Canon EF lenses on M4/3 body, anyone ever done it?

[Swissy]

The reason i'm asking is i picked up a Focal Reducer Speed Booster Canon EOS EF lens to Micro 4/3 Adapter, for quite cheap and for the life of me i can't get it to work with the only EF lens i have to hand, which is a Canon 50mm STM lens, my other EF lenses are out at the moment, so can't try with those just now.

This lens is definitely EF and not EFS so should work, and i know focus by wire is not great but i just can't get focus no matter how much i try, i know this is user error but what am i doing wrong?

 

[HarveyM]

It would be useful to know which Speed Booster and which camera body, although it looks like you are using a Lumix G80 from your posts. The Metabones versions should autofocus on Panasonic bodies but apparently not yet on Olympus bodies. The firmware on the Booster needs to be updated to achieve Panasonic control of the autofocus. Other makes are Commlite and Kipon, the former seems to have a reputation for being unreliable or even not working out of the box from new. I don't know anything about the Kipon version and there may be other makes I'm not aware of. I have an EF to M43 Lens Turbo ll but this has no electronics in it, so I use an additional OM to EF adapter and use manual OM lenses.

 

[Swissy]

It would be useful to know which Speed Booster and which camera body, although it looks like you are using a Lumix G80 from your posts. The Metabones versions should autofocus on Panasonic bodies but apparently not yet on Olympus bodies. The firmware on the Booster needs to be updated to achieve Panasonic control of the autofocus. Other makes are Commlite and Kipon, the former seems to have a reputation for being unreliable or even not working out of the box from new. I don't know anything about the Kipon version and there may be other makes I'm not aware of. I have an EF to M43 Lens Turbo ll but this has no electronics in it, so I use an additional OM to EF adapter and use manual OM lenses.

Sorry, bit more info it's a Camdiox focal reducer/speed booster, correct i'm using it on a Panasonic G80, also tried it on a EM5 Mk ii same result, not working.
This is also manual focus, no electrical contacts, but it wont focus manually, i thought it might just be the 50mm STM.

 

[Phil V]

Sorry, bit more info it's a Camdiox focal reducer/speed booster, correct i'm using it on a Panasonic G80, also tried it on a EM5 Mk ii same result, not working.
This is also manual focus, no electrical contacts, but it wont focus manually, i thought it might just be the 50mm STM.

The 50mm STM focus ring isn’t a mechanical connection IIRC.

Try some different lenses without an STM

 

[Swissy]

The 50mm STM focus ring isn’t a mechanical connection IIRC.

Try some different lenses without an STM

I had a feeling it was this particular lens, unfortunately my partners have all my other lenses at the moment i'll post back on here as soon as i get chance to try it on one of those.

Thanks.

 

[HarveyM]

All EF and EF-S lenses (EF = Electro Focus) focus by electronic motors with some rare exceptions like the high magnification MP-E macro lens. It won't matter if these are STM, USM or whatever, if there is no communication to the lens, it's not possible to focus it. Same applies aperture control, if there is no communication to the body, the lens will be wide open only. There is a risky work around which involves something like setting the F stop on a Canon body and then removing the body with the power still on, not really a real world solution. Some adapters have a quasi iris control external to the lens itself but these probably aren't much use for decent image quality. Canon FD lenses are completely manual lenses but rather old now and a different mount needed, FD to M43.

 

[Swissy]

All EF and EF-S lenses (EF = Electro Focus) focus by electronic motors with some rare exceptions like the high magnification MP-E macro lens. It won't matter if these are STM, USM or whatever, if there is no communication to the lens, it's not possible to focus it. Same applies aperture control, if there is no communication to the body, the lens will be wide open only. There is a risky work around which involves something like setting the F stop on a Canon body and then removing the body with the power still on, not really a real world solution. Some adapters have a quasi iris control external to the lens itself but these probably aren't much use for decent image quality. Canon FD lenses are completely manual lenses but rather old now and a different mount needed, FD to M43.

The adapter is being sent back as it was advertised as allowing you to use Canon EF lenses on a M4/3 camera, no mention of it not working with STM lenses.

 

[Phil V]

All EF and EF-S lenses (EF = Electro Focus) focus by electronic motors with some rare exceptions like the high magnification MP-E macro lens. It won't matter if these are STM, USM or whatever, if there is no communication to the lens, it's not possible to focus it. Same applies aperture control, if there is no communication to the body, the lens will be wide open only. There is a risky work around which involves something like setting the F stop on a Canon body and then removing the body with the power still on, not really a real world solution. Some adapters have a quasi iris control external to the lens itself but these probably aren't much use for decent image quality. Canon FD lenses are completely manual lenses but rather old now and a different mount needed, FD to M43.

As far as I can tell, the OP knew it wouldn’t auto focus, but he intended to manually focus.
Here is where the stm lenses are an exception, because they’re a fully electronic focus mechanism, so unlike a USM lens, without power the focus ring isn’t connected to the focus mechanism. So there’s no manual focus.

 

[Swissy]

As far as I can tell, the OP knew it wouldn’t auto focus, but he intended to manually focus.

Yes and yes

The Metabones autofocus adapters are around £350, to much for occasional use.