i have heard tale of people running them out as long as 30 sec. but during the day i would just wind up with a white photo. it all depends on light and having a good light meter. not sure on dslrs how it that works though.
People that run shutters for that long use neutral density filters. They are pretty much shaded filters to lower light contact on the sensor.
Have you thought about getting a 580ex ii yet? When I saw that picture of your car, all I could think in my head was how good it would look if you had used a faster shutter speed to darken the back and a flash to illuminate your subject. The other lights in the background would make for nice bokeh and really put a nice focus on the car. I was using a friend's setup of 5d MKii and two 580ex ii controlled by radiopoppers before I got my remote flash setup and the things you can do are amazing. Obviously not telling you to go spend $1700+ on a flash setup, but a single 580ex ii will make shots a lot more interesting than your stock camera flash.
Number one thing I love about off-camera strobes is the depth they give. I think on your camera, there is a feature that allows the on-camera flash to trigger remote strobes, so if you ever get the 580 exii it should be the only piece of kit to get you started.
Never would be able to get this without having complete control over where I wanted the lighting. Should have blacked out the window in the back, but maybe some other time.
Used the off camera strobe, triggered by ST-E2 to create shadows that would otherwise not show if I used the flash on-camera. The advanced off-camera strobes also have zoom functions for the light so that you can control the beam of light coming from the flash, allowing you to isolate small areas in your picture, or spread it through the entire frame.
How's the color fringing look wide open on the 24-70? I have the 28-70 and never got to use my friend's 24-70 before he sold it but apparently it's supposed to be better?
Edited by TheWAND, 10 August 2011 - 10:44 PM.