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| sent on 23 Maggio 2024
Pros: sharp in the center practically always, robust construction, no distortion, flare resistance, in the Pentax version it transmits exif data
Cons: lens hood without locking, expensive filters (100 mm plate), full-aperture vignette, not exactly popular price, not tropicalized
Opinion: I bought it last winter with black-friday because I wanted a lens for panoramas, astrophotography or special shots, and I must say I made a good choice. The optics are immediately good. It is of robust construction and you can already see it from the weight that is not exactly "feather", even if the dimensions are all in all small taking into account its angle of view. The Pentax 15-30mm f/2.8 for example is huge in comparison and weighs almost twice as much. It is equipped with its lens hood, which works well but does not have a click that locks it in place once mounted, and although it is well frictioned it can happen to move it accidentally, consequently having the corners of the frame dark is a moment. On the other hand, the front metal cap is of excellent workmanship and remains firmly in place. The optical qualities pleasantly surprised me. The sharpness is very good in the center at practically every aperture, while at the edges at full aperture it is less so, but I think it is quite normal with such an angle of view (I use it on full-frame). Diaphragm the situation improves a lot and the edges are well defined already at f/5.6. Beyond f/11 you begin to notice a slight drop in sharpness, but already at this aperture you have a huge depth of field and it is useless to close it any further. At f/2.8 there is also an evident vignetting, which disappears already at f/4 and in any case can be corrected in PP without difficulty. The lens lives up to its "Zero-D" designation, as distortion is imperceptible. The resistance to flare is also very good, there is only some reflection at full aperture with the light source inside the frame, but just close one stop and everything is solved. My version for Pentax seamlessly transmits exif data to the camera when the aperture ring is on the "A" position. In this regard, I point out that the "A" position is exactly like all the others, that is, it does not have a lock/unlock button to use the ring in manual. I don't consider it a defect, more than anything else it is a detail to keep in mind. The aperture clicks are well defined but in manual you can only select the integer values, the intermediate ones (F/3.5, f/6.3 etc.) are only available through the camera menu. The focus ring is also very pleasant to use, well frictioned but not hard, of which I appreciated the very particular calibration, that is, almost all the rotation to focus with great precision from the minimum distance (18 cm) to about three meters and the rest to get to infinity. The price is quite high and in my opinion a bit exaggerated, and maybe given the cost it could have been tropicalized, but so far this lens has given me great satisfaction and is making me tempted to sell the Pentax 15-30mm, which I will probably keep only because being a zoom it is more versatile, and a round of applause to Venus Laowa who is one of the very rare manufacturers that supplies some of its lenses (not all, alas) with Pentax mount. |
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