Why buy a GFX in the first place, if your are going to use an optical degrading tool such as this? Makes no sense to me.
in general i agree....and to get the best IQ out of the camera the native fuji lenses are an easy choice, especially since in the big picture they are reasonably priced and excellent quality....
but i also personally found that sometimes it is fun to paint with a different brush...one that might not draw the perfect line and the imperfections add to the overall look....being able to use pretty much any piece of glass (on for example the sonys) has opened doors that just weren't there before....i have a couple of old, beat up lenses that produce effects that are hard to duplicate and it is great to create this stuff in camera anyway....
i think fuji was very smart to open the GFX to all lenses....there is no drawback but a lot of upsides to this....
what i don't understand is trying to use very good modern DSLR glass via an adapter (such like this one) on a camera like the GFX....there won't be an effect, just degraded performance without AF.....i am not really sure why i would use a (let's say) sigma 50 on the GFX via this adapter instead of on my (for example) nikon 810....the 810/50 combo would probably give me better results with much easier handling....
i think the sony GM lenses are some of the best glass i have ever used but even if i could use them on the GFX, it just does not make sense to me at all....fuji glass is better, works better on the GFX (just like the GM does on the sonys)....
but it is awesome that i can use old russian, leica, nikon, canon,....lenses on both....
but also really does not bother me if there is vignetting on the GFX with some or all of them....that said i did send them an email since i do own the GFX and would still like to try this adapter to see what it can and can't do....
always better to have more options....