http://www.nikonchat.com/nikon-3100-shutter-speed/

digital SLR camera that you recommend?
I'm not a photoghrapher but I love taking pictures of nature and when I go rock climbing and need help finding a good camera that takes good pictures with a fast shutter speed. so we recommend the Sony A550, the Canon EOS Rebel T1i, or nikon 3100? if you have any other camera in mind please feel free to list. maintain the price range below $ 800
It's a bit difficult to answer this question without being a bit biased. I am personally a Canon person, and all my videos and photographic equipment Canon has always been since the days of my first Snappy when she was 8. They make fantastic products. Right now I have the EOS Rebel XSi, and I can only say good things about him. However, I have also friends with Nikon digital SLRs and Nikon are just as adamant as I am from Canon. The cameras you mentioned, manufacturers are fine with the interfaces User exceptional even for beginners like you. I can not speak for Sony, since they do not know anyone who owns one. A great resource for you can be dpreview.com, and which offer very good reviews in almost any digital camera you can think of the leading manufacturers, along with the star of comparisons of the cameras that you mentioned.
Nikon D3100 DSLR – Shutter Release Modes