There is a quirk in the A2's (and EOS 5's) metering system because of the special "bright" focussing screen used in those cameras. When using the A2 with either converter, and lenses 300mm or longer, you need to apply some correction to the reading the camera gives you. (Remember, the body displays the correct effective aperture when using Canon extenders.) If you use an incident meter, the camera meter has nothing to do with it, and no correction is needed. Bob Atkins has a much more precise explanation than this, and this link should get you there:
<http://bobatkins.photo.net/info/faq30/a2comp.html> I would quibble with one point he makes. He states that "The EOS 5/A2/A2E focusing screens are optimized for brightness. As a result, they pass disproportionately more light to the metering system". If more light is going to the screen, it stands to reason that less light is going to the meter. This would explain the negative correction required to obtain the correct exposure on the film. I think I see this effect with even the 200/2.8 and EF2X. It reads a bit lower than I would expect. I just trust my gut instinct, and the exposed chromes are usually just fine. Geoff Doane > > - ----- Original Message ----- > From: "Tom Williams" <[EMAIL PROTECTED]> > ............. Then theres a special note for the A2 that just sez "set > > -1/2-stop exposure compensation with the EF1.4X II or -1 stop with the > EF2X > > II". My question is I'm I opening up that 1/2 stop "after" the camera > > meter gives me a reading? What about compensation when using a incident > > meter, just open that 1/2 stop again after I meter the scene? > > Tom, > You tell us above that the instruction is to set minus half stop (-1/2) for > 1.4x and minus one stop (-1) for the 2x, but then go on to ask about opening > up for compensation ?? The instruction as quoted by you is clearly to close > down to compensate. I cannot understand why though and suggest you check > again. It would be more logical to open up by those amounts when using > convertors. * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
