Speed Booster for Contax/Yashica C/Y E lens to use for Sony E mount camera

Viltrox Contax/Yashica C/Y-E Speed Booster

This lens mount adapter allows you to use theContax/Yashica E Lens on the Sony E Mount camera body, it's saving you the expense of a costly and irreversible conversion.

Feature:

Industry's best aperture ring covers a 8-stop range markings, clearly indicating actual number of f-stops.
Compatible with both Contax and Yashica lens.
All metal structure, with excellent opticals (4 elements/4 groups)
Increase maximum aperture by 2 stop.
Increase MTF.
In common lens adapters, cropping effect occurs in all APS-C digital cameras with 1.5x magnification.
This adapter reduces focal length to 0.71x , to adjust the image size to near 1:1 so that the focal length of the image is close to actual focal length of the lens, e.g. 50mm x 1.5 x 0.71 = 53.25mm.