Thinking of something narrower: Panasonic 42.5 F/1.7, Olympus 45mm F/1.8 or Sigma 30mm F/2.8

neil holmes wrote:

Hithertoo wrote:

If I got an EF adapter I have a bunch of lenses that I can borrow. I would suspect the issue with the EF adapter is the slow AF speed. People say the Panasonic 20mm F/1.7 is slow because of its focus motor, and it is to a point, but on top of the fact that EF lenses generally require a PDAF sensor (excepting the EOS M), most Canon lenses have the same sort of focus motor as the Panasonic 20mm F/1.7. That is slow and noisy screw drive lenses.

It's an interesting prospect but I would have to at least own an E-M1 first and then I may think twice about it. Adapted lenses no matter on the format including Sony E mount (where there are numerous AF adapters) or Canon EF mount, are always slower than what they would be on a native camera.

The Canon 40 2.8 STM at least is NOT slow to focus....not on my CDAF GX7 anyway.....it is pretty much native in focus speed.

It did have a lot of distortion before the firmware update but is fine now.

How does firmware affect distortion? Which firmware are you talking about - camera, lens, adapter? MFT bodies correct distortion with MFT lenses, but I'd be very surprised if Pan/Oly were building in corrections for something as alien as a Canon 40 on Kipon.

In low light it is a bit slower but not really any more than many native lens.

What lenses are you thinking of? There are a few f2.8 native MFT primes, but not many. The only ones I can think of are the Pan/Leica 45, which is a macro, and the Sigma 19/30/60, which are all APS lenses with MFT mounts.

Still works fairly well in low light with a GX7 (EV -4 AF is ok).....which is also much better I think since the firmware update.

One thing that is still a small issue is it keeps trying to focus when not being used so will drain the battery if not turned off when not using it.

Do you have Quick AF turned on?

Touch AF and touch shutter work great with the 40 and the Kipon (as does he 135 f2 L Canon too).