I'm trying to do long exposure photos with car headlight trails and am finding the results a little disappointing due to the low 'impact' of the light trails. I believe there are a few things affecting this, namely
- length of exposure (currently limited to about 90s at min ISO and aperture)
- the amount of traffic
- the level of light given off by street lamps
I believe 1 & 2 can be fixed by the addition of an ND filter and choosing a busier time to take the pictures, but am not sure how I can address 3. Is there some sort of filter I can use which will minimise the effect of the street lamps without cutting out too much of the light from car headlamps/tail lamps?
Here's an example of what I've done so far: