I am interested in buying a Pulsar Digisight N550 Digital Night Vision Rifle Scope. The majority of the reviews that I have read about this night vision scope are good but I have yet to hear about how well the N550 night scope works in the cold. I would like to hear from anyone that has the N550 and has used it in the cold. I would like to know at what temperature that the N550 stops working or does the N550 remain operational below zero temperatures. The specs list the operating temperature range from 14 to 95 degrees F.