Excerpt: I'm using it as my "everyday carry" telephoto lens for Olympus E-PL1 camera. There are several catadioptric lenses on the market, including the old ones, but this is unique piece of gear, because it was designed for m4/3 system, therefore it does not have extra weight and size like others. You can easily fit it into very small bag unlike regular lenses with equivalent focal length (2x longer) and take it wherever you go.
Excerpt: This lens has a great feel. The all metal finish gives it the look and weight of a high quality lens. This lens was designed for m4/3 so it has a very small size compared to a full frame equivalent. It has good macro capabilities, and with 300mm, it leys you stay relatively far from insects so they won't be scared away. Unfortunately, the quality of the optics is not up to par with the lenses offered by Panasonic, olympus and sigma.
Excerpt: I was told that Minolta mades a very good 250 mm reflex lens. That would be about right for taking photos of birds and butterflies. I have been watching [*]auctions for that lens, and find it too expensive. I was wondering why doesn't some else make a similar lens . I am happy that Tokina is making one. This lens also saves me the trouble of having to make a Minolta to Micro 4/3 adaptor. For comparison, I also have a Lumix G vario 100-300 lens.
Summary: Not the greatest mirror lens I've used (the Tamron 350mm 5.6 probably takes the cake), but it isn't bad either. I personally love the out of focus "donut" effect. For the sheer portability, it's really a no brainer.
Summary: As the various reviews have stated, this lens is very hard to focus and the lens lacks contrast. Focus peaking in the camera body is very helpful. If one is very careful with focusing and using the lens/camera on a monopod or tripod, the resulting image can be good, not outstanding but good. Post processing can help the contrast issue. I decided to keep the lens.
Summary: This lens has me puzzled, but I am giving it thumbs up because it is a welcome addition to the M43 line and has a unique signature. Some people will hate this lens, so be sure you do your homework. I have mine coupled to an OM-D EM-5. Be sure to upgrade to 1.5 Firmware Update. Adjust Image Stabilization for a 300mm lens. I've been out birding with it and can see a a Nuthatch peck a peanut from 30 yards.
Summary: The good news: the optics seem good, and it is very light weight for the range. As you would expect from a mirror there seems to be no chromatic aberration. In other words, yes this is a real lens, not junk! The difficulty, no autofocus. The focus ring is VERY finicky, a 1mm error in rotation makes the difference between focus and blurred rubbish. And, guess what? You have no optical viewfinder on your MFT camera. The viewfinder on the back is not sharp enough.
Excerpt: Years ago I owned a Tokina 500mm mirror lens in the old Canon FD mount. The new Micro 4/3 mirror lens is very similar in concept. Don't expect it to be a brilliant long range lens; it is computed for medium to close-up shots, where it performs very well. It's great virtue is size and weight. As a South African I often visit our game reserves and work in my van, where a mirror lens is ideal. Some people dislike the bokeh with it's doughnut highlights but I don't.