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发表于 2010-10-5 20:41
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| 正好刚看到一个类似的问题在别的英文论坛:3 k) p: {. C+ J 
 % _5 `2 ~' z) c) a8 @F4 IS Vs. F2.8 non IS, 贴过来大家都评论评论。
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 6 r$ I) b4 i: D6 BAnyhow, you pose a good question - f/4 IS or f/2.8 non IS. Here are the main points:, D3 ]' {$ z# H  f) T
 
 & w/ T' @5 z( x1) The f/2.8 gives you one extra stop of hand-holding possibility, but at the cost of depth of field, whereas the 4.0 gives you 3 stops of hand-holding possibility at any aperture. Winner: f/4.
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 2) The f/2.8 gives you one extra stop of light in darkened conditions when photographing moving subjects. The f/4 doesn't. Winner: f/2.8.3 S/ r- _' y& ^% @! p0 {
 
 & i0 a/ n* P/ t' c/ A0 v3) The f/4 is lighter and smaller. Winner f/4.* }0 f+ w# L: B. E
 
 7 ]- R9 @) D6 Y8 ]. P4) The wider aperture of the f/2.8 can offer more creative possibilities, especially when taking portraits. Winner: f/2.8.
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 5) The f/2.8 has better bokeh (creaminess of the blurred areas). Winner: f/2.8.
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