If you are serious in getting a high qulity night vison or thermal vision this is the company I would suggest you contact:
http://www.gsci1.com/policy.htm
I have had the chance to compare side by side with the yukon brand “toys”.
Very big difference.
First of all you should check out the different ways night vision works, there are several different methods which are commonly separated by terms of generation 1 gen’ 2 gen 3 gen 4 etc’ and even within the generations there are different sub classes.
Any ways.
To try and simplify things, the gen’ 1 is extremely basic you would need allot of starlight to see and the picture would probably be very fussy still. Where gen 5 doesn’t even need any starlight at all if I remember correct and the image is extremely sharp.
If you want something even more there is a fusion of thermal vision combined or not combined with night vision which is a whole new ball game.
Bottom line is.. I would defiantly recommend shooting off an email to these guys , they were very helpful in explaining and simplifying things to me and help me make a discussion on which gen of optics to go with .
they mostley do projects for law enforcement or millitary but they were kind enough to help me out as well.
they are located in Ontario to top it off which resolves any problems with shipping across boarders.
I purchased a monocular from them which helps me walk around before sunrise to get to my spot without having to use a flashlight and make any noise stumbling over trees and such.
hope this helps.
good luck