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Cons: Slow AF, whole optical block moves back and forth, FBW manual focus.

Pros: Exceptional optics and when paired with EC20 it pairs really well with Raynox DCR250

Summary: Helluva lens, sad Olympus didnt make a comeback with these bright macros.

Cons: A bit plasticy for my taste, but that buys light weight. Slow auto-focus, and lack of auto-focus \"ranges\" to speed things up. SO SHARP, you DO NOT want to take portraits of older people with it, unless you smear some Vasoline™ on a filter, first. :-)

Pros: Tack sharp. Razor sharp. Ouch sharp. High contrast. Not a portrait lens, unless you want to spend hours in post-processing, getting rid of every zit and wrinkle. Mates nicely with the RF-11 ring flash, for shadow-free macros. Very flat-field for shooting postage stamps, etc. Lightweight and small, albeit by using a lot of plastic.

Summary: Want a sharp, sharp, SHARP lens? This is it!

Cons: None that matter a great deal. Focus accuracy averages below 100%, which means you normally need to stop down the aperture, but with a macro lens that\'s normally what you would do anyway.

Pros: Outstanding sharpness and colour rendition at all apertures. No aberrations of any kind.

Summary: This superb lens ought to have secured the long-term future of the Four Thirds system virtually on its own, but it was a relatively expensive option and in truth it was far better than any of the camera bodies it was attached to. To be honest, that probably still remains the case.

Cons: very slow autofocus even on nativ 4/3 mount

Pros: sharp, sharp, sharp

Summary: sharp, sharp, sharp

Cons: Focus a bit slow (a lot of macro lens have slow focus due to the long range)

Pros: Outstanding image quality, even at f2. Not heavy. Weatherproof.

Summary: I have a lot of images at www.manuelchagas/photos/manuelchagas Give a look. Better than words.

Cons: Terrific sharp sharp sharp images; good autofocus speed ( all macro lens are a litlle bit slow, because of the long movement); 300g only; wonderful colours; weatherproof ...

Pros: None so far

Summary: Give a look at www.flickr.com/photos/manuelchagas

Cons: IT WILL SPOIL YOU! :-) This is the only real problem with this lens. It provides such levels of quality, that it makes you search it from other lens, which you can't get. It is a bit sad, actually. Other thing is that is has no focus limiter lever, and is a bit noisy. External focus (internal focus, SWD, and focus limiter would be a god-given feature for this marvel).

Pros: Optically perfect and extremely light for 100mm equivalent. Weather resistant. Shade included.

Summary: Fantastic lens. You can (and should) use it wide open as much as you want/like. I don't precisely know what T-stop this lens is, but my F1.4 Zeiss is only 0.7 stops faster than ZD50; it is extremely bright. I don't know what this lens aren't good for, except when it is dark, so it starts hunting. This lens is must-have, as there is no comparable lens on the market today, from any producer. You can get a canon 105 macro of comparable sharpness, but its size doesn't come close to ZD50.

Cons: Slow focus and no focus limiter

Pros: Outstanding optical quality well built weather seals (usable under moderate rain at least)

Summary: Mandatory lens for any 43 or m43 user

Cons: Autofocus

Pros: Image Quality Dust

Summary: Very Sharp - You'll struggle to find anything sharper - on any system. A bit tricky as a walkaround lens but if you can fit it in the frame - it'll look good - portrait, macro even lanscapes. And did I say sharp? It's a 43s user's obligation to get this lens!

Cons: AF is a desaster, build quality

Pros: price

Summary: a good lens

Cons: Autofocus without limiter = outdated, tiresome,

Pros: Superb quality even excellent for macro use

Summary: The best lens I had so far. works well with the E-620

Cons: Slow focus and no focus limiter

Pros: Outstanding optical quality well built weather seals

Summary: Light and compact It is always in my bag

Cons: No focus limiter on a macro lens which causes the lens to hunt through the whole focusing range at times

Pros: Outstanding optical quality well built weather seals

Summary: If you are a Olympus user , there is NO reason not to own this lens in fact this lens along with a few others make the 4/3 system a very attractive option One can only wish that other stellar single focal lengths be made available for the Olympus system

Cons: Slow focus and no focus limiter

Pros: very useful macro and portrait lens.

Summary: I always carry it.