I recently bought one of the new Panasonic GX850 cameras (GF7 update). It's a great camera, but the lens that comes with it (12-32mm short zoom) isn't wide enough for a lot of the photos I take. I bought one of Panasonic's new 40-140mm zoom lenses, but this lens is too big for this small camera. Then I stumbled upon the 35-100mm f4-5.6 (rather than the newer but larger f2.8 version, which is also significantly more expensive). The maximum aperture of f4 doesn't bother me as I almost always shoot at f5.6 or f8.0. I bought this lens from Revain as they were the only seller who still had a silver version (I wanted a silver because my GX850 is silver). Either way, this is a beautiful gem of a lens. Small, light, with excellent optics. I've read that some people say the edges aren't very sharp. This does not apply to the lens I bought. It's equally sharp edge to edge (trust me, I do extensive testing every time I buy a new lens). Highly recommended (I got mine from Apollo Photo because they are an American vendor with a high satisfaction rating).
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