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I got a new 3100 along with a Sigma zoom. The auto fucus does not work at all with the zoom. am I doing something wrong or it this normal and will I have to just get used to manual focus with this lens. My eyes arent what they used to be and I cant seem to get very crisp pics like this.I should...

I just got a 3100 and even reading the manual I can seem to figure out how to change the way pics are named in the camera its self. I want the file name to come from the time and date at the time. Right now it automatically saves as 0001 or 0012 and so on but repeats every time I dump the pics...