回复：这是俺20美金的架子在沙漠地上长爆三十分钟拍的。 (图)

The camera shake must be due to two reasons:

1. Cars driving by. I was only 5 feet away from passing cars, so the wind and ground vibration will affect the camera.

2. I shifted my weight.

For your 30min exposure, you can walk away so that during most of the exposure time, there is nothing near the camera (no wind, no vibration from the ground).

所有跟帖： 

• 派老哥是不是没有用release cable或remote control？ -建筑工- ♂ (0 bytes) () 11/19/2007 postreply 08:51:30

• I used self timer, and did not bother with mirror lockup. -pieq314- ♀ (108 bytes) () 11/19/2007 postreply 12:01:14