Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Sigma DP1 Merrill and Nikon P310 side-by-side from the front, back and top in their relative dimensions. Sigma DP1 Merrill has external dimensions of 122 x 67 x 64 mm (4.8 x 2.64 x 2.52″) and weighs 330 g (0.73 lb / 11.64 oz) (including batteries). Nikon P310 has external dimensions of 103 x 58 x 32 mm (4.06 x 2.28 x 1.26″) and weighs 194 g (0.43 lb / 6.84 oz) (including batteries).
Below you can see the front-view size comparison of the Sigma DP1 Merrill and the Nikon P310. Nikon P310 is clearly the smaller of the two cameras. Its body is 19mm narrower, 9mm shorter and 32mm thinner than Sigma DP1 Merrill.
Here is the back view size comparison of the Sigma DP1 Merrill and Nikon P310.
Now lets look at the top view comparison of Sigma DP1 Merrill and Nikon P310.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon P310 is significantly lighter (136g ) than the Sigma DP1 Merrill which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Sigma DP1 Merrill nor Nikon Coolpix P310 provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Nikon P310's 3.00" LCD screen is slightly larger than Sigma DP1 Merrill's screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.