Sorry for the long post, a little background first... I shoot both photo and video professionally. I've used both Canon & Nikon systems through the years, including the original 1D, 1D2, 1Ds2, 5D2, 5D3, D300, D700, D800 and D3. I've had great glass from both companies, including lots of fast primes (14L, 24L, 35L, 50L, 85L, 135L, 70-200 f2.8, Nikors 14-24, 24-70, 70-200 etc). You get the idea. TBH I'm getting tired of the size and weight as well as the soft front/back focusing that comes with DSLR systems. I also shoot a lot of video and having shot with video cameras forever, I went through the DSLR phase like many, then finally settled on the C100 for it's audio/XLR, low light and awesome 1080p footage. --- Micro-Four-Thirds --- I first tried the MFT system with the Panasonic GH1 a few years ago, mainly experiment with the hacked firmware for video, but I was less than impressed by either the photo or video capabilities. The biggest problem for me back then was the lack of fast / good glass. I sold it within 6 months of first trying it and went back to Canon. However, I've recently purchased a GH4 to begin playing with the 4K video capabilities and it soon became my go-to camera for video, even over the awesome C100. I've started to acquire more native glass, as well as the EF --> MFT adapter, but I'm actually liking the MFT format generally a lot now due to the availability of more great glass (e.g. the PL 42.5 f1.2). For photography I'm wondering if the EM1 would be an appropriate purchase to run along side (rather than replace) the GH4, but to effectively replace my large DSLR gear. The things that particularly interest me, and drew my attention specifically to Olympus are the IBIS and the live bulb. So a couple of questions: 1) Regardless of manufacturer's claims, how many stops do you gain in low light / slower shutter speeds with the EM1 IBIS? Is it one, two, three, four? Just to be clear, how slow can 'you' hand hold at 12mm, 20mm, 42.5mm using the EM1 IBIS? 2) Does the live bulb work well enough to actually figure out when the expose is correct for longer exposures ? I'm thinking 5-30 second exposures on dark evenings.... 3) Have you made the change from Canon / Nikon to the EM1 and still use it professionally? I'm wondering if this is going to be yet another 'run along side' system of it it's actually realistic to replace the Canon/Nikon gear in the short / medium term. My back would surely thank me! 4) What flash guns do you use / recommend with the Oly system? Obviously Oly has their own, but are there 3rd party systems that also work well that don't cost an arm and a leg? OK that was four questions..... Oh, one more question.....what would you say are the negative points of the EM1 compared to using a DSLR? I'm really not bothered about what clients think, they hire me because they know I can do the job, not because I'm toting a big white lens, but generally, what should I be aware of that has caused you problems?