Canon Community

My apologies. I was thinking in terms of mirrorless bodies instead of DSLRs.

Sigma's lenses for Canon EF mount are reverse engineered. They're not made under license from Canon.Sigma can only make sure the lens is compatible with Canon bodies available at the time they are developing the lens. If Canon releases a newer camera...

Have you tried using the viewfinder rather than the lcd?

Your best upgrade would be to faster lenses, not to a different camera body still limited by your narrow aperture lenses.

I think the moose was sitting in much brighter light than the bird. More light to work with usually results in a better picture. Photography is always about the light. Always!