Upload & Sell: Off
This is very interesting to me as the lens is within the range of affordability for me, unlike a 600L. I don't shoot a lot of BIF, but I do shoot sports and wildlife when the opportunity presents itself. Is it possible that the custom function setting you describe is the root of some of the problems with the lens? I've also wondered how camera bodies can autofocus this lens, when most Canon autofocus systems are incompatible with lenses slower than f 5.6. For folks who are experiencing problems with 5dmk3 (what I shoot with), are autofocus problems related to...Show more →
many posters have said that the lens "tricks" the camera into thinking it's a 5.6min...it reports 5.6. How this works, I don't know because the limitation of the camera would be on the amount of light gathered, and you can't "trick" the sensor into thinking there is more light. yet, Tamron could/would not market a lens as autofocus unless it autofocuses. If it didn't AF on all canon bodies, it would have to be sold with that specified.
So we;ve all seen as you said great static images and also a lot of really good flying eagles, seagulls and other birds, none by me!! So I wouldn't let my exp.color your decision making. What I;m seeing is that like many other types of systems, the best performance is only as good as the weakest link. I thought getting the 70D would give me all these enhanced focusing options...and maybe it will (and already has) on faster, shorter lenses. However, maybe 19 points, 60 points , zones etc won't amount to a hill of beans shooting on this 600mm f 6.3 lens.....
I am otherwise quite pleased with the 70D. It's funny, but I went for a short hike w/the 70D + sigma 18-250 macro "walk around" lens, and got some great shots of the snowy banks along a local river and lake, then some mallards. I found a single Green Winged Teal swimming near the mallards and went home to get my super duper 150-600 to try to get a close shot. So the Green Winged Teal was no longer around, and I could'nt get the lens to focus on the mallards.....