I have a good pair of Leupold binoculars, which will suffice for looking at roofs. But my uncle just got a pair of Nikon monarch ATB binocs for hunting & all I can say is WOW. The depth of field focusing in the monarchs is amazing. I think a pair of those will be in my bag very soon. 
Purely a professional need of course. If you get a chance to try a pair of those - check them out.
I like my 25 power scope on trypod can see a bee on the roof at 300 yards . Cost $15.00 for scope and $5.00 for trypod.
I can not hold 8 power Binoculars steady enough.
Roy Cooke