[1.5 lb] Perfect tight fit on both ends. Set f/stop with ring on lens.

[Yes] Most excellent tube… fits my camera on one side and an older macro Mamiya lens on the other. At first the shutter didn’t work but watched a YouTube video and learned that in settings the camera needed to be set to no lens. Who knew?

[Yes] I own two Kipon adapters for mounting Pentax 645 lenses on the GFX system. One is a shift adapter to use the excellent 2nd generation Pentax 35mm (645) as a shift lens and this adapter to use the Pentax 120 Macro - which is a stellar lens. Kipon makes solid adapters that are well machined, constructed and designed for professional use.

[Yes] I am new to medium format but this makes it a little more easy to use vintage glass.

[FUJIFILM G] Kipon makes the best adapters for Fuji GFX system. When adapted to the Fuji GFX 100S ; it fits snug and does not wiggle. Other adapters fit looser i.e. they shift back and forth by 1 to 2 mm when mounted. In my opinion this could create damage to the mount. In conclusion pay the extra money especially when you're placing these adapters on a $6000 camerak

[Yes] Works perfect

[FUJIFILM G] Strong materials used for tight fitting mounts as one should expect for the price.

[1.5 lb] I already had the Fringer adapter for Nikon to Fuji X and wanted to try this on my GFX50Sii with my existing lenses. The focus is quite slow but accurate, there are times that the focus misses and you get the red error, but it is still better than manual focusing plus you get lens data.

I tested this with a few Sigma Art lenses, the Sigma 60-600mm, and some Nikon lenses. All worked similarly, some had vignetting and some did not.

This is a worthwhile investment if you already have the lenses and want to use them on your GFX. I would think that on the GFX 100s that focussing will be way better.

[Yes] This adaptor is good. Everything is in manual mode, but that is really the point. I like it, for the price point you probably are getting a good product. It is not light and delicate able to hold up to the weight of the lenses.

[Yes] Although pricey, it is indispensable if using the superb 45-85 mm Pentax 645 zoom lens for close focus and macro at the full zoom range of this lens. Very well made, sturdy, and super smooth helicoid. Other helicoids I bought do not have a throw long enough for the longer end of the zoom range of this lens. If you need a helicoid for your Pentax 645 lenses on your Fujifilm GFX, this is the one to get.