<p>Hi I bought a Hasselblad 500CM a few months ago and I love it, but it did empty my wallet so when it came to metering I thought I'd get my old Canon Aceshooter A620 set it in M mode, set the ISO accordingly and tweak the shutter speed and aperture values until the image on the screen looks right. The results I got looked pretty good most of the time but I do think they could be better. <br /> Until now I've used only 400 ISO film however I'm going on a trip soon and will carry the following:<br /> KODAK PORTRA 400, KODAK EKTAR 100, ILFORD HP5 400 and ILFORD DELTA 100.<br /> What can I do to better the accuracy of the metering? Should I rate my film at half box speed? I had a bit of hard time finding much info on the subject so any advice would be great!</p>