I STILL have not sprung for a NEX. I too am pretty "banged up." My arthritic related problems are more and more slowing me down. Just being awake hurts.
I can recommend the nex, especially if you are struggling with painful arthritis, it's so easy to use. I used longer lenses in the past for no other reason than I can handle them easier... I actually gave away small lenses because I found them too awkward to use. When mounted on a tripod and as long as I use the remote (no dangling wires), I can even use 300mm lenses.
Here's an example... yes, more tree's, it's the scene I look at all winter... I'm going to buy a onesie thermal suit to see if I can get out on my scooter to look at something different...
Both shots out a double glazed window.
28mm OM Hoya, I've nearly got the colours right & just about in focus. the centre tree is where the pigeons landed.
300mm FD Tokina... believe me, this tree is a real stretch to focus using the best of af lenses from the bottom of my garden, this shot is from inside my house (50ft+ further back).