Lens Questions and answers

If I later find my favorite focal length or become more advanced, can Istill use these lens or I need to buy all new lens?

Also what is the difference between

1. Sigma Zoom Wide Angle 18-200mm f/3.5-6.3 and 2. Sigma Zoom DC OSbesides Optical Stabilizer? is Optical Stabilizer very important?

Thanks.

来源: pieq314


1. Yes, when you get more lenses, the Sigma 18-200mm will continue tobe useful for its convenience (small in physical size and large zoomrange). Situations you would need convenience: travel, ski slopes,hiking, etc. The new lenses you buy when you become more advanced willalso be much heavier with a lot less zoom range.

2. OS is important for telephoto end. Without OS, you may have trouble holding the camera steady at 200mm.









Drawback of 18-200mm
来源: pieq314

The reason that 18-200mm (with or without OS) is so small andinexpensive is because it has small aperture: f/3.5 at 18mm and f/6.3at 200mm. Small aperture means slow shutter speed and slow autofocusingspeed. This is also one reason for getting the "OS" version so that youcan hold the camera/lens steady at 200mm.

The small aperture may not be a major problem for using this lensduring the day. But if you try to use it to photographying indoorsports, such as basketball, you will find the shutter speed to be tooslow (and autofocusing speed is also very slow).

The wide end (18mm) has f/3.5, which is not too bad. The expensive zoomlenses (such as Canon 17-55mm f/2.8 or Sigma 18-50mm f/2.8) only haveaperture f/2.8, which is not too different from f/3.5. This means youcan use this lens (18-200mm) for taking indoor group photos duringparties, etc.



来源: -sjmj-

镜头选择是个挺复杂的事儿，像你说的，选择太多。

你先想想，准备在摄影和器材上走多远？是买1，2支物美价廉的镜头旅游和家用就会安心？还是会把摄影变成serioushobby并在器材上发点小烧不断升级追求最佳画质？如果是前者，楼上两个建议的镜头都不错。虽然我一向认为照片的好坏跟器材没关系，但是也有不少同学玩起摄影来不由自主地是走后者的路，那样的话不如一开始就一步到位买（中期内）不用升级的镜头，虽然也许开始不能把焦段凑齐（学摄影的话也没必要。先给自己归归类：）





What is your recommendation for mid-range lenses that don't need to be upgraded?

在你预算附近，you can get one of the following normal zoom lenses:
Tamrom 17-50 f2.8 $350-400：优点是性价比高，有f2.8的大光圈，适合人像和室内。
Sigma 17-70 f2.8-4.5 macro ＄350: 优点是焦段稍长, 有不错的macro功能，缺点是光圈比Tamron小一级。
Canon 17-40 f4 L $600, 优点将来能用在全幅相机上和Canon L头的reputation, 缺点是如果不配上一个长焦，焦段稍短。

这样你只要再攒银子以后败一个长焦：Canon 70-200 f4 L ($600) 或者最好是带IS的version ($1000)，就齐了。

另外看看pieq说的，也有道理, 也看你是不是出门时嫌换镜头麻烦。上面的镜头主要缺点是现在没有长焦，旅游时可能受限制，跟你自己的拍摄习惯也有关。。。复杂呵。