随手搜了一下。这个30f1.4问题太大了
一般镜头不管机身选的是什么光圈, 对焦的时候都是用最大光圈, 这样才能保证进光量
和对焦性能. 只有在拍照的一瞬间才缩光圈. 这个30f1.4奇葩在对焦的时候就缩光圈.
lol
S+本来弱光对焦就是弱点, 结果还缩光圈. 对焦性能能好就怪了呢.
Prime time: Sigma 30mm F1.4 DC DN
Quote: "On Sony E-mount cameras, this lens focuses stopped down at your
shooting aperture (we're not certain if it's Sony camera bodies, or the lens
, that dictates this behavior). This leads to increased chances of hunting
as you stop down your shooting aperture: for example, if you're shooting at
F5.6, you may notice the lens rack back and forth more than if were you
shooting at F1.4, especially if you're in a continuous AF mode.
Unfortunately, this behavior is becoming more commonplace as newer Sony
cameras tend to be reluctant to open the iris for AF acquisition, but we've
also noticed this 'stop-down focusing' to adversely affect some lenses more
than others. This lens, along with Sony's own FE 50mm, in particular, can be
problematic. Let us know your experiences in the comments below."