It's not too difficult to focus in the center of the lens, but at the edge, I feel like I'm tuning a guitar with a loose neck. All I know is, it's super hard to figure out what "in focus" is with this lens wide open. My copy of this lens is not "sharp" by any means, and might even have decentering or other issues. Then I used Fuji's zoom-in feature at high magnification (not focus peaking, etc etc.) For the shot at the edge, I moved the focus point all the way to the left of the field of view but stayed in the center (halfway between bottom and top), and again moved the camera to aim the focus point at the Zeiss target. The lens is a Helios 44-M7 58mm 1:1.2 I bought off .įor focus assistance, I shrank the focus area to a point, then centered that point in the image, then moved the camera till the point was directly over the center of the Zeiss target.The camera is in manual mode: ISO 120 (Fujifilm's native ISO if I'm not mistaken), 1/40th second, and the lens is f/2, wide open.Lighting is a cheap LED worklight about 30º to the side of the chart, shining at it.The camera is on a tripod and I've squared and leveled the lens to the center of the test chart.The test chart is pinned/taped flat to the wall 2m from the lens mount (front of camera).So I opened B&H and bought an M42 Lens Turbo II, and a Minolta MD Booster Ultra plus an M42-MD adapter, and took some center and edge shots of a Zeiss test chart. My test is a little bit funny: I'm focal-reducing vintage lenses to my Fujifilm X-S10 camera. I read a lot about the quality of the optics of the Lens Turbo II and SpeedBooster Ultra, and decided to just buy both and test them.
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