Underexposed LCD screen query

Hi,
I have just bought a used 5d and have a question that I hope someone may be able to help with....
I have an old manual focus lens with an EOS adapter that I have used on my other camera (450D) and everything works fine, but when I fit this lens to my newly acquired 5D (using same adapter as on 450D), the LCD image is very very underexposed. I haven't had chance to check whether the saved image is also underexposed or if it's just the LCD image.
I have found one similar issue on another forum and will try that but wondered if anyone here had come across this issue before ?
Thanks

DeanB72 wrote:
Hi,
I have just bought a used 5d and have a question that I hope someone may be able to help with....
I have an old manual focus lens with an EOS adapter that I have used on my other camera (450D) and everything works fine, but when I fit this lens to my newly acquired 5D (using same adapter as on 450D), the LCD image is very very underexposed. I haven't had chance to check whether the saved image is also underexposed or if it's just the LCD image.
I have found one similar issue on another forum and will try that but wondered if anyone here had come across this issue before ?
Thanks
Is it possible that your old lens isn't a preset lens, and that therefore the image presented to the LCD doesn't reflect the lens's maximum aperture? If, for example, the lens was intended for a rangefinder camera, there would be no need for a preset diaphragm. If that's the explanation, the brightness of the image in the viewfinder should vary with the aperture setting. Did you notice such an effect on your 450D? (I'm guessing that the 450D didn't have live view; my 400D didn't.)
Bob
Boston, Massachusetts USA

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