[FONT=Arial, Helvetica, sans-serif]I have a old pentax mg as one of the cameras given to me from my dad and i was wondering If my camera is auto exsposure only what does that mean? if i have my cam set to auto will it automatically set the speed and apeture? or do i always need to set the apeture? just abit confused form what some ppl r tellin me[/FONT] also how do i know which fstop to use for example, like if i want the most depth of field should i just straight up use f22 or what? lastly has anyone heard of the brand astron???