International Photographers Association of Los Angeles 洛杉磯國際攝影家協會

我喜欢清纯的感觉,可是好想拍不锐,请大家指点.

海边拍的？

by the Lake Ontario.

What do you mean?

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肖像是个人情感的风光；
风光是天地灵动的肖像...

可能是化妆和面部表情的关系吧. 另外眼神光应该打一点. Just my 2 cents.

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存钱存钱,接过Master Ray手中的枪.

对不起，我的错别字。我说我觉得锐度不够。

That 1/160s on a 70-200mm maybe too slow, at least for me. Here is the rule of thumb:

Use the inverse (倒数) of a focal length to ensure sharpness. If you have used the 200mm end in this case, the rule suggests to use 1/320s for a sharper image.

If you had bumped up ISO to 200, it will be sharper, with 5D, I would use ISO 320 or even 400.

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肖像是个人情感的风光；
风光是天地灵动的肖像...

All right. Thanks!

宝贵的经验呀，谢谢！

Actually, 1/320s on a 200mm lens is my rule, I added x1.5 for my camera (POV x1.5 in APS size DSLR).

Well, the trick is the faster shutter, the sharper the image, if you have a reasonable DOF to keep.

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肖像是个人情感的风光；
风光是天地灵动的肖像...

Just for this case, if you like to keep 1/250s on a 200mm because of the darkness, can I try to keep this speed but with more high ISO number if then noise is acceptable? or this is different concept here, for sharpness we should do it at least 1/320s? thanks!

白雪姐，

很好的开始，多上片，这样我们给的comments就更多啦。

Master Ray给您的tip很好，焦距的倒数，安全快门速度是图片锐利的保证。记得我刚拍片时，常用到1/30s, 1/45s, 觉得端的稳就没事。现在越拍胆越小，慢于1/125s就不敢按快门了。

可以再注意下主体和背景的曝光比，高调片该也要考虑曝光。这张片子背景亮于主体，显得主题面部过暗，肤色就不通透，就失去了清纯的感觉。

very good start, continue.

There is a shutter speed over a focal length that fits your personal situation, some people can hold a 200mm on a 1/200s or even slower speed, and that's okay.

ISO noise changes from camera to camera. Try out on your machine; trying a lot of shoots in different settings help us more than shooting the same settings over and over again.

At the begining, bracket your settings, shutter, aperture, ISO, WB, DOF, and exposure...

Bracket them all, if you are not sure... until someday, your camera is the extension of your body. The day will come when you shoot on instinct, freeing your mind from the technical stuff so it can focus on more important things.

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肖像是个人情感的风光；
风光是天地灵动的肖像...

Ray,

She has IS lens, 1/60sec shouldn't be a problem.....

I can hold my 70-200/2.8L IS @ 200mm @ 1/15 sec to get sharp images...even on 1.6x crop bodies---

see the following images....