Although I have no experience with this specific brand, it looks very much like some Chinese-made bellows I bought a couple years ago on Ebay. You didn't state a specific question, so I'm not sure how to reply other than to say it's an inexpensive way to get into shooting with a bellows and for me, it was all I needed. You should be aware that you will want a lens with an aperture ring. I use an older 55mm macro with mine. There's no electronic communication through the bellows. Because you're working with such shallow DOF, you'll likely find you need a focusing rail as well - it's very difficult to achieve perfect focus by moving the whole tripod. When I bought my bellows, I got it in combination with a rail. Both for around $100. This is not something I use much at all, so that was the right price range for me. You can, of course, spend many hundreds more on a Really Right Stuff rail if you're so inclined.
Thanks, sorry for being cryptic. I have a Kirk rail, works well with my old 105mm d lens. I have a 50 1.8 d lens a well. While the best bellows is probably the Pb-4 the cost is 10x as much.
Right now I am using Kenko tubes that give me 68mm approx of extension.
I also understand that the magnification would be best with a shorter, e.g. 20mm) lens. So there is lots to think about the more I investigate.
Does the Chinese made version have a name brand? Does it have the ability to move at both ends or just one? Do you have its length. The fotodiox only moves at one end and seems to be about 40-50mm shorter than the Pb-4.
Do a search on Ebay for "bellows nikon mount" and you'll see half a dozen of them that all look alike. Mine doesn't seem to have a name anywhere on it. From the way they look, I'd say they're identical to the FotoDiox bellows. I've ordered several things from China and never had any problems. Takes about 10 days.
Only the front of the bellows moves. By my fairly rough measurements, when the bellows are closed, the distance from the back side of the rear camera mount to the front side of the front lens mount is about 35mm. When open as far as it will go, the distance is about 143mm. There is a scale on one rail. It starts at 18mm (when the bellows are closed) and reads 125mm when the bellows are fully open.
I can't say one way or the other about using a shorter lens. Like I say, I used a 55mm macro and that worked for me.
Remember that you get what you pay for in quality. If this is something you plan to use a lot for professional purposes, maybe the cheap option isn't the way to go. But if it's just for fun, then I think it's entirely adequate to play around with.