 43mm thread. The Pentax XF eyepieces do not have a thread on top. Most don't. I attach a simple chinese 42-43 step up ring to the eyepiece thread making it present a male 42mm thread to the camera's T-adapter (female 42mm thread). This is all assumed to be standard filter-sized pitch of 0.75 mm/thread. Some telescope manufacturers make life miserable and use odd-ball threads and pitches just so they can sell you their
wildy overpriced adapters. Zeiss uses 44mm. Takahashi uses 36.4mm (.75 pitch) as well as 43mm (1.0mm pitch), Celestron may use 54mm on some telescopes, Vixen uses 60mm, Borg uses 57mm, old Pentax threads are 42mm 1.0mm pitch, etc, etc, etc.
Nothing is standardized except that a T-adapter attached to the DSLR camera ALWAYS presents a 42mm female thread on the lens side.
Don't EVER cross-thread two items that have wrong pitch!!!! You will ruin BOTH items by ruining the threads. Most that say "52mm filter threads" have usual 0.75mm pitch used in photography, as an example.
Cloudynights is wonderful but you really need to be careful to ask newbie questions in the correct forum.
Good luck!