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The Pentax PF-CA35 allows photography using Pentax K-mount 35mm & digital SLR cameras with the fabulous line of 65mm, 80mm & 100mm spotting scopes. It is not used in conjunction with an eyepiece, but rather you remove the eyepiece and attach this device where the eyepiece would normally attach to the spotting scope. You then attach your K-mount camera to the side of this device which is not screwed into the spotting scope & you're ready to shoot.
All ventures in the world of telescope photography require the use of a sturdy tripod, first and foremost. Logical choices for a tripod/head combination are indicated here as accessories, with an ascending order in price & support. You must take great care to keep vibrations during exposure to an absolute minimum. Employing a cable release, electronic release or remote control for tripping the shutter is absolutely necessary. And while it is not necessary per se, a mounting bracket will do wonders to reduce vibrations of your rig.
Note: Your camera will need to be in fully manual exposure mode, although some Pentax cameras may also work in aperture-priority autoexposure mode. Additionally, the switch on the camera which chooses the focus mode must indicate manual focusing.
Five fully multicoated lens elements in four groups
Works ONLY with Pentax K-mount type cameras
18x with 65mm scopes 23x with 80mm scopes 29x with 100mm scopes
f/12.5 with 80mm and 100mm scopes f/12.0 with 65mm scopes
Angle of View
3.1° with 65mm scopes 2.3° with 80mm scopes 1.8° with 100mm scopes
The specified viewing angles reflect 35mm SLR cameras & changes on Pentax DSLRs with APS-C size sensors. True viewing field is identical, but APS-C sensors don't see some of it.
Minimum Focus Distance
19.0' (5.8 m) with 65mm scopes 21.0' (6.4 m) with 80mm scopes 30.2' (9.2 m) with 100mm scopes