Here is number two. I wasn't going to make a 100mm adapter. I was hoping to make a 65mm a 90mm and then a 180mm to round it off. But here we are. It's also funny to see a Nikon Lens on a Canon body.

Let's talk about why, now that I have tested this out. So far the Fujinon 210 has shown very nice promise. The biggest advantage is the coverage. This 100mm and the 210mm has edge-to-edge and corner-to-corner sharpness on a full-frame camera. I don't see any Barrel distortion. You are using the very center of this Large format lens. Some would say the best part of any lens. The biggest downside is the Lack of image stabilization. On a Canon RF mount or Sony or other newer cameras you get that in the body. The camera I'm using is from 2008 and doesn't have that.

I own a few Large format lenses from 90mm up to 1070mm. Most of the lenses I own would just look ridiculous on a 35mm/full frame. I figured it was cheaper to build an adapter for some of the focal lengths that I can’t afford on a full frame. Mainly 180,210, and maybe 360.

Print Settings:

100% infill This isn't optional. The walls are just thick enough to keep light out. Print with a Black Filament. Layer height should be 0.2 - 0.1 or better. Smaller layer heights make better flange mounts. You want support to keep the flange fitting without modification. If you want to print with a lighter color then use some "Musou black" or "Black 2.0" or something similar on the inside. A few coats should be enough. It's not a bad idea to paint the inside even when printing with a black filament. The lenses used cast a very large image circle compared with a lens meant for a full-frame camera.
Parts needed:

M65 flange

M65 to M65 Mount Lens Adjustable Focusing Helicoid

Copal 0 to m65

M3 Thread Heat Set Inserts

m3 x 6mm Flat Head Socket Cap Screws Countersunk Bolts

Last but not least a Nikkor W 100mm f5.6