NEVEC - this seems to need more experimenting... I did some testing with my EOS 55 and the 550EX.
It was a very confusing test to say the least. I repeated it many times in many ways. Several times I was convinced that I was observing NEVEC, but only with CF8=1, and only around EV 7-9 at ISO 400. Then later it wouldn't happen at all. Now I'm convinced that it 'hardly ever' happens :-) And I'm not sure if it's because of CF8, the metering mode, or the ISO. My results when NEVEC did happen were generally only a half stop change, but I did manage to see a one stop change a few times. And below EV7 or above EV10 I never got it to happen. I think it does happen sometimes, but it's not consistant. Sometimes it definitely does. The only times I ever got it to happen was with CF8=1 and centre weighted metering around EV7-9 at ISO 400. I did get it to happen more than once at different times, but it did not happen more than it did happen. And in the end I gave up testing because I could not get it to happen any more. I always did the test when a slight camera movement did not change the metering, to make sure switching the flash wasn't moving the camera slightly and changing the metering. The whacky thing was it only happened around the transition point. That is EV7-9 at ISO 400. Below that it didn't happen, above that it didn't happen. My camera does not switch metering modes when the flash is on, that is something else I tested, even when CF8=1. I think it makes sense that CF8 is only active when the camera is in partial metering mode. The camera does not switch to partial metering when the flash is on, even though CF8=1. If the camera is using partial metering, CF8=1 does change the metering to go with the active focus point, rather than the centre point. I tested this with a dark object under only one focus point, with flash on and with it off. Using centre weighted or evaluative, the metering does not change with the focus point when CF8=1. No wonder this is an undocumented feature. I now wonder if it really happens all the time on those cameras which tested that it does apply. Or if it just happens sometimes. Anyway, since it happens so rarely, I'm not going to worry about it on my camera :-) Anyone else care to test their Elan IIe and try and get it to happen? Jim Davis * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
