I shoot for magazines, and it's not really about the camera. Almost any digital camera will work fine, as long as you have good lighting. I shoot on a white background (such as a sheet of copier paper), and shine some light behind the pen to lessen shadows. Lights should be off to the sides, so there is no glare. Bounce flash off the ceiling if possible. For small objects like pens, I sometimes lay them on a piece of translucent plastic (frosty Plexiglas) and light from the bottom as well. It's easy to get carried away with editing software, but generally all one needs to do is crop out the excess background (leave some white space all around), and then perhaps a mild adjustment to exposure (brightness) and color (saturation). Beware of over-sharpening. If you have Photoshop, you can play with color balancing to get true resolution. Sometimes lights mess with color (fluorescents can be green, incandescents tend toward yellow), but most digital cameras will automatically compensate. White daylight is about 5800 Kelvin: most light bulb packages will list the color (e.g. 3400k), and numbers below 5800 will be softer and more yellow.
