anyone fancy doing a tutorial on incar light trail shots? i tried the other night but wasnt happy with the results
basically; luck and perseverance
In car trails and any light trail shots involve a massive amount of luck or trial and error, as you've got no control over the light, e.g. your in car ones, how are you or the camera's EV metering going to be able to predict how much traffic you'll have coming toward you and how fast it's going? the same goes for light trails, you can have everything set up correctly and boom a police car moves through the scene on a blue light call and it can either ruin or makes the photo .
The only advice I'd give for trails shots, is make sure the camera is on a solid base either a quality tripod (using a remote shutter or selftimer) or on a suction clamp / rig for in car for smaller cameras you could use a gorilapod. But try and hold the camera and you'll get shake and 'head bob'. Obviously once the camera is mounted to the car, it's going to track with the suspension.
Use the lowest ISO you've got, this will help cut down the noise.
You're going to need a small aperture say 16 and up, in order to increase the shutter speed, this will give you a nice wide DoF too, using ND filters with a large aperture could give you some nice bokeh trails though.
but it's basically trial and error, hope that helps.