Olympus M. Zuiko Digital ED 12-100mm F4 IS Pro Lens, suitable for all MFT cameras (Olympus OM-D & PEN models, Panasonic G-series), black

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This is great news for users that might be leery of a Micro Four Thirds lens that 'only' opens up to F4, as well as those users that want to take advantage of the high-res shot mode. Which is what you apparently didn't understand when you asked "So you can close aperture on 135 format but you can not open it on MFT?

So you can achieve the m43 look with FF, but you can also get lower DOF, lower ISO, wider aperture on FF if you want.The existing 12-100mm F4 IS PRO (review here) is an exceptionally sharp lens for such a long zoom range.

At that time, it was Olympus newest lens and was rumored to be sharp and have great image stabilization. If you want a compact camera that produces great quality photos without the hassle of changing lenses, there are plenty of choices available for every budget. Tamron introduced the super zoom and they are responsible for the well deserved terrible reputation that super zooms have.I would welcome, if it focused at shorter distances on longer focal lengths, which would enable me to photograph even smaller species of animals such as spiders. Equivalent to 24mm to 200mm on a full frame sensor" : simple statement about FOV, just avoiding '84 to 12 degree' notation. on FF and thus it is a lens, which can be produced, as other manufacturers already produce similar lenses.

Characterized by its f/4 constant maximum aperture, this lens offers consistent performance throughout the zoom range to suit both stills and video shooting. But apparently it wouldn't take long for me to be kinda disappointed in the distortion on the Tamron. Furthermore, There are quite a lot of µFT users who have other reasons to use µFT than the compactness and low weight of the stem.

You'll struggle to really blur the background fully away unless you're real close to your subject and at near maximum zoom.