I couldn't say for sure , I've had it for 9yrs and only used it from the farm house to spot ground hogs, it has never been in the field. I bought it from a friend , and he had it for 2yrs and that's all I know. I seen one on ebay and one on craigs list 2 months back both were for $1000 and over.
can the eyepiece be changed to take a lower powered one or a variable? 30x wont allow me to see anything in the heat we get around these areas in summer.