Leitz Visoflex  type_Projectors The Tamron SP AF 300F-CA

The Tamron SP AF 300F-CA 2x is a 2x teleconverter for Canon EF mount lenses

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you will permanently damage your eyesight

I think they mean digital mirrorless cameras

Check your camera's manual to be sure

Leitz Visoflex &nbsptype_Projectors The Tamron SP AF 300F-CAThe Leitz Visoflex is a reflex attachment for Leica thread mount cameras and lenses. With ordinary LTM lenses, you can use this accessory for macrophotography; with Visoflex lenses, you can shoot telephoto lenses too long to be practical with a normal rangefinder. Now, is a Visoflex actually something that can be described as "practical"? No. Maybe. It depends. But if it sounds like you might want to find out for yourself, this Visoflex is in