Angel, I cannot answer your question about the use of NiMH, because I have yet to try them in my 645n. This is because the alkaline batteries last so long in them. I recall checking with a battery checker just about every time I use my camera after it has sat a while and to be honest I think I have only had to replace the batteries twice in the few years I have owned mine. I even share the batteries between the two bodies I have!
You should be fine with NiMH batteries, but don't feel like you have to use them to save on batteries, the 645n is quite stingy in using them up. I am still on the original battery in my 67 too - to lazy to try to figure out how many rolls I may have shot in medium format... :-) Cesar Panama City, Florida in Baltimore, Maryland -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
