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小弟見支鏡做特價,買左黎試下,呢支係我第一支大光圈ZOOM,我用左我現有幾支鏡黎比較過,@50mm,一樣光圈,sigm個散景都唔夠其他鏡散,係唔係所有f2.8標準變焦都係咁?nikon or tamron 果支個散景會唔會靚D?

另外我部D7000用觀景窗單點自動對焦,影同一個位置,大約有1/4相係對唔準焦,不過用live view既話又好似冇咩問題,我有用腳架,又試過唔同鏡,係唔係我部D7000有問題?

新手問題,多多包含

sigma17-50mm f2.8 os@f2.8
[url=http://www.flickr.com/photos/77273313@N05/6930914139/][img]http://farm8.staticflickr.com/7192/6930914139_5a72c6f3cd_b.jpg[/img][/url]
[url=http://www.flickr.com/photos/77273313@N05/6930914139/]sigma17-50mm f2.8 os@f2.8[/url] by [url=http://www.flickr.com/people/77273313@N05/]kin_C[/url], on Flickr


nikon50mm f1.8D@f2.8
[url=http://www.flickr.com/photos/77273313@N05/6930914143/][img]http://farm8.staticflickr.com/7210/6930914143_ae22fae331_b.jpg[/img][/url]
[url=http://www.flickr.com/photos/77273313@N05/6930914143/]nikon50mm f1.8D@f2.8[/url] by [url=http://www.flickr.com/people/77273313@N05/]kin_C[/url], on Flickr

sigma17-50mm f2.8 os@f5.6
[url=http://www.flickr.com/photos/77273313@N05/6930914147/][img]http://farm8.staticflickr.com/7062/6930914147_6bb5a8bd8e_b.jpg[/img][/url]
[url=http://www.flickr.com/photos/77273313@N05/6930914147/]sigma17-50mm f2.8 os@f5.6[/url] by [url=http://www.flickr.com/people/77273313@N05/]kin_C[/url], on Flickr

nikon18-105mm@f5.6
[url=http://www.flickr.com/photos/77273313@N05/6930914153/][img]http://farm8.staticflickr.com/7065/6930914153_0b78774fc7_b.jpg[/img][/url]
[url=http://www.flickr.com/photos/77273313@N05/6930914153/]nikon18-105mm@f5.6[/url] by [url=http://www.flickr.com/people/77273313@N05/]kin_C[/url], on Flickr

[211893484]

sigma17-50mm f2.8 os@f2.8



nikon50mm f1.8D@f2.8

[211893484]

sigma17-50mm f2.8 os@f5.6



nikon18-105mm@f5.6

[鬼見愁]

師兄，原廠鏡同副廠鏡係會有D分別，唔係原廠唔會貴咁多，仲有我睇你支kit鏡D相好似有D振，唔係支鏡可能有D走焦，因為前景D葉好似仲清D，其實小弟做個測試，支kit同支50/1.8G既差距唔係好大，起碼有定焦9成功力，你試清楚D啦。

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係,部D7000 對焦成日會對唔準

[鬼見愁]

係好暗既地方就會，對焦時要半按快門多幾次會好D，不過唔只D7000，就算D700一樣有，旗艦機會好D，相位對焦唔係萬能既，無百份百準確，但較LV快，而LV就較準但慢，如果你部機係日光日白都經常唔準，上CS check下啦，睇下係機定鏡有問題。