if his old ones are more than a few years old, the difference will be huge. My dad had a set of chinon (apparently very good in their day
) binoculars for years, but with the impending move, has bought some much smaller argos ones for the staggering price of 9.99
shockingly, they are way better than the huge, but old chinons, with far more magnification and a very solid feel considering the price.