I am going to be retiring at the end of September and rather than getting another telescope (have 8 already) I decided since I will now have time to get out and shoot, to add another lens to the stable. Also my middle son, who gets my gear passed down to him, has been using my 55-250 STM IS lens for hiking since it is so light.
Do I need another lens? NO, but I do WANT another lens.
What I currently have is a Canon 80D with 18-135 STM IS, 55-250 STM IS (monopolised by by son), 100 IS Macro, 50mm Macro, 100-400 IS L (again son has), 10-22 (son has)
I was thinking of giving the 55-250 to my son for his birthday - especially since I haven't seen it in about a year.
I was looking at
Canon 28-300 L but it is heavy and at 65 I am not in the best of health and have arthritis and don't like carrying really heavy things. $2450
Canon 70-300 IS II USM $450
Canon 70-300 IS USM $1350
Tamron 28-300 $600
or get another Canon 55-250 STM IS and a Canon 10-18 for the son and get the 10-22 back.
If I am walking (hobbling) around the 100-400 is almost too heavy to carry. I am not really sure what to add to the stable.
Thoughts?

If you want something with more reach, then the Tamron 100-400mm already mentioned may be a good choice, as it's lighter than the 100-400L. If you want to throw practicality and cost out the window, then the 100-400L II would be the ultimate telephoto zoom choice. This is my wildlife lens, and it's a wonderful piece of glass. It's my biggest and heaviest lens, but the results make it worth carrying around. I do have a 70-200L f/4 IS and EF-M 55-200mm (for my M50) for those times I want to carry around a lighter telephoto.

