Need help scanning

[EcoLeica]

ive been scanning my negs for the past year using a canon 8600f scanner. Ive just been using the default mode but for some reason the other day my photos have come up as really small photos (5cm in length). I usually scan at 1600dpi. Can anyone direct me to a good site for scanning or offer some tips because i guess i should learn about scanning in more depth

Cheers

[Tuolumne]

This site is very good, and so is the manual sold at the site:
http://www.scantips.com/basics13.html

I've learned alot from this book:
http://www.amazon.com/Scanning-Negatives-Slides-Digitizing-Photographic/dp/1933952016/ref=pd_bbs_1?ie=UTF8&s=books&qid=1198650024&sr=8-1

Good luck with your scanning.

/T