I use manual focus for everything. Every lens that I own for all my 35mm SLR's are manual focus (I only buy/use manual focus film cameras), the 35mm rangefinders I own are MF, as are the Medium format cameras...
This has spilled onto my DSLR and the way I use it, I now have all my lenses switched to MF. I find it so much better to shoot MF because AF can not be relied on at times, especially in low light. It doesn't matter how expensive the lens it, there is not a single one out there that can AF in low light correctly, in this case MF is a must.
Depending on what kind of photography I am doing then I may use AF. I use it quite a lot for birds in flight, but that's about it. If I was into sports photography then I guess I would also use it for that.
It is not just down to personal preference, there are many reasons why MF is better. I often encourage people to give it a try for a week or two and nobody ever says that the experiment is a disaster, many prefer it.
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