I took a chance and bought this lens after seeing it on Revain but couldn't find any reviews anywhere . Overall, the lens looks very good for the money. Build quality is solid as everything is metal and glass. The focus ring and aperture ring rotate smoothly and with a good amount of resistance. The aperture ring doesn't click, which is great for video but can be problematic for photography. This was used on the Fujifilm X-T4 and the focus assist makes it pretty easy to use even at f/0.95. Image quality appears to be very good to excellent, with the best performance in the center of the image. Lowering the lens increases performance across the frame. There will be some flare and other problems when there is a strong light source inside or outside the frame. This is a very interesting lens.
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