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The Letus M42 Screw Mount Adapter allows users to attach their favorite M42 mount lenses to a Letus35 adapter. The screw mount thread has been used in the past by Pentax, Zenit, Praktica, Zeiss and Voigtlander. An extensive collection of M42 mounts can be found while being extremely affordable, and can provide a cost effective way of gaining additional optical flexibility.