i believe u are talking abt nickmak's way. his way only works for canon EF mount, not for the others. that's how they force the aperture to stay in that aperture as they use electronics on the lens to stopdown the apertureWitness said:nick's way i tink only works for nikon coz i dun tink canon got aperture ring on lens rite..
denniskee actually have tried using 2 extension tubes and wires between the 2 ext tubes on his canon cam to mimic the reversing electronic connector