Have a look at the tasco silver antler range. A 40mm front lens is ok for daytime, 50mm is ok for dawn and dusk, also for lamping as it lets more light in. As for the zoom 3 - 9 is ideal for airguns mate. I use a 3 - 9 x 50 on my hw100 mainly for lamping, i use a hawke mildot 3-9 x 40 on the supersport carbine and a 4 x 42 on my smk xs78