used in imager stablizer. The camera sensor is not fixed in your camera body. When your hands shake, the sensor shakes in opposite direction to counter-act your shaking hands. If your hands (in this case, your tripod) do not shake at all, your sensor is still in motion. That is why a picture taken on a tripod with image stablizer turned off will produce sharper image as compared to a picture taken with stablizer turned on.
Canon addressed the ‘feedback loop’ in later model IS lenses by introducing an algorithm to the IS detection system to automatically recognise when the lens is mounted to a tripod. When these lenses are mounted on a tripod and the shutter button is pressed halfway, the IS system kicks in and the image in the viewfinder can be seen to go through a very slow vertical shift for about one second.
If the shutter button remains depressed halfway the IS system detects the lack of motion and automatically switches into a special mode. In this mode IS detects and corrects for mirror slap and shutter movement at slow speeds, but not for ‘normal’ lens shake. There is no advantage to be gained in turning off the IS function or locking the mirror prior to exposure.
The early model lenses which do not have this automatic function and which should have IS turned off (ie lock the IS correction lens group in place) when mounted on a tripod include the following lenses:
EF28-135mm f/3.5-5.6 IS USM EF75-300mm f/4-5.6 IS USM EF100-400mm f/4.5-5.6L IS USM EF300mm f/4L IS USM
lenses you have. It also depends on purpose of photos.
I would use M mode or A mode.
Use a tripod and turn off image stablizers.
Use apature from 7 to 10.
Increase ISO slightly.
Make your windows wide open.
Good luck!
Alex
used in imager stablizer. The camera sensor is not fixed in your camera body. When your hands shake, the sensor shakes in opposite direction to counter-act your shaking hands. If your hands (in this case, your tripod) do not shake at all, your sensor is still in motion. That is why a picture taken on a tripod with image stablizer turned off will produce sharper image as compared to a picture taken with stablizer turned on.
Best regards,
Alex
http://bbs.wenxuecity.com/photography/1647714.html
老法师的说法呢，上架子后镜头的IS要关掉，否则容易产生feedback loop，使镜头的抖动更厉害。其实这个说法有些too old了。别的镜头不了解，佳能2002年以后的长焦镜头，如果检测到镜头已经上架，IS会进入一种特殊模式，只用来补偿反光板升降和快门的机震，来自三脚架的震动被自动忽略。 当然，如果你为了省电或者提高相机的聚焦速度，关掉IS还是推荐的。拍风光时，我一般是反光板预升或者live view拍摄，但IS还是保留不关，因为快门的机震也是不容忽视的。http://cpn.canon-europe.com/content/education/technical/image_stabilization