Originally posted by derelict Problem is I usually like to shoot cars and that means a CPL is pretty much always on the lens. Stacking a CPL and an ND filter and trying to make sure I nailed focus is not too easy of a thing to do. I would prefer to just have the shutter make up it up for me. I honestly really do not like using filters and step up rings.
I used to freelance as a motorsports photographer back in my film days. Mostly I shot Kodachrome 64 and Fujichrome 100. Getting good shots of moving cars is tricky. To reduce the amount of out-of-focus images I'd get, whenever possible, I would prefocus on a section of the track, and then shoot the car as it rolled over that exact spot on the track. One thing you
don't want to do is to shoot at high shutter speeds. 1/250 second is just about the fastest you can get. If you shoot with a shutter speed any faster than that, you've lost the wheel blur and your car looks like it's standing still. If you're going for static shots, fast shutter speeds are fine. But if you're going for dynamic shots which illustrate the car in motion, wheel blur is essential. And if you're trying for shots where the background's nothing but soft bokeh, then really your only option is to use ND filters. Even though Kodachrome 64 was considered a slow film, when using fast lenses wide open on a sunny day, you were looking at high shutter speeds. E.g., using the Sunny f/16 Rule, where 1/60 @ f/16 is correct exposure, this translates into 1/2000 second at f/2.8.
Most of the time I was shooting at 1/125 or 1/60 and using a monopod when necessary to stabilize my gear. I found that, if shooting a fast car at these shutter speeds, as you pan while the car goes by, all the background will be blurred nicely, so the bokeh you get from a wide-open lens isn't necessary. The motion blur is a good substitute for it.