[kennethmak1993]

本身部機係600D,一直用開跟機kit鏡(18-55mm)近日有個朋友送左支TAMRON 28-200mm比我
發覺2支鏡影出黎既相分別好大,KIT鏡雖然無咁長,但用18mm or 55mm影出黎都算清
不過支28-200既,用28mm影都ok,影到遠d,1xx-200左右,d相質就開始差(唔係濛),好似有夾硬放大張相咁,唔知係支鏡有問題,定係支支長鏡影既都係咁?

如果係支鏡問題,請問係邊方面問題?
定係我部機setting既問題?我習慣用自動曝光黎影,我應該點set先靚?

仲有就係支TAMRON對焦好慢,一暗小小就好難自動對焦,但係支kit好暗都好易對到,係咪又係支鏡既分別?

本人係新手,請各位指教指教!!!


[quote]kit鏡in 18mm :

[img]https://lh5.googleusercontent.com/t_LUgEgsepChBko-N-TybWFGx1BnZ3ZJOOFs2CR9jvzQgSdtSViySC96SzmZdPs-70kC2tmkAYE[/img]
[/quote]
[quote]kit鏡in 55mm :[img]https://lh3.googleusercontent.com/YOn-hgIkS5TwCbcOoJ9ACcpVPg0SMIc8OT0gN6BoYCZrEQPLPU2mTTpMvE5H2aFuAIQ_sk1aKG0[/img][/quote]





[quote]TAMRON in 28mm :
[img]https://lh3.googleusercontent.com/S-xWxVg-pUtnPSaoHtsFsBmnWsfIh4UMvm2gwxqdOCvgLUziX0JlqLAyifWwllEaQl3HK5aeAG0[/img]
[/quote]



[quote]TAMRON in 200mm :
[img]https://lh6.googleusercontent.com/-HlZQyMHgAKu9ipB7XN_Rmrv3j7L5KdVXxp-aFYFopa77MN5UzG0t-tPrusnyhZ8P4WBi4xVEhc[/img]
[/quote]

[kennethmak1993]

kit鏡in 18mm :
https://lh5.googleusercontent.com/t_LUgEgsepChBko-N-TybWFGx1BnZ3ZJOOFs2CR9jvzQgSdtSViySC96SzmZdPs-70kC2tmkAYE




kit鏡in 55mm :
https://lh3.googleusercontent.com/YOn-hgIkS5TwCbcOoJ9ACcpVPg0SMIc8OT0gN6BoYCZrEQPLPU2mTTpMvE5H2aFuAIQ_sk1aKG0





TAMRON in 28mm :
https://lh3.googleusercontent.com/S-xWxVg-pUtnPSaoHtsFsBmnWsfIh4UMvm2gwxqdOCvgLUziX0JlqLAyifWwllEaQl3HK5aeAG0







TAMRON in 200mm :
https://lh6.googleusercontent.com/-HlZQyMHgAKu9ipB7XN_Rmrv3j7L5KdVXxp-aFYFopa77MN5UzG0t-tPrusnyhZ8P4WBi4xVEhc

[kennethmak1993]

kit鏡in 18mm :

https://lh5.googleusercontent.com/_w3plae-4SSIAi_feICNjCx7cgZc1SDKhh6fjRdT-rMRWC0fvjfxPO9QA8VKky3vgdf4NA_05Xk




kit鏡in 55mm :
https://lh3.googleusercontent.com/77TyEQLRFBL17Kbj-XlJodka9s4p49t82CZXmn_7HyRDUEw568OssM1HKGDOTU8NifEeb-v9JKM






TAMRON in 28mm :
https://lh5.googleusercontent.com/Cg4VyJKNKZ_M85HsKXGCwL71S_TK4LmnQfopzEdzkZXno6EX94BEO7sTjBHTaK-AIjteYqpPj20





TAMRON in 200mm :
https://lh5.googleusercontent.com/aLeg_MsDK8wUmX1bSg2ycClnlcQqiIqRIzuCLgVflblJVLlvVaOS0VlVGVkEbhMhlytjLj6IvP8

[tam_dominic]

We don't have permission to see the photos.

In general the 28-200mm is harder to design with good quality.
You may stop down 2 to 3 F stops to get the sweet spot of the lens.

Happy shooting !

[mahoro1046]

高倍變焦的天涯鏡, 一般都是很難做到好畫質的
廣角端還好, 望遠端畫質衰退也很正常
加上焦距長, 對安全快門要求也高了
至於暗位對焦, 一向是TAMRON弱項
就算是原廠天涯鏡, 畫質也未必有KIT 18-55好
始終是便利與畫質的取捨

要改善的話, 鏡頭可收1~2級光鏡, 盡量用安全快門或以上, 甚至多用腳架等輔助物

[cowlau]

我直覺係 200 mm 無落腳架 + 少少手震的問題。

用到 200 mm 手持的話，盡量 keep 係 1/250 快門以上試下。