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Home Astro-Imaging T Thread & M48 Extensions T-Thread Adjustable Metal Spacer Locking Rings
M42 Locking rings provide a variable adjustment for precise positioning of suitable M42 (T-Thread) threaded attachments, over a thread range of 8mm. This Locking Ring has an internal female M42 thread of 5mm depth and an external male M42 thread of 10mm depth. This exterior thread features a 1.5mm depth / 5mm width locking collar, which is used to vary spacing between attached M42 threaded accessories and to provide a substantial lock when in position.Ideal for critical adjustable spacing of T rings and T threaded accessories with astro - imaging, precision metal construction with threaded adjustability.
First class addition to my accessories collection This is a really useful spacer to have when setting the back-space between focal reducer and ccd focal plane. This being due to the fine adjustments that you can then lock into place. (22/09/2017) Dave - Hampshire, England
Well made variable spacer I'm converting my Celestron RACI finderscope into a guidescope, but with the adapter I needed extra 22mm. With a couple of other spacers, this variable spacer allowed me to orient the guide camera with the main scope and lock it within the adjustment range of the focuser. Perfect. (17/06/2017) Mike Curran - Devon
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