Fotodiox DLX Stretch Lens Adapter - Compatible with Leica R (LR) Mount Lens to Canon RF Mount Mirrorless Cameras with Macro Focusing Helicoid and Magnetic Drop-In Filters Lens Mount_Nikon S-Mount This is far more desired

This is far more desired than the close-up lenses which are added to the front of the lens via filter thread

Composition screen has dovetail tracks for various focusing accessories

Top Notch Craftsmanship

the bulbous front lens element and lack of threads make it impossible to add filters - until WonderPana

Fotodiox DLX Stretch Lens Adapter - Compatible with Leica R (LR) Mount Lens to Canon RF Mount Mirrorless Cameras with Macro Focusing Helicoid and Magnetic Drop-In Filters Lens Mount_Nikon S-Mount This is far more desiredDescription Specs Compatibility Notes Product Highlights: Mounts vintage Lenses to Canon RF Mount Mirrorless Cameras; infinity focus or beyond allowed Built in focusing helicoid provides macro focus for any lens as well as correction for back focus Precise fit and solid connection; lens has no play, gap or wiggling when mounted on adapter Precision all metal construction with chrome plated brass mounts for secure and solid fit Limited 2 Year