07-22-2010, 07:46 PM
[quote name='wim' date='22 July 2010 - 05:34 PM' timestamp='1279816442' post='1245']
Ok, something is at play, and the only way to find out is make sure all variables are eliminated except one. Which means setting up a testing environment indoors, with controlled lighting, test all metering modes, too, and take photographs.[/quote]
I do not have the facilities and resources to do that.
[quote name='wim' date='22 July 2010 - 05:34 PM' timestamp='1279816442' post='1245']
I have used many MF lenses, and they all metered differently, at different f-stops (closing the lens down manually). After a while you get to know the lenses, so I didn't really care too much about this. I do know. I also know that my C/Y 50 F/1.4 overexposes by more than 1 stop wide open on my Canon bodies, and is accurate from F/2.8, +/- 1/3 of an f-stop. What causes that I don't know. Personally, I took it as a given. Similarly, my Leitz-R 60 Macro. It underexposes at any f-stop, from about a 1/2 wide open to 1/3 at the others.[/quote]
I must admit this is the most amazing thing I have ever heard. I never thought things like this exist with such magnitude. Thank you for your insight. Nevertheless, when shooting with the Mamiya (i.e. actually taking pictures, not testing) I never had to apply any EC. I always assumed it's because the camera meters TTL and does not care which lens is attached.
Ok, something is at play, and the only way to find out is make sure all variables are eliminated except one. Which means setting up a testing environment indoors, with controlled lighting, test all metering modes, too, and take photographs.[/quote]
I do not have the facilities and resources to do that.
[quote name='wim' date='22 July 2010 - 05:34 PM' timestamp='1279816442' post='1245']
I have used many MF lenses, and they all metered differently, at different f-stops (closing the lens down manually). After a while you get to know the lenses, so I didn't really care too much about this. I do know. I also know that my C/Y 50 F/1.4 overexposes by more than 1 stop wide open on my Canon bodies, and is accurate from F/2.8, +/- 1/3 of an f-stop. What causes that I don't know. Personally, I took it as a given. Similarly, my Leitz-R 60 Macro. It underexposes at any f-stop, from about a 1/2 wide open to 1/3 at the others.[/quote]
I must admit this is the most amazing thing I have ever heard. I never thought things like this exist with such magnitude. Thank you for your insight. Nevertheless, when shooting with the Mamiya (i.e. actually taking pictures, not testing) I never had to apply any EC. I always assumed it's because the camera meters TTL and does not care which lens is attached.