Electrice VS non

Hello all, I will have my 100MM 2.8 macro shortly and am already looking at some tubes to play around with. My question is how do the non electronic ex. tubes work? Obviously you will not have AF but how would you set the aperture? Would the lens just shoot wide open and have to be MF?

Was wanting to get a cheap set to play with but don't want to waist my money if I will not even get any use out of it.

Thanks

BigAlz1 wrote in post #8293606
Hello all, I will have my 100MM 2.8 macro shortly and am already looking at some tubes to play around with. My question is how do the non electronic ex. tubes work? Obviously you will not have AF but how would you set the aperture? Would the lens just shoot wide open and have to be MF?

Was wanting to get a cheap set to play with but don't want to waist my money if I will not even get any use out of it.

Thanks

As you say loss of aperture control is the problem with non contact ext tubes. You have to preset the aperture you want with the lens attached normally, set the aperture in Av mode- press the DOF preview button and remove the lens whilst jkeeping the DOF button depressed. The lens will keep that aperture until it is next attached to the camera normally.
Of course the downside of this is a rather dim viewfinder. Personally I'd get the more expensive electronic contact versions either via EBAY or if you are in the US, you can get a Pro-optic set from Adorama fairly cheaply.
Brian v.

one thing about the over priced Canon tubes is that they do function properly - I can get AF and ETTL using the 60efs on a 1D.

Kenko are a tad loose when attached but I don't think I have seen any real issue with them.