Nikon 55mm f3.5 AI Micro-Nikkor Wideangle The RF mode is a

The RF mode is a magnified image of the rangefinder only- basically an optical version of the Live View zoom mode on newer mirrorless cameras that makes accurate focusing easy

A Speed Booster slightly reduces the crop of your lenses (from 2x to about 1

And as you might expect

but it works well

Also has a very cool spring-loaded lens cover for dramatic photo moments

Nikon 55mm f3.5 AI Micro-Nikkor Wideangle The RF mode is aThis Nikon 55mm f3. 5 Micro Nikkor is in pretty rough cosmetic shape, with paint and finish wear on the barrel, plus a couple of scrapes here and there. Not gonna lie, it looks like it's seen things. But here's the good news: Focusing and diaphragm are good, the glass free of haze, fungus or scratches, and image quality is excellent.