<p>Hi there,<br /> I was checking with my spot meter what were my lightest zone compared to the darkest zone. I was using a Sekonic 558 light meter - spot meter. Thus, when using the spot meter, like most of us are knowing that we have to go back to ambient light metering while turning the right knob to do so - Well I did not do so! Checking around my adjustments on my 4x5, I took the reading and then 'snap', I took the pictures. Before repacking, I concluded on my mistake and took a real reading which was very close to the sunny 16 rule! I did not have the time to take some more shots and I did not had any other film holders ready!<br /> I deducted that I was, at first, 3 stops pushed from an Efke 25 sheet film! So the real measure was taken at 200iso!! What can I do now that nothing is available on the web for such a situation!?<br /> Thanks for helping for some important shots!!<br> I took some shots at 200iso at home to experiment on developing time.<br> I use regularly HC110 developper with a high dilution (US sirup - bought from Canada)</p>