|Las Vegas Blvd|
Supposedly PANSTARR was to be visible on the skyline at sunset on this pretty evening but I could not see it. so I decided to try some long exposure using a B&W ND 3.0 filter which is 10 stops. The trick to using a neutral density filter is to take an exposure reading first, say f16 and the camera says it'll shoot it at 30s, now apply your filter to the lens, then use a chart or an iphone app which helps you figure out how long to keep shutter open, my advice is try not to go over 30s because that greatly adds noise to image. ND filters can be fun to play with as they can really create unusual images, they are good fort scenes where you want to create light trails, smooth waterfalls and add blur, combining them with a flashgun can add drama.
|ND Filter Chart|
I'm not going to go into great detail about all this because its been done to death on the internets but you can google it. Its fairly simple and in some cases I do trial and error, i've been doing it for a while now, that by looking at my cameras exposure I can sort of tell how long I need to shoot for now. The chart above assumes the following. without the nd filter on, take a reading, make note of the exposure (shutter speed) look at chart, now apply your nd filter, put camera in manual mode, dial in the proper shutter speed value, connect a remote trigger if going over 30s or use self timer with exposure delay and fire away. But what I do wish to say is don't use cheap filters reason being, the glass is inferior. I now have a collection of these filters, ranging from $15 all the way up to $250 and I can assure you the B&W filters are top of the line and hence produce a much better result.
|How not to use ND Filter|