Me gusta mucho los motores funcionan muy bien muy precisos gracias a los diseñadores de este lente

Me anime a comprar este objetivo para agregar un telefoto más largo a mi equipo sin gastar tanto, y vaya sorpresa, es un gran lente, si bien es relativamente obscuro por su apertura, en condiciones de buena luz es increíble, el foco tiene muy buena velocidad y no obstante es muy pequeño y ligero para un 350mm equivalente. El único contra que le veo quizá es que su construcción se siente frágil, pero no creo que nadie en su sano juicio compre las cosas para estarlas tirando contra la pared ja! Recomendado si tu presupuesto es limitado, habría que comparar con la versión de Olympus a ver que tal.

Great lens and excellent service

I have just gotten into micro 4/3. I was impressed by the reviews of newer micro 4/3 bodies. I am an old 35mm user and I previously had an E-volt 410 which I really liked. But I wanted something smaller and that would capture video. There are some great point and shoots. But I wanted faster focus, crisp and fast shooting, and to have access to a wide variety of lenses and creative control. I also wanted something that took good video.But I also wanted to go light and compact. So here is why in my opinion someone wanting a telephoto for their m43 should consider this over the 45-200. Light and compact. That had to be one of the reasons you went for m43. This weighs I believe 210 grams compared to 380. It is also remarkably compact. It takes astounding video. Probably you went m43 to also have good video capabilities.I watched many YouTube videos of the 45-175 in action compared to the 45-200. You can see a definite edge to the 45-175. It focuses faster when zooming in and out and is a much smoother zoom. The video quality is also professional quality. Well I can say outside I have gotten the best video I have ever shot from cameras and even stand alone camcorders. Panasonic calls these lenses 'HD' and they were designed with pictures AND video in mind. And it shows.Pictures are incredibly detailed and vibrant. I am using a DMC-G3 and outside there is a very fast focus. It locks quickly. I haven't noticed the problems of double images. This lens was shipped with firmware 1.1 so maybe that is why. I was concerned about that but ultimately even if it had been an issue I think the positives and the 95% of the time when it probably would not have been an issue were okay with me. There is good bokeh. I have uploaded a pic of leaves taken the day I got the lens on intelligent auto on the G3. I think pretty impressive.Is the lens perfect? No. Indoors it can hunt for focus and the video is good indoors but not superb like the outdoors. But I did not intend this to be my indoor lens. Don't get me wrong I have taken many good pictures and videos indoors trying out the abilities of the lens, it is just better suited to outdoors.Overall given how light and compact it is, the excellent picture results, and the even better outdoor video, I highly recommend this lens. I feel like I am getting a lens for the next 5 to 10 years of m43 use. I personally like taking video. Maybe because I have a 2.5 year old. So spending a little more for a nano-coated much more compact lens was worth it. Check out the YouTube videos. If video and picture quality is important as well as size and weight this is the definite zoom lens you should get for your m43.

I bought this lens fully aware of the reputation it has. For those of you unaware, this lens has a serious flaw in the Power OIS that renders it unuseable between 1/60 to 1/200 second. So why a four star rating and not a one? For me, I can live with it. I have had weak IS before (my EF 70-300 never seemed to be that effective) but when this thing works it works amazingly. I have never owned a telephoto that would allow me to beat the 1/focal length rule significantly- this lens will allow you to hand-hold down to 1/4th at the full 175mm! It is true what the other reviewers said- you shouldn't use the Power OIS beyond 1/30 of a second, but above 1/200 it works perfectly fine for me. The current GF3's firmware even actively avoids these problem shutterspeeds so long as you are in auto ISO.That said, from an optics standpoint this lens works great. I feel it is easily a match for my EF 70-300, but at a bare fraction of the weight. Like most zooms, it does help to stop down, but with the smaller image circle on the Micro Four Thirds this stopdown is generally a full stop wider than with an APS-C system. For this lens, I have found that for lengths up to 150mm it sharpens up at f5.6 and doesn't improve much beyond that. At 175mm, the lens is noticeably softer (but certainly still useable) and can be further sharpened at f8.The build quality is good- not "L" grade but decent. A very nice feature is that there are no moving external parts, so there is no risk of developing play in any of the lens tube elements as often happens with extending lenses (again, my 70-300 is terrible in this regard). This also allows you to attach fairly heavy filters or closeup adapters to the front without fear of damaging anything. It is very lightweight and small- so small in fact that I can always have it in my Domke satchel bag (as opposed to the Canon telephoto which is too big and heavy to carry without a large camera bag or lens case). Having the 46mm filters is a real plus as well (saves a ton of money and space for filters).Where this lens really shines is in the fast and reliable autofocusing. On my GF3, I have gotten many more keepers out of this lens than out of the EF 70-300 simply due to the contrast-detect autofocusing and ability to use high-magnification on the viewfinder/screen. While this is true for all Micro-Four Thirds lenses, this is especially valuable on long lenses like this where even slight calibration issues will lead to disappointment.So in summary, if you are looking for a light-weight walkaround telephoto for hiking and can live with having to plan your shots, this lens is a great choice. There are other obvious options out there (Olympus and Panasonic both make several lenses in this range) but to date this seems to be their best option if size and inherent ruggedness are your considerations. That- plus the fact that it tends to be heavily discounted due to the IS flaws- makes this a steal if you can get it under $300.

