Number 3!!! This was the lens I wanted to start with. My Nikkor W 180mm f5.6 Large format lens. This thing is used to cast an image for a 4x5 or 5x7 large format film camera!! It's 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 W 210 and the Nikkor W 100mm has shown very nice promise. The biggest advantage is the coverage. This 180mm along with the 100mm and the 210mm has the best edge-to-edge and corner-to-corner sharpness on a full-frame camera. No softness anywhere. Also, 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 have been using this for long exposures and landscape photography. One other issue with this lens and the 210mm is the very bad lens flare or hotspot. YOU MUST USE A LENS HOOD!!!! The center of the image gets blown out for some reason. I made a slip-on lens hood for 100mm square filter holders. This works with both 180 and 210. It will be in the download file.

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 1 to m65

M3 Thread Heat Set Inserts

m3 x 8mm Flat Head Socket Cap Screws Countersunk Bolts

Last but not least a Nikkor W 180mm f5.6

None about a lens hood.

As I said above you need one. Included with this download is a hood for a filter holder. you do not need to use mine something like a Mamiya G3 or G2 lens hood will work great for this. The cheap metal ones are not deep enough. The lens filter is 67mm and the hoods on Amazon and eBay are only about 40-50mm long. The included one I made is 100mm long. If you don't have a deep enough lens hood the center of the image will be blown out. One last thing I should point out. If you go with a Mamiya G3 or G2 the filter ring is 77mm. Make sure to get a step-up ring for 67mm.