I have zeroed in on the E-PL1 as my preferred m4/3 body. I plan to use various manual focus F-mount macro lenses on it via RJCamera adapters. The macro lenses I have typically range in weight from 450gm to 650gm. I'll almost always be shooting from the tripod and use a arca-style body plate on the PL1 body. Are lenses with weights in above range OK to use on the PL1 for the long term (if it lasts 2 years I am happy)?