松下 LEICA DG SUMMILUX 15 毫米 / F1.7 ASPH。 H-X015 -S（银色） - 国际版（无保修）
松下 LUMIX G Leica DG Summilux 15mm f/1.7 镜头电机使聚焦动作顺畅无声，适合照片和录像使用。 特别重要的是，当使用 F 值较小的快速镜头时，AF 的性能远高于相位差 AF 的性能。 当安装在 LUMIX G 的相机上时，您可以利用高速、高精度对比度 AF系统。
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I also own the Panasonic 20mm/1.7 and 25mm/1.4. Compared to the 20mm, the autofocus is much, much faster with seemingly less mechanical noise to it. At 1.7, they do seem to have similar ability with light. This is totally different than the 25mm which is much brighter, of course at F1.4, but the autofocus is similarly speedy. I found that the 20mm was really not quite in my sweet spot in terms of field of view -- it was usually not close enough or not far enough, whereas the 15mm and 25mm combined seem to fit the spread a little better. The 15mm is larger than the 20mm, but smaller than the 25mm, so it's a good in-betweener in so far as barrel length goes.
The photographic results are a tad better than what I've seen on the 20mm, but the real kicker for me was to have something that was a little wider than the 20mm, so I was happy that the image results are at least on-par, if not better. The "metallic" body is nice. I wanted the "black" version, but it was not in stock when I wanted to order it. I've since grown to like the contrast in color between the lens and camera.
The aperture control is physically on the barrel if you want manual control, but the aperture can be also controlled in menu as other lenses. I find that the manual control is a very nice touch. It rotates easily and is "notched" internally to represent those sizes not displayed on the barrel (from 1.7, 1.8, 2, 2.2, etc...). You can "feel" when the aperture ring hits another setting. There is also a switch on the barrel to go between auto focus and manual, which is a nice touch -- but a little small and not quite as easy to operate as I would have hoped. It sticks a little bit.
Overall, I think this lens was worth the price I paid. It was a prime purchase at the time so I was able to get speedy delivery. It was far less expensive here than pretty much everywhere else I looked as well -- which helps immensely as I don't think I could quite recommend this lens if it were in the 500 - > 600 dollar range. For that, I give it 5 stars. If it were that expensive, I would give it 4 stars and say that the 25mm would be a better purchase for that price.
I've included some shots with the lens on an Olympus OMD-EM10 set on iAuto (usually iso200, f1.7) so you can tell what image quality looks like in the hands of an amateur doing normal people things. Evening shots. A food shot. Travel shots with a person far away, medium distance and close up. The most fixing would be me hitting the 'enhance' wand button that standard with Apple OSX or iOS Photos app (too lazy to load up Photoshop nowadays).
I also have the Panasonic Leica 25mm/F1.4 lens as well. I absolutely love that lens as well. The 25mm will shoot better portraits and definitely can tell the difference shooting at night with no flash. The 15mm is a bit easier to shoot with traveling around outside, as you don't need to stand as far away at times. It is also a bit smaller and lighter. And the included hood and rubber lens cover really makes taking out and putting away the camera much quicker and convenient (I'm not a very careful person with things). I highly recommend both lens, and it's different enough to warrant getting both (I held off for awhile). But if you had to choose one; then again consider your use case.
For non-pros who are use to zooming. This isn't for shooting like that. Trust me, having a fixed prime lens will make you start shooting better and you won't miss the zoom as you have your feet.
I will say the quality of build is at least or better than what I expected at that price. It looks and feels nice. Huge difference over the kit lens.
Thankfully though, Panasonic makes a tough lens and the functionality and sharpness of the lens were unaffected. I've lugged this thing all over the country, took it onto planes, and let it bounce around in my bag while hiking. It can handle all of that and takes great wide-angle images!
My M. Zuiko Digital ED 12-40mm f2.8 Pro gets much more use.