Pros:
- Sharp
- Nice construction
- Effective VR/OIS
- Fast and accurate AF with good tracking. I've used it for a mix of birds, bugs, and youth sports. It's never failed to disappoint
- It's not white and collapses somewhat small for a longish FF lens. I like to believe the lens didn't stand out that badly when I use it to shoot youth sports. At least I had multiple parents tell me they appreciated the photos. The hood adds a decent amount of visual mass and it's probably not needed 95% of the time
- Decent pseudo macro, but only at the wide end (1:3.1 aka 0.32x)
- 500mm is 25% more reach than 400mm and is enough for my needs. I'm on e-mount and this lens combo is faster than Sony's 100-400 with a teleconverter
- Good price to performance ratio
- The lens has a focal length lock that uses a clutch like mechanism to lock the lens at any focal length. It seems a bit gimmicky, but I find it useful
- My copy appears fairly well centered, so yay
Cons:
- Stiff zoom action and somewhat front heavy when fully zoomed. There's no manual focusing this lens when it's fully zoomed unless you're using a monopod or tripod
- It's a bit heavy, but is on par for this focal length on a FF lens. If you only need 400mm, get a 400mm lens to save some heft. I use this lens exclusively hand held, but I'm also reasonably fit. I have sat on the ground and used a knee as a makeshift monopod at times though
- Somewhat slow aperture, but this also on par for the focal length. I only use this lens outdoors, so it's never been an issue. As far as consumer lenses go, there's not much faster out there at this focal length
- If you need a long lens you're going to need something longer than 500mm. There's obviously more reach here than a 400mm lens, but it's not that much more. This isn't a real con about this lens, just know what focal length you need and go from there
- No teleconverters on e-mount
Bottom line:
- If this focal length is your jam, this could be your lens
- If you don't need the reach, get something lighter and more compact
- If you don't mind walking around with a massive lens and you're on e-mount, Sony's 200-600 zoom action is really hard to beat
Haha, tell me why I'm on e-mount without telling me why I'm on e-mount. Canon and Sony seem to be on par for easy AF, but the back catalog of lenses on e-mount is hard to beat.
Hopefully Canon continues to let more third part glass use their mount.
Tamron used to make EF-mount lenses, I remember I tried one around 2010, then bought a Sigma instead.
Canon kept their RF mount locked down, but has been opening it up a tiny bit recently. This is a fairly new lens, so it's probably been optimized for mirrorless. If that is the case, it won't be compatible with DSLR bodies due to flang distances. You can push a DSLR optimized lens out further to mount on a MILC body. You can't move a MILC optimized lens closer to a DSLR body.