Features: With AF-Confirm Chip. EXIF is fixed 50mm f1.4. Make M42 mount lenses can be used on Canon EOS EF camera body. Enable camera viewfinder focus confirmation light and sound. Supports AV (Aperture Priority) and Manual Mode. Exposure aperture data can be recorded in EXIF. Give you confirmation signal once you focus objective accurately. It is a aperture pin stop down flange version. It is possible to use Macro rings and other accessories. It can help you improve success shoot ratio. Allow to focus infinity in manually. Material: BrassPackage included: 1x AF Confirm M42 Lens to Canon EOS Adapter