[kt88yip]

小弟是用 D700 A=光圈先決...推到 支鏡去到 2.8
但是一路對焦.發現支鏡個光圈跳上跳落.2.8>3.5>4>5.6>3.5
請問是否正常.謝謝賜教.....

[小小生]

絶對定常

[kt88yip]

是否要無限遠至有2.8

[manpo79]

唔正常
我支sigma 150mm 對幾近都可以f/2.8
但實際係暗左

[Obi-Wan]

sigma 150mm 對幾近都可以f/2.8 <==== actually the f stop is 5.8 at the closest distance 0.38 m (1:1)

[manpo79]

唔信就算,當我錯