I have come to this forum seeking advice regarding the micro-4/3 system and as such this will be a frank post. Sorry if this is a bit disjointed. I am currently a Canon user, with my kit consisting of - Canon EOS 5D Canon EOS 30D (two) Canon EF 24mm f/2.8 Canon EF Compact-Macro 50mm f/2.5 Canon EF 28-70mm f/2.8L USM Canon EF 70-200mm f/4L USM Canon EF 400mm f/5.6L USM Of this, the EOS 5D with the 70-200mm f/4 is used the most and, strangely, the 28-70mm the least. It is all old gear that I've had and used for many years. Two of the lenses (the 24mm and the 50mm) have now given notice and the 400mm needs to be cleaned. The replacement of the 24mm is ridiculously overpriced and there's none for the 50mm. The cameras are showing their age and the accumulation of years of dust on the sensor. Neither the 6D nor the 5D Mark II offer me any real upgrade over the 5D, apart from more megapixels as I don't do video. The 5D Mark III is somewhat beyond the reach of my wallet, unless I sell all three cameras and all the lenses apart from the 70-200mm (for obvious reasons). With that last sentence in my mind, I began wondering if a complete switch to micro-4/3 is possible, especially since that will also solve one of my biggest gripes about my current gear ... the humongous size of everything. Just a bit more background ... Before starting to build this Canon kit (when "going" digital), I used a Pentax S1a and Spotmatic SP, with 55mm f/1.8, 50mm f/1.4, 135mm f/3.5 and 200mm f/5.6 lenses for more than 25 years. I still have it all, plus an SMC TAKUMAR 45~125mm f/4 and an S-M-C TAKUMAR 24mm f/3.5 bought in a secondhand shop a few years back. (The latter doesn't work on the 5D.) I'm not into shallow DoF and use the 70-200mm at f/5.6~8 and the others at f/8~11 most of the time. No RAW, just JPEG ... although I have tweaked the in-camera settings severely to suit my preference. I don't particularly like short zooms or extreme-wide-angle lenses. And personally feel that autofocus is the single most detrimental invention towards photography ever, unless coupled with "eye-control". So, given that I mainly use the 5D with the 70-200mm, the 50mm and the 400mm, is it possible to replace this with a micro-4/3 setup? But before you answer, two points to keep in mind: (1) a second bugbear about my current gear is the lack of weather-sealing; and (2) I live in South Africa, so Panasonic stuff is by special order from B&H only (but Olympus is sold and serviced here). All input will be greatly appreciated.