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This sturdy aluminum T-Adapter is the accessory
of choice if you’d like to attach an SLR or DSLR camera to the smaller
rear cell threads of a Celestron NexStar 4SE telescope or C90 spotting
scope for prime focus photography.
To get started, you’ll need the appropriate T-Ring for
your camera body (#93402 for Nikon & #93419 for Canon EOS). Remove
the lens from your camera and attach the T-ring in its place. Since
the T-ring is camera-brand specific, it will snap right on just like a
lens. Next, remove any accessories from the rear cell of your
telescope. Screw the Celestron NexStar 4SE T-Adapter onto the rear cell
threads until secure. Now, thread the T-ring & camera onto the
T-Adapter. That’s all there is to it. The camera is now using your
telescope as a telephoto lens.
Prime focus photography is popular for short exposure images of terrestrial objects as well as celestial objects like the Moon.
Your camera will need to be in fully manual exposure mode, although some brands of camera may
also work in aperture-priority autoexposure mode. Additionally, if
there is a switch on the camera which chooses the focus mode, that
switch must indicate manual focusing.