This adapter will be useful for those who wish to replace the stock Vixen refractors with 90mm tube (which covers quite a few current and vintage models like SD81S, ED81S, ED80S, FL80S, A80SS, A80M) with the Borg series of helical focusers, as well as Kasai and Feather Touch Crayford models with M57 threads.

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Adapter Front Side	M57x0.75
Adapter Rear Side	M88x1
Adapter Added Length	21mm
Material	Aluminium
Manufacturer	RafCamera
Advantages	Design: Many of our products were inspired by customers, and have great application value. Material: Aluminium alloy 2024 (used in aviation and space industry). It is light and durable. Technology: Cutting from solid bars provides the highest possible product quality. Tolerances: A bit tight fit is better than too loose fit for imaging equipment.

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