Several years ago I purchased a Swift Audubon 8.5x44 Mark II 804 binocular. It is in excellent condition -- I believe I only used it about 6 or 7 times over the last 17 or 18 years. Now that I am approaching retirement, I anticipate many more opportunities for birding in the near future. I have read several favorable reviews of the 820 ED Swift Audubon porro and I am wondering whether the "improvements" justify a purchase. The obvious changes of water proofing, lighter weight, and more compact size make it attractive. I have read several conflicting accounts regarding eye relief in the new version. I wear glasses and this is a concern. Unfortunately, I am not near a store that has the 820 in stock -- so I need advice about this potential problem. Second, will I notice a discernible difference in sharpness, brightness, contrast, and clarity with the 820 over the 804? Are there any color fringing (CA) problems with the 820? Thanks in advance for your thoughts and advice.
Dennis
Dennis