I have several lenses with ø 52mm filter thread therefore my choice was 52mm -> FX adapter, $8 from eBay.
Test shot, Fujinon 35mm in normal macro mode
Test shot with Fujinon 35mm reversed
What a difference. But I didn't like the extremely shallow DOF at f/1.4
Then I mounted Nikkor 28/2.8 AI-s
That's how Nikkor 28mm looks mounted in reverse
Stopped it down to f/16 and I got some really good results.
The 25¢ coin
And another one
Tiny field flower
Nikkor 28/2.8 works well but only at a very close range.
Next I tested Nikkor 50/2 AI-s, hand-hold for "outdoor" setup
I like "reverse lens" method, it is cheap and it works. Lenses with aperture ring is my preference. Ultra sharp Nikkor 28/2.8 (36x diopter) works well for "jewellery" type of shooting, static objects at a very close range, you need tripod and a good light. Nikkor 50/2 (20x diopter) gives more flexibility and seems a better choice for "bugs and flowers" photography.
Obviously focus ring doesn't work. You have to focus with your hands (tripod) moving camera back and forth. And, as I mentioned in my previous review , Fuji's focus peaking implementation (half pressed shutter release button cancels FP) makes it almost unusable for hand-hold macro photography. I got more misses than hits.
I am planning to experiment more once my DIY flash diffuser is ready:)