Just seen your reply mate, I was the same I bought the viper but couldn't get on with the screen so I sold it and got the photon rt, now in my opinion it's a great scope for the price, could be better but the price tag says it all, but for airgun range I cannot fault it, easy to use, straight forward, I'm getting 3hours off four rechargeable AA batteries that's using the built in ir which is fine, easy recognise rabbits upto 100yds plus, does what I need it for, now with an external ir even better results, but tthuhat's just my opinion.... ?