Kevin is right on the money. I usethe Swarovski Laser Guide's for bowhunting alot. They offera good range finder coupled with great 8x30 optics but are costly. They fit comfortly in your hands and are light weight. While they do deliver more light than a regular ranger finder a set of good binoculars with at least 40-42 mm objectives are better for seeing in low light.

Here's a picture of the Laser Guides compared to a set of 10x42 SLC's...in which they are not all that big compared to the 50mm's.