The Panasonic PZ 45-175mm f4-5.6 MFT lens (pleasantly!) surprised me. I had returned a Panasonic 45-200mm lens (that was relatively inexpensive and sharper than expected), which had, for me, an unacceptably high level of chromatic aberration problems. I hesitated buying this PZ ("power zoom") lens due to comments about a frequent problem with "double-imaging" at some shutter speeds with the lens used near 175mm, reportedly mediocre performance near infinity-focus, and the relatively higher price. When it appeared that new stock of the lens had arrived at Amazon (and with that, perhaps some "fixes" had been made), I decided to give it a try. I was attracted by its compact size (which doesn't change with either focusing or zooming), by its reportedly low level of CA, and by its having a power zoom lever (possibly useful while shooting video).What I found with the sample I received was that the image was sharp to the image corners even "wide" open at infinity-focus (and also at close-focus) throughout its zoom range, its distortion level was low, its CA level was also low, its illumination was quite even, and its resistance to flare and ghosting was high. I then checked it with many photos shot at 175mm in the potentially "offending" shutter speed range of 1/60th to 1/200th second. Only one of the photos was not sharp (but it did not show double imaging with in-focus high-contrast edges...). (BTW, this lens that I recently bought from Amazon had the firmware update version 1.1 already installed.) Next, for "fun", I tried some low-light photos at 175mm and f5.6 with the camera used hand-held for 1/10 and 1/15th second exposures at ISO 1600 with the G5. MUCH to my surprise, some of the photos were quite sharp, even when viewed at 100% - and they even looked good otherwise! (I'm still getting over this surprise!) This turned out to be a VERY good lens!I tried adding a Nikon 3T achromatic close-up lens to the front of the zoom (I needed a 46mm-to-52mm step-up adapter ring to do this), and found that this turned the 45-175mm zoom into a useful and sharp macro zoom lens! (BTW, this Nikon 3T achromat also works well on the Panasonic 14-45mm zoom lens without an adapter.) I then tried stacking the 3T and a 5T, which both have the same power) to double the power (I adapted the 5T to the front of the 3T with a 52mm-to-62mm step-up adapter ring). This also worked very well, and it resulted in very high magnification with the zoom set at 175mm.I then tried shooting video with this lens. The G5 is unusual for a camera of its type in having an on-body zoom lever for use with the couple of Panasonic "PZ" lenses available, of which this is one. These PZ lenses have zoom levers, but I found it easier to control zoom smoothness (while keeping the camera steady) if I used the zoom lever on the camera rather than using the one on the lens. The G5 also has (in its menus) additional zooming speed-rate selections making it possible to have the very slow zoom rate that I prefer to use while shooting video. But, this lens is not parfocal (it changes focus with zooming), and there have been a couple of problems resulting from this and with the lens aperture changing with zooming. I will see if I can find ways around these problems, and if successful, I will report my findings here.An additional note: a rattle can be heard as the lens is tilted. This is normal when the power is off (it is not indicative of a fault).I am VERY happy with using this lens for still photography, and I'm hoping to find ways of using it while zooming during the shooting of video.Recommended!UPDATE:I found that by using "Continuous-Focus" set to "On" in the video menus, and with the auto 23-segment AF focus pattern selected, I can get much smoother exposures with zooming while shooting video while using the on-body (G5 and G6) zoom toggle.--DR

I've been using this lens for the last couple of months with Olympus E-PM1 to great success. Very sharp wide open at all focal lengths even for distant objects. I have not experienced any OIS issues others have been reporting. OIS is disabled on Olympus bodies so I wouldn't know anyway. The lens is light and compact (46mm filter thread), the zooming is internal so the lens does not extend. Power zoom feature (optional) is very useful for video and also for stills. I find it very precise and superior to manual zooming. I use power zoom exclusively with this lens. The pace of zooming is control by how hard you tilt the toggle conveniently located on the left. Image quality is superb. Great color, contrast and sharpness across all focal lengths wide open, no need to stop down (it doesn't get visibly better anyway). My experience is in agreement with many reviews which said that the lens is optimized for wide open shooting. This is important because it is not a bright lens and one would have to watch the shutter speed so using apertures as large as possible is recommended.Compared to Olympus 40-150mm (I used to own one), Panasonic 45-175mm is better in every way:- Better optics. The lens is sharper especially for shooting at a distance (you would need to stop down Oly 40-150 to f8 to get acceptable corner to corner sharpness, plus Oly is not that sharp at full zoom)- Has noticeably better contrast and color- Slightly faster AF especially at full zoom but more so in lower light (tested on same body). The AF is significantly faster during video (C-AF) vs Oly 40-150mm (same E-PM1 body)- Internal zoom (IMO, all zooms should be like this, we're in 2012)- Power zooming (invaluable for video). Yet regular manual zoom is still there- Useful additional zoom range (175mm vs 150mm)- The lens is supposedly a little longer than Oly 40-150mm but it feels smaller due to much smaller filter thread (46mm vs 58mm) and feels much smaller in actual use due to internal zooming (Oly feels gigantic when extends and easily overwhelms small m43 cameras)- MUCH better build quality, rubberized zoom/MF ring, solid metal mount, made in Japan- Comes with a very nice and compact reversible hood, pinch lens cap (perfect for use with the hood) and a lens pouch