millerliu wrote:
剛上手, 提供若干數據給大家:
快多拍一些分享吧
millerliu wrote:
若也要一鏡走天下, 只要標準焦段, 其實 Sigma 17-70mm F2.8-4 DC MACRO OS HSM 即可,
sigma17-70定位就有點尷尬了
上有sigma17-50/2.8,下有sigma18-200C
三隻定價&畫質耐人尋味
PMMA wrote:
sigma17-70定位就有點尷尬了
上有sigma17-50/2.8,下有sigma18-200C..(恕刪)
有什麼尷尬的, 17-50/F2.8是大光圈鏡, 但是微距僅有0.2x, 而17-70/F2.8-4 macro 光圈僅小一些, 但是微距卻是0.36x , 自己重視那一樣自己要清楚.
而且18-200雖然遠近一次搞定, 但是光圈就是小, 微距要在200mm才有0.33x, 而17-70 光圈大多了, 微距只要在70mm就有0.36x , 有這麼難嗎? 三支根本完全不同, 除非購買者自己都不清楚自己攝影需求才會有採購困難.
畫質問題就請自己看了, 每個人挑剔程度不同.
不專業照片分享, 鏡頭蓋及遮光罩品質真的很好, 鏡頭握感很紮實, 但是阻尼不小, 變焦時吃力一些, 但是不會有滑出垂頭的問題, 因此Lock根本不用動, 與D80對焦速度很快, 單點對焦一下就捉住細小的樹枝. BTW, 此鏡沒有全時手動對焦功能, 因此AF只能自動對焦, 想手動對焦就要轉MF, 不可以在AF時動手轉前面的對焦圈.
結語:
Despite its optical issues, we're giving the Sigma 18-200mm F3.5-6.3 DC Macro OS HSM a four-star rating. Any long zoom SLR lens is going to come with some compromises in pure optical quality in order to achieve a manageable size and price tag. The Sigma lens is not without them, but it's reasonably sharp throughout most of its range, and improves when stopped down. Distortion can be a nuisance, but it's one that can be corrected via software, and it's tough to argue with the compact design, close focus capability, and very reasonable $400 price tag. You won't have to deal with as many compromises if you opt for a lens with a shorter zoom range—we've reviewed 18-135mm lenses from Canon, Pentax, and Sony, as well as the Nikon 18-105mm. None of the 18-135mm designs are as compact, or inexpensive, as the Sigma 18-200mm, but are solid options if you prefer to trade some zoom range, size, and money for a lens with fewer compromises.
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