[timothyych]

請問各位大佬
18-55 = ?
55-200 = ?
因小弟剛買了D50，之前用數碼機，對變焦
幾多完全唔識，請各位高人賜教小弟
請問$5680送512 ，filter ，中小型腳架合理嗎 ?

[Philippe]

18-55, 55-200已經係最好既數據,幾多倍變焦係冇用既.

[timothyych]

請問如何換算呢 ?

[wtfgary]

D50 crop factor is 1.5x

18- 55 = 27mm -82.5mm (in 135 format)
55-200= 82.5mm - 300mm (in 135 format)

[Philippe]

18-55係55/18=3.05倍
55-200係200/55=3.64倍
3.64同3.05差唔多,但係完全代表唔到廣角及遠攝能力,所以知來冇用.

[bucuhku]

最遠焦段除以最近焦段 = 相關倍數

e.g. 18-55 ---> 18/55 = 3 倍
55-200 ---> 200/55 = 3.6 倍

[wtfgary]

同意 Philippe 兄講法。

我用400mm定焦比較55-200mm的話，55-200mm的變焦一定係勁D。但係400mm就會tele過 55-200mm.

玩DLSR就要習慣 mm 的用法 : )

Happy Shooting.

[timothyych]

那麼18-200 / 18-300 就勁啦，
請問那支鏡底用呢 ?

約幾錢 ?

[Round]

那麼18-200 / 18-300 就勁啦，

Zoom factor is a relative figure, it does not help/tell you to select which lens you need. There are a number of factors governing which lens is 勁 or not. But of course, it also depends on your definition of 勁.

You can find lens price from: http://www.ygdragon.net/

[平凡的地夫]

timothyych: 其實佢地都講左好多, 我唸你應該開始有少少concept
btw, 我再充少少,你買呢部機o既時候, SLR 面世已經好多年,
一般都係以35mm 菲林感光片o既Size, 作為標準
咁即係點呢, 如果你買左一枝28-70mm o既鏡頭, 裝去一部普通的slr 度
咁o個部裝左鏡頭o既slr o既焦距正就係28-70mm的
但正如上面位人兄講過, D50 呢部機o係一部入門級o既dslr,
咁佢入面塊CDD Size 係冇一般35mm 菲林咁大,
所以會有1.5倍o既增距, 任何一枝鏡頭裝上去,
就要將鏡頭本身個實際焦距乘返1.5倍, 即係42mm-105mm
現時市面上最高倍數o既鏡頭, 躆我所知一共有四枝,
全部都係18mm-200mm
分別為km, tarmon, sigma, 同埋未正式推出o既Nikon
18-300mm o既鏡頭暫時都未有, 不過我相信有都唔會有人買
因為鏡頭倍數越高, 成像質數就越差~
玩DSLR 玩耐o既人, 最鍾意o既反而係定焦鏡頭了~
因為最靚係呢D 鏡頭~

[16570_2005]

but, we need to pay $$$$$$$$$$$$$$$$

BTW, would you like to instruct the knowledge about lens, I am interested in that field also now. Thx

[平凡的地夫]

o岩, 定焦鏡以貴見稱!
我死鬼舅父留底左一部nikon 手動機o係度,
機就壞左, 得枝50mm 1.4 叫做冇咩野大問題, 只係入左少少塵
裝落部D50度玩下全手動, 如果你對o岩焦的話, 真係好Sharp 的~
但係如果有埋AFo既50mm 1.4 出便都要成千八蚊一枝~!
其他o個D 長焦大光圈就更加唔洗問, 天價黎