Currently I have a Canon 60D, but after carrying it with me on a trip I have started to think about a lighter camera. I want the camera to be easier to carry around for long sightseeing/tourism trips, but still be customizable with lenses. Therefore I have started to look at mirrorless cameras.

As I have a Canon camera it would be nice to be able to use my old lenses on the new mirrorless camera. Canon has an official adapter for using EF and EF-S on their mirrorless cameras, but I have read that the focusing is slower when using this adapter than the native (EF-M) lenses.

Also when looking for mirrorless cameras on the internet there seem to be other brands which offers good cameras, where you can use third party adapters for connecting Canon lenses to them. But also for these adapters, I heard there can be some focusing problems.

My questions is: will my lenses work worse on mirrorless cameras from other brands than on Canon's own mirrorless cameras? Slower focus and/or other problems? Does anybody have experience with this which they can share?

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    It's not much of a win to save weight on the body if the lens dwarfs it. For your purpose, you want small and light lenses, too. If you want to use the good stuff, use the dSLR. If you want to pocket it, use the folding lens with slow aperture and mediocre performance. That's the situation I'm finding. Look at the Canon EF-S 18-55 f/2.8 (650g) next to a alpha-6000 (344g with battery): what's the point of going small/light if (compared to 70D only save 400g and not pocketable? – JDługosz May 25 '15 at 5:33
  • My plan is to get a mirrorless with a small native lense. It does not need to be pocketable but I want to be able to have it around my neck for 8 or more hours when walking around in a foreign city. My current setup during my recent trip weighted 1230 gram. If I would e.g. buy Sony a6000 with E 16-50mm it would only weight 460gram. But it would be nice to be able to also use normal Canon lenses, e.g. Canon EF-S 10-18/4,5-5,6 IS STM which is much cheaper than its Sony counterpart and I would be able to use it with both cameras. It only weights 240 gram. – eternitysharp May 25 '15 at 18:46
  • Hey i have the same dilemma that you had... have a canon 5d dslr with a couple of lenses too. On the lookout to buy my first mirrorless camera. Just want to know if you were able to buy your mirrorless already and which one you did you get? Thanks!! – user49338 Feb 29 '16 at 3:38
  • i know it's an old discussion .. but i have the same problem now ..do you find a better solution or explain at least your experience ?? – Soha Name Oct 23 '17 at 9:47

I don't think there's going to be a huge amount to choose from when it comes to adapting Canon dSLR lenses to mirrorless cameras. If you want autofocus and aperture control from the body, then you have to get a communicating adapter, and that's liable to be expensive, and the autofocus mechanisms being different between dSLRs and mirrorless, there's always going to be something of a performance hit across those two platforms. While using Canon lenses and a Canon adapter on an EOS M camera might get you an AF performance increase, I wouldn't expect there to be a day-and-night improvement between that, and say, a Metabones EOS to Sony E-mount adapter, given that the EOS M cameras aren't exactly lightning-fast tracking-AF performers to begin with.

Looking at the bigger picture of which mirrorless system is a good purchase candidate I think you're losing sight of the reason you want to move to mirrorless. Most of us go there to get a small, lightweight setup. And just swapping the bodies and not the lenses, too, doesn't really gain you a whole lot in terms of bulk. I think the path you're envisioning is good if you want a small lightweight second body, or you only plan on using the occasional EF/EF-S exotic lens. But if you avoid getting EF-M lenses, you're going to merely be swapping the 60D for an EOS M, but still carting all the same lenses around. And an adapter.

And if you do get EF-M lenses to go with an EOS M, the problem is going to be that there are really only two of them to choose from (18-55 and the 22), unless you live in Asia or Europe, at which point you have four to choose from. And that's still the smallest native lens lineup of all the mirrorless systems. Sony E-mount, Fuji X, and micro four-thirds have mindshare among the mirrorless enthusiasts for a reason--they're full systems. EOS M isn't one, yet, particularly for a North American customer.

Then again, I'm probably biased because I shoot both Canon dSLRS and micro four-thirds mirrorless. :D

  • Thanks for your answer. My plan is to get an mirror-less camera with some native lenses and use it when travelling around. I will of course still use my dSLR even if I get an adapter. The possibility to connect my old lenses to the new mirror-less camera is secondary, but it would still be nice to have the possibility. It is more important for me to have access to a larger native lens lineup. Sonys cameras look nice, but I will also take a look at micro four-thirds mirror-less. – eternitysharp May 23 '15 at 9:24

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