Bill,
Tom hit it right on the head all the way around! I couldn't have said it better. This site is locked into "light boxes", and advice that your pen is "overexposed" here or there that I have seen here countless times is marginally true....the overexposure some people elude to, is as a result of uneven lighting.
A "light box" is actually a "lighting tent" a "light box" is an illuminated box to view slides or transparencies on. Use the Southern exposure advice or if that is not available use indirect light, never use direct light unless it is for a desired effect. Lighting tents are used for in-studio photographs if you do not have the right timing or light availablity or have a products that is larger than ours. The sun is free, and you can with a little experience, achieve as good of results. I have photographed more than 1400 weddings in my career and have used window light at most of them.
As for the "G" series of cameras, they are Canon's high end p/s(point and shoot). I owned a camera store for twenty+ years in addition to my studio and most of the G's I sold were to people that had Canon DLSR's and wanted a good P/S to take with them here or there, that wanted to use their flash or wanted some exposure control.
They are fine, well designed, high quality cameras, but pricey. As mentioned, you certainly do not need all that to take good pen photos. If I learned anything from owning a mini lab for many years, I learned that many of the people taking amazing photos are doing so with some of the worst equipment, quality is often in the tricks we learn and the practices we use.