nick_brown11

<p>Thanks for the responses - you are right. I was metering with the lens set to M. I assumed that the meter would operate the same way as a modern DSLR.<br> Much appreciated, saved me sending the camera off for an unnecessary repair.</p>

<p>I've realised that my Mamiya 645 Pro is not metering correctly with the AE Prism Finder N but goes progressively out of sync at higher apertures.<br> I'm comparing the metering with a Gossen Digipro F light meter<br> Changed the camera battery<br> Cleaned and inspected all contacts between AE Prism Finder.<br> Tried different backs at different ASA/ISO values (I have 3 backs)<br> Checked and cleaned contacts between the backs and camera<br> Camera lens correctly attached with aperture arm engaged<br> For example, I meter a white object on spot metering with a constant light at ISO 400<br> f2.8 60th second - Matches Light Meter<br> f4 15th second - Light Meter says 30th second<br> f5.6 1/2 second - Light Meter says 15th second<br> f8 - LT flashing - Light Meter says 8th second<br> I noticed that the 645Pro has 1 more connection contact than the AE Prism N.</p> <p>Any ideas of what could be the problem please?</p>