The Nikon D3100 has got external dimensions of 124mm x 96mm x 75mm (4.9" x 3.8" x 3.0") along with a weight of 505 grams (1.11 lbs) while the Pentax K-50 has sizing of 130mm x 97mm x 71mm (5.1" x 3.8" x 2.8") along with a weight of 650 grams (1.43 lbs). Take a look at the Nikon D3100 versus Pentax K-50 in the new Camera and Lens Size Comparison
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nikon d3100 weight with lens
