It was on a tripod. But the tripod was set on loose dirt

It was on a tripod. But the tripod was set on loose dirt (farm field) by a country road with fairly cars passing by, so it is not very stable. If the tripod is absolutely stable, the stars should be straight lines without any jagged edges.

所有跟帖： 

• 上了架子？俺在沙滩上有海水冲击拍片子都没有这么抖啊。 -(@_@)- ♂ (16 bytes) () 11/18/2007 postreply 20:47:27

• May be because I was working in a dark cold night? -pieq314- ♀ (0 bytes) () 11/18/2007 postreply 21:13:53

• Just one thought: you are not thinking about the Earth rotation -pieq314- ♀ (206 bytes) () 11/19/2007 postreply 05:31:58

• 这是俺20美金的架子在沙漠地上长爆三十分钟拍的。 (图) -(@_@)- ♂ (132 bytes) () 11/19/2007 postreply 06:41:52

• 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) -pieq314- ♀ (368 bytes) () 11/19/2007 postreply 08:07:28

• 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

• 长曝时最好用beanbag/石块挂压脚架。 -DannyXu- ♂ (0 bytes) () 11/19/2007 postreply 09:20:47

• 你拍的和PI的片子不同。你用大广角，他用长焦，长焦 -U96- ♂ (42 bytes) () 11/19/2007 postreply 08:58:02

• 嗯，有理！ -建筑工- ♂ (0 bytes) () 11/19/2007 postreply 09:06:15