Asad Ali Posted August 31, 2009 Share Posted August 31, 2009 <p>My canon speedlight 420 ex mounted on canon 40D and 400D rebel with 24mm-85mm zoom lens many times causes high over exposure (completly flat) on P and Auto modes, and at same time quite under exposures (totally dark) and behaves quite in-consistently on these cameras.<br> Any help,<br> Regards<br> Asad</p> Link to comment Share on other sites More sharing options...
PuppyDigs Posted August 31, 2009 Share Posted August 31, 2009 <p>Poor conductivity on hotshoe: clean contacts and/or tighten hotshoe rails.</p> Sometimes the light’s all shining on me. Other times I can barely see. - Robert Hunter Link to comment Share on other sites More sharing options...
pturton Posted August 31, 2009 Share Posted August 31, 2009 <p>Puppy Face is right on the money with his response. The low voltages used for signalling between camera and flash do require good electrical connections at the flash shoe.</p> Link to comment Share on other sites More sharing options...
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