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The following opinions have been automatically translated with Microsoft Translator. | 7artisans 25mm f/1.8 Pros: Sharpness at the center already at TA Cons: Focus loss on the focal plane on the lateral half of the frame Opinion: I was intrigued by the Chinese manufacturing targets that are on sale on the internet at less than 90 euros, I took the neewer 25 mm 1.8; Looking at it looks like the 7artisan 25 mm, is identical, even the cap. Obviously manual controls for aperture and focus, with focus peaking. Quite fluid ring nuts. Since there are no electrical contacts it does not transfer the EXIF data of the click. I did some testing on the outside, on Sony a6000. First of all, I note that the center is sharper than the kit 16-50 already at F2, at 2.8 improves slightly, 4 improves yet but in a completely negligible. It seems that it is sharp up to about half a distance between the center and the extreme edge, then it worded sharply, I saw the roof of the house that suddenly lost sharpness (which then remains that up almost to the extreme edge, where it is bad), not in a progressive way. In These parts it looks worse than the kit. Infinitely regulated, practically everything is in focus starting from the distance of 20 meters from me until the infinity (about, what I was framing was 7 km). Sharpness at the center even better than the kit, with the usual sharpness loss starting from half way. So if the purpose is to frame something in the middle of the frame, blurting the outer part, is certainly discreet; If you have to cross something that is at 2/3 of the distance from the center to the outer edge, we go wrong. In addition, it suffers by framing objects in backlight as chromatic aberration and flare. I have not noticed distortion, if not to a minimal extent. I did the tests looking at the images with the automatic adjustments in Capture One, with the kit the color rendition is better, probably takes advantage of the profile present, while with the other one uses a generic and the yield is a bit ' vintage. A wall of stones, from SX to DX of the frame and occupies the third central height, a little further down, distance 8 meters, 16-50 to f 4.5, neewer to F 1.8, F2, F 2.4, f 2.8. With the kit the image is evenly in focus, the other in focus the center, less around, to fire the floor at 2-3 meters from the wall. Then a wall of wood grilled with the ivy, distance 5 meters, same diaphragms: The center does not focus, moving away from the center in focus, and even a little ' floor. To f2.8! A few tens of inches of depth of field. At first it seemed to me that he had uneven behavior between different areas of the frame, then instead it seems that it is because the distance of the focus, initially starting from the center varies little, then half frame curve approaching suddenly to Me. With out of focus, I mean really blurry, and having as a comparison the two walls does not affect certain areas of the image, it seems a feature of the lens have this "curvature" that determines areas in focus and not, if I focus in the middle of the wall at the bottom is Blurry while it is in focus on the floor, if I focus the wall further down it becomes less in focus the center of the wall, while it is in focus a wall that is lateral and closer to me... If you imagine looking from above is like drawing an ellipse arc against the wall, starting from the center the Curve little line, then the curvature increases a lot and tends to approach the side... maybe it is the same effect of the optics for non-planar microscope, the most Economic, the image is curved on the sensor, if you focus in the center you have the outline blurred and vice versa. If you photographed 2 people, it is sure that one does not come into focus. It's not for me. It's a pity, because at the center where it is in focus is clearly sharper than the kit, even at F2. sent on January 15, 2019 |
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