I am currently shooting a Canon 100mm macro (200mm Effective focal length) with a Vello smart adapter and it works very well for most purposes. The combo is bigger and a bit heavy, about 28 oz., but I had the lens and can still use it on my existing Canon gear. I have posted a few images on here in the past, and rather like the images and the way it handles. Just sayin.... Tomorrow, I'll make a few images and them post here.