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You'd rather get one of the better adaptors then use a Canon body to change the aperture. It's more practical.
The problem is that very few offer aperture control, which is why the ones that do fetch such a premium. The less expensive ones fake it by adding aperture blades behind the lens, which doesn't look as good, is less precise and sometimes adds an extremely undesirable vignette. No thanks!Edit: Just saw the price of the RedRock adaptor. The Canon body seems like a cheap but inconvenient option or use one of the other adaptors that offer aperture control
I'd like to move over to Pana, but have already invested in 17-55 f2.8 and 70-200 f4 (nonIS). Anyone have experience with this stuff.
You've got more choices. One an adapter with aperture control-
http://www.amazon.com/Fotodiox-Adap...395865042&sr=8-2&keywords=fotodiox+eos+to+m43
two....also an eos to m43 RJ focal reducer -
http://www.rjcamera.com/ocart/index.php?route=product/category&path=20_65_69
That would increase your available focal length choices, but limit you to not being able to change aperture.
Except 12-35 doesn't have real manual focus. Even if you go to manual focus it's still servo driven and not repeatable. I did not test 35-100, but I would assume it's the same deal. Olympus 12-40 F2.8 has clutch mechanism, and actual manual focus with hard stops at both ends. So on that token 12-35 is not in the same range as Canon 17-55, as Canon also has real manual focus.If you don't need the lenses for anything else, just sell them off and get the Panasonic 2.8 zooms (12-35 and 35-100). They'll perform better and be smaller and lighter.
I would not use either of those!
The first one has its own aperture blades that exist BEHIND the lens, which is a bad idea for a few reasons (mainly, it can cause vignetting and lack of precise F-stop control, but also effects the bokeh quality because blades are a different shape than the ones in your lens). It's basically a fake solution.
The second one is a Speedbooster knock off. Speedboosters are great, but the knock offs not so much. I don't have experience with that exact one, but so far all the inexpensive copies I've seen horribly degrade the image in a very noticeable way. Usually adding another layer of glass is bad idea to any optics, but the glass in the Speedbooster is precision made from Caldwell, and is built to a high enough specification that it doesn't add any noticeble imperfections to the image, while actually sharpening and reducing things like chromatic aberration in the process.
I don't have to tell you that not all optics are created equal- I love the speedbooster concept, but right now they're the only one worth getting IMO. The others appear to be sourcing some no-name mimic factory in china to make the glass elements.
Since the OP is discussing using a rather expensive Canon-branded lens (and not a third party like Tamron for half the price), I think the quality that comes from authentic products (both in optics and aperture blades) mean something to them.