JMI · 2" Focuser → 1.25" Eyepiece + T-Thread
A combination adapter for a 2" focuser — run a 1.25" eyepiece for visual, or thread on a camera for imaging.
The JMI Combination Adapter (ADPT2-1.25T) inserts into a 2" focuser drawtube and does the work of two adapters in one. On the visual side it holds a 1.25" eyepiece on a non-marring compression ring for precise, scratch-free centering. On the imaging side it carries a standard T-thread (T2 / M42×0.75), so you can bolt a DSLR (with a T-ring) or a CCD/CMOS camera straight to the focuser — a far more secure, repeatable hold than dropping a camera nosepiece into a 1.25" adapter. The focuser end also carries standard 2"/48mm filter threads. JMI is part of the CXB Astro family.
Specifications
Telescope side
2" barrel — inserts into a 2" focuser drawtube; 2"/48mm filter threads
Visual side
1.25" eyepiece holder with non-marring compression ring
Imaging side
T-thread (T2 / M42×0.75) for a DSLR T-ring or CCD/CMOS camera
Locking
Compression ring secures inserted equipment
How it connects
2" focuser → ADPT2-1.25T combination adapter → visual: 1.25" eyepiece or imaging: T-ring + camera
Why T-thread for a camera: a threaded connection holds a camera square and rock-steady on the focuser — it can’t slip, rotate, or sag the way a camera nosepiece clamped in a 1.25" holder can. That stability matters for keeping a sensor parallel to the focal plane and for repeatable framing.
Frequently Asked Questions
What does the JMI combination adapter do?
It inserts into a 2" focuser and gives you two ways to connect: a 1.25" eyepiece holder for visual observing, and a T-thread (T2 / M42×0.75) for attaching a camera. One adapter covers both visual and imaging use.
How do I attach a camera to it?
Thread your camera to the adapter’s T-thread. For a DSLR or mirrorless body you add the T-ring made for your camera mount; a CCD/CMOS astronomy camera with a T-thread connects directly. The threaded connection holds the camera securely and square to the focuser.
Why use the T-thread instead of just a 1.25" adapter for my camera?
A T-thread bolts the camera on solidly, so it can’t slip or rotate and the sensor stays square to the optical path. A camera held only by a 1.25" nosepiece and thumbscrew is easier to knock out of alignment and can sag under the weight of a heavier body.
Does it have filter threads?
Yes — the focuser end carries standard 2"/48mm filter threads, so you can thread a 2" filter inline below a 1.25" eyepiece or your camera.
Is the eyepiece or camera included?
No — the adapter is sold on its own. You supply your own 1.25" eyepiece, and for imaging your own camera plus the T-ring that matches its lens mount.
Building out your imaging or eyepiece kit?
Browse the full range of visual and imaging adapters to match every barrel and thread in your setup.
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