The best price for Nikon Action EX 10x50 CF is $319.00. This is presently the cheapest offer found from comparing prices from 3 shops in New Zealand and one overseas retailer. The average rating is 4.5 out of 5 from 2 reviews.
The larger the diameter, the more light is captured. A diameter of 30 mm suffices during day-light conditions, but larger lenses are required during low-light conditions.