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Peter, very nice pics - still don't know how anyone can shoot 1000 pics in a month let alone an afternoon!!
Are you saying that the AF TC effectively turns an MF lens into AF at a selected range?
how can I shoot that many in a day? simple: lots of cars, 64GB in SD cards in the bag, and each session different cars to shoot, and that went on for most of the day, with paddock photos in between. I shoot them every time they come by because you have no time to review the shots from the lap before to see if they were in the focus zone.
frame 3008 was at 9:51:56 am
frame 3045 was at 9:53.53 am one lap later when the same car came around again.
that equals one roll of film per lap - I must confess in the film days I rarely ever did that, but then it cost a lot of cash to shoot that much, so I tried to only shot cars that "mattered" - and I didn't shoot the old 6fps trigger style either - each car is one single distinctive click in the pre-focused zone - racing is just a subject that offers a lot of click opportunities
Two additional reasons - I had no time to go back on Sunday for another day to shoot what I missed, and I wanted to see if I can get my D600 to spit some more oil before my mountain trip where I can't really bring sensor cleaning stuff along. I haven't checked yet, if I got more cleaning to do, and none of the images I took show any issues, even the 14mm at f11 stuff looks clean.
I did the math and if I went back into regular racing photography, I'd wear out a D600 shutter in about two seasons, and I'd eat up a terabyte of disk every 15 or so races.
regarding the TC-16a - yes, it has some limited AF capabilities using the camera body to drive it, so on bodies that have that little screw drive to work with old AF lenses, you can use the TC to turn lenses into AF lenses. You just need to be within the range you want to work in, because it simply cannot go from infinity to minimum focus by moving the element(s?) in the TC. You need a "modded" TC or mod it yourself to have it work on modern bodies. All that needs to be done is one pin gets swapped to a different position and a wire is connected to it.
here's another TC-16a on 600mm f4.0 shot - ISO 400 f/8 on the lens, 1/640s monopod from easily 200 feet away outside the spectator fence where the golf carts drive by. I think this was done with manual focus, though
The shot below was definitely done with the TC doing the focus work - it's a lot harder to get cars in a focus zone when you're almost level with them and they drive away from you after just zipping into your viewfinder from the side. By the time you react they are usually somewhere else. The TC-16a has some trouble tracking away from you and again, you have to watch out that you are pre-focused in an area that allows the AF to do the work. with all these cars going by, I obviously get ample opportunity to track them to test my settings.
f/8.0 1/500s ISO 400 plus TC-16a, cropped a little, too, so you're looking at a 1000mm plus perspective