RC said:
Paul those are great shots! Thanks for sharing. Would you mind sharing your settings? I'm specifically interested in what AF mode you use when shooting in AI Servo (moving/tracking subjects).
I've been experimenting with different modes (single point expansion, zone, etc.), and have not come to any real conclusion. I do realize it depends on what you are shooting, distance, and so on.
Hi RC
I am glad that you appreciate the photos that I took and posted in this thread. THANKS!!
Sure, I don't mind sharing my settings. Just to give you a bit of background, I 'came up' through the ranks of initially using a film P&S, then some Fuji digital P&S, then a Canon 350D DSLR in 2005 and a Canon 7D about 2 years ago. With each change of camera I had, I learned more about AF and had better bodies to practice with. Particularly with the faster response of the DSLRs... and the 7D captures many 'action' photos that I couldn't have with my 350D.
What I've found to be the best settings on my 7D for a 'bird in flight' (BIF) with a (relatively) busy background is the 'AF point expansion'. I keep the selected AF point over the bird, and it tracks well using AI Servo. If the bird is large, I can even use single point AF with AI Servo.
However with the photos that I took of these rapidly and erratic moving 'Little Wattlebirds' in flight, was the Zone AF. The reason is that the birds were quite close, and with the larger area of AF points selected, I was more likely to get an active AF point to pick up the birds against the mainly clear blue sky (there were a few clouds or at times trees near / in the frame when they were flying around -but most of the time it was clear blue sky).
The birds were catching insects mid-air, and thus flying and swooping suddenly (they were perched, semi-hidden in branches - waiting till an insect (or many!) would come within certain distance - and they would go in for a meal! Taking these photos was a real challenge. I found the most successful setting for my camera was to have it on Manual (ie shutter speed of about 2500 and aperture f/5.6), with Auto ISO. (I like that even though I normally have ISO set to 1 full stop settings - ie I change between ISOs 100, 200, 400, etc - with Auto ISO it can go up and down in 1/3 EV settings!)
I was using my 70-300mm L lens which is very sharp wide open, also f/5.6 at 300mm - this was the best setting. The birds were so close that often I was not shooting them at 300mm as they were either too large to fit in the composition, OR too hard to 'find' at 300mm after they had launched in flight from the tree. (There were several birds around, perched across 2 trees which I was standing near / almost under!) So I usually had my lens at around 70mm - 100mm, hand on the zoom ring - and when a bird took off I then brought my camera to my eye quickly - and got focus on the bird, then zoomed in sufficiently (keeping AI Servo going all the time) - then 'snap snap snap' took a few photos in rapid succession. 8)
The 8 fps really helps in situations like this. Plus of course, it is basically essential to have a super fast focussing USM lens to capture these types of photos.
I hope sharing my strategy and settings is helpful to you, RC (and to others who may be reading this thread). I am happy to share my experience (as I do with my recipes!)... we're not in competition!!
Best wishes
Paul