I found this product well made and a high precision item. The inner end takes a standard 1.25" filter. The chromed part also unscrews leaving a male thread of the same size. The end away from the telescope has a thread to take a T Ring adapter for an SLR camera. The inside will take 1.25" eyepieces or other similar size cylindrical item and has a locking thumb screw. I've found this useful for an adapted webcam as image sensor (minus its lens).
I am using this T-adapter with a Celestron EQ130 (MD) telescope but to use with a DSLR (without lens), a diverging lens such as a Barlow is needed to move the prime focus further outside the focus tube, to enable the image to focus on the DSLR image sensor.
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