This adapts the M42 X .75 T thread to the over-sized M48 X .75 T thread. It adds about .9 mm to the M42 male thread length and measures 3.85mm in total length.
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I had one of these come with my CCD camera. I needed another. It allows me T-adapter (nose piece) to screw into my scope and other configurations with extension tubes. This worked perfectly but wasn't easy to find. Luckily, Stellarvue came to the rescue.