Help with "release shutter without lens"

Hullo everyone.
I'm intended to buy a Rokinon fish-eye for my Canon 5d mark III. As we all know these Rokinon lenses dont have any electrical contact neither a chip that would make the lens recognized from camera. Certan Canon like the M line needs a setting named "release shutter w/out lens". I went carefully thru the ita/eng manuals of my camera but I didnt find any setting about it. Nothing under any of Custom Function nor in any menu of any "wrench" .. I found only "release shutter without card".
Any suggestion or help ?

Thank you.

Mauro

 

i don't have that camera but i just spent 30min going through the online manual and couldn't see it mentioned anywhere
i'll be very interested in the answer to this too
have you tried just taking an image without the lens attached
is it the type of camera that just fires any way, no setting needed?

 

Welcome to the forum,chellm . Your camera should work quite fine without the chip. Your camera will work without a lens on it or in this case a manual lens.
I use old film lenses from a variety of makers and a 85mm f1.8 from china, similar situation, no chip or electronics. I put a adapter on the camera, then fit the lens to the camera. Focusing is done manually, same as your lens you intend to buy.
Put your camera in M or Aperture priority.
To achieve fine focus, put the camea in live view and press the + button to zoom in on your subject, then press the + button a second time to further get a finer focus then press athe + a third time to go back to normal view. It is then a matter of composing the shot. If you do not want to go through this procedure, just adjust the focus as normal. I tend to be a bit pedantic when it comes to focusing but that is just me.
If you are worried about capturing a shot with manual focusing then use zone focusing.
prefocus in the area you are shooting at and set the aperture to f16.
Your images should come out pin sharpe.

 

This might help.
https://canoncanada.custhelp.com/ap...eleased-when-a-lens-is-not-attached?-(eos-m5)

I had to change the setting on my m6. You have to put the camera in manual mode and then go to custom settings at the end of the list in menu.

 

I answer to all by the same post:
1 - yes, the manual of Canon 5d mark III doesn't mention any setting for lenses w/out chip / electronic / dedicated software lens. As I said already there is just a mention of a special settting to release shutter **without card**.
2 - thank you for the very extended answer and clearifying explanation. More or less what you have said is what I expected to find coupling 5d and rokinon lens.
3- Thank you for the link which explains clearly what I should had go thru if 5d was instead necessiting some special setting.

Ok grazie to all..

Mauro