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This ring is screwed on one side directly on the rear thread of your telescope kind Schmidt Cassegrain and offers a standard M48 threaded output to fit your photographic accessories. This ring of large aperture is useful for photographic solutions in 2 "with cameras or camera with a large sensor (> = APS-C).
It avoids vignetting induced T2 standard and is standard with all the rings and filters with thread M48 (2 filters and accessories "50.80mm).
List of compatible instruments (not exhaustive)
Threads / technical information:
The very small length of this ring makes it particularly interesting for astronomers wishing to "stack" of accessories before their camera at home (filter wheel, proofreaders, adapter rings, etc ...)
The M48 thread has a diameter of 48mm thread, standard in astronomy for accessories 2 "filter type and screw-adapters. This thread is also present on the bushings of the return-bent ocular and 2" (50.80mm)
This accessory is of good quality, fully machined aluminum, glossy finish, and anodized black to avoid maximum internal parasitic reflections.