I have begun training my 4 year old CLM for field trial tests. I am having trouble at 250+ yard blinds judging the depth relation of my dog to the blind. My dad passed on to me a really nice pair of 10x40 binoculars (think they were originally 800-900 bucks) he used for birding. I have researched the forum about field of vision. Will I see a big difference dropping down to a 7 or 8 power (first number) binocular? In training with these binoculars my dog is way too fast and my hands seem way to shaky to watch him run the blind thru the binoculars. Would love some input.