tony_b Posted May 2, 2003 Share Posted May 2, 2003 Just a curious question. Does anybody lnow why there is an electronic element, an IC, in the vivitar 2xTC for EOS ? I always thought that the connectors on the TC are only to let the body communicates with the lens as no actif electrical elements in the TC. Link to comment Share on other sites More sharing options...
bill_goldman Posted May 2, 2003 Share Posted May 2, 2003 The Canon extenders (teleconverters) have internal electronics in order to report the effective aperture of the lens/extender combination to the camera and possibly additional data. The Vivitar probably does the same. Other brands of teleconverters may or may not do the same. BTW, I believe Canon extension tubes also contain electronics for similar reasons. Link to comment Share on other sites More sharing options...
isaac sibson Posted May 2, 2003 Share Posted May 2, 2003 The 12mm extension tube has no electronics. The 25mm does. Link to comment Share on other sites More sharing options...
bill_goldman Posted May 2, 2003 Share Posted May 2, 2003 Thanx for the correction, Isaac. Link to comment Share on other sites More sharing options...
tony_b Posted May 2, 2003 Author Share Posted May 2, 2003 Thanks for your answers. But the body "sees" the same appearture of the lens with or without TC, as if the were no electronics in the TC. For example, suppose i Have f2.8, 1/60 s without TC, with the TC and metering off the same subject I will have f2.8, 1/15s (2 stops loss). It is normal to read the appearture of the lens (as in my axample) or the camera should read the apparent appearture (5.6)? Link to comment Share on other sites More sharing options...
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