For me, I never shoot below 1/500 unless I'm on a tripod with a still subject.
Whaa? Never? Never ever? Never ever ever?
Pretty much. I know the rule about focal length and shutter speed but,
for me, I'm a swayer and I need that shutter peed. My hand holding technique is obviously not the greatest. I suppose I could get down to 1/60 if I absolutely had no choice and had something to lean on,
but for me, higher ISO gives better results. For taking pics of kids for anyone, I think 1/500 is a good speed.
Years ago, in the mid-1970's, one of my early photography mentors, a long-time, small-town commercial shooter told me, "You don't know what sharp is until you start shooting all your pictures at 1/400 or faster." Yes, he said 1/400. Old shutter speed, from a man who was old by 1970. I thought he was a bit daft when he told me that bit of advice.
Fast forward a few years. I got more and more into photography, and acquired my first Nikons, and more and more lenses. Fast forward about eight years, and I thought, "I'm gonna try his advice for a week." I had been shooting LOTS of photos, with good lenses. I had a nice lens kit, an F3HP and an FE-2 and a FM, 24,28,35,50,85,105,135,200mm primes. Eighteen pounds worth of kit. I shot all types of assignments, at whatever speeds I felt like shooting....1/30,1/60,1/125 second, lots of stuff with 100 speed Ektachrome slide film, or 400 speed Tri-X.
So..I decided to try
shooting everything at 1/500 second for a week. I'll never forget this. I get the first roll of E-6 slide film back from the processor and I am dumbfounded. EVERYTHING is SHARP as HELL. I had not realized it, but the entire world is in motion. Shots that I had shot many times at 1/125 second...were now,at 1/500, really,really,really crisp. Of course I was at wider f/stops, but no more of this f/8 at 1/125 stuff... f/4 at 1/500 second made the entire world POP! with clarity with the 24,28,35,and 50mm lenses. My tele shots with the 105mm f/2.5 were astoundingly crisp at 1/500 second. Not just crisp, but
astoundingly crisp.
I had thought that with a decade of experience, that I had nothing to fear from shooting at 1/60 and 1/125 all the time. Boy...was I wrong.
All I can say is...you don't know what SHARP is until you start shooting everything at 1/400 second or faster. Try it for a week.