Pretty heavy piece of glass but really a gorgeous addition to my kit.

I now own 3 opteka lenses. I think they are a great value. So don't be lazy. Learn to use a manual lense and save a lot of cash.

I read so many negative reviews about this lens having manual focusing problems that I almost didn’t get it, but for me it’s been fine. Perhaps there’s been a firmware update since the original spate of reviews because it’s as smooth as every other Fuji lens at this point. Autofocus seems to be fine as well, though I don’t use it much. As for subject tracking, I wouldn’t know. Image quality-wise it’s as fantastic as everyone says. I could only afford one lens and I’m very happy I chose this one.

Quality is comparable to the 110mm f/2 which is in an incredible lens. Lightyears better than the cheaper 50mm f/3.5. Portrait images are stunning. Beautiful background wide open and tack sharpe. At times reminds me of the Pentax 67 105mm f/2.4 lens. The nose of the focus does not distract whatsoever to the overall end result.

This is a nice lens, easy to use and works great with my Sony A6000

Optically, this lens is basically flawless. Zero CA, beautiful bokeh, deeply saturated colors and incredible sharpness wide open. The build is solid metal and it is a reasonable weight and length. 

The AF motor is noisy and it doesn't silently snap to focus like a top tier FF lens. That said - the GFX is not a fast camera and not remotely ideal for sports photography. That's not really what the camera is designed to do best, so this lens being slower has no meaningful impact on workflow or handling. For landscape and portraiture the AF is more than adequate. It just sounds kind of like an old fashioned Nikon 85mm (though not as scratchy). At the end of the day, the focus is reliable and the hit rate is high.

More to the point - the FOV, bokeh, colors and rendering are beautiful. This is a perfect lens for the GFX system.

It’s a manual X Mount lens with endless possibilities. The clarity is unreal and it’s perfect for my daily shooting. It’s made VERY well, all metal casing. The price is low because it’s a manual lens no autofocus or anything, not because it’s low quality. I’m in love, plan on picking a few more lenses from Opteka for my Fugi.

I don't get the people complaining about the lens being slow and noisy. This is Medium Format, everything is bigger and slower. This is not the gear you buy for action shots, you buy it for the amazing picture quality unmatched by anything full format has to offer. And this lens delivers all that while having just the right focal length for street photography. For those that have been around like I have, you didn't buy a Pentax 67 for shooting action either. Horses for courses.

The Fujifilm GF 55/1.7 lens is one of the best lenses among the GF line. It is very sharp even wide open. With F1.7 aperture it is a great lens for portraiture even in dark environment. The size of the lens is a little bit bulky but OK on my GFX 50R body. The focusing is agile but a little bit noisy.

Stunning center sharpness wide open and complete lack of chromatic aberrations. The level of CA correction is on par with the legendary 110mm f/2 and vastly better than the 80mm f/1.7. It is liberating to be able to take pictures of shiny chrome objects in bright sunlight without worrying about bokeh fringing at all.

The edge sharpness drops off a little when wide open due to slight coma which can affect shooting stars and cityscapes at night, but honestly it is nothing to worry about and the problem is completely gone after stopping down by one stop. I do not hesitate at all to shoot this wide open.

According to Zemax simulations of this lens that I saw online, center MTF50 teaches 140 lp/mm wide open. Axial chromatic aberrations (focus shift with respect to wavelength from 436 to 656 nm) is within 18 microns which is less than a third as much as the GF 80, half as much as the Sony GM 50/1.2, and also better than the Sigma Art 40mm.

Autofocus is audible but it is reasonably fast and accurate on the GFX 100S.