[kaysintak]

各位ching，本人剛剛敗了24-70 f2.8L，想問問怎樣可以測焦準不準呢？

[JSmith]

點解唔係俾錢前試，而係俾錢後返屋企先至試？

影幾粒電芯，睇返張相既焦點是否等如你對焦時既焦點，唔好手震~

[kaysintak]

比錢前當然有試，睇過好像冇問題，想返屋企10日內再試真d ja~~
自己係屋企影過keyboard 對全其中一粒制影過，睇落都ok，咁係唔係=準焦呢？

[cclee001]

If you want to test the focus, you can try this
http://focustestchart.com/focus21.pdf

[kaysintak]

多謝ching意見!!
我會自己測試下，再上canon cs cal鏡，咁會更好o既!!

[JSmith]

吓？

[calwkf]

新買返黎就拿去cal鏡？

[Fluorite]

" 新買返黎就拿去cal鏡？"
Sure, if you feel 不準, my new 24-70 f2.8L only used one time feel 24~35mm not so sharpen, & take to CS cal, now ok la.

[王迦南]

對住把間尺影，光圈還應該盡量開大一點，便可知是否失焦了。