<p>Ok. So this is the lab guy's fault (sigh).<br /> I have 4x LR44 bettery pack and i read somewhere that it could cause faster shutter speed because it has total of 6V but only 5.6V is required ! could it cause any problem ?<br /> Viewfinder is a little blue. The service guy told me that it is the coating in viewfinder glass. Also focusing thing is little tough. Thanks for the tips.<br /> I live in Pakistan and finding good film roll is difficult and B/W does not exist here. And hence good labs are non-existent. So i will have to import film rolls and search for processing chemicals and apparatus for home processing.<br /> Another thing, when i was shooting with yashica, there was a ring, foremost on lens called exposure ring saying "B", "auto" and a flash sign. I don't know how to use it and i changed it several times during shooting(which probably caused the underexposure).<br /> Also at some places i read that iso dial should be set same as film used but at some places it said that iso dial should be as twice as film roll e.g fujifilm 200 should be used with iso setting 400.<br /> And i don't know about metering like @wouter said "a centre-weighted or spot metering", i am unable to find info on that !<br /> Excuse my miserable English. I appreciate your help guys !</p>