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Designed for attaching a Sony DSLR camera with the older style A-Mount to any of the Sky-Watcher 0.85x Focal Reducer/Correctors.
NOTE: Not compatible with Sony Mirrorless and other E-Mount cameras.
M48 rings are used for larger format imaging. These are different than the standard T-Thread. M48 rings are to be used on the Esprit and ProED series when using the dedicated field correctors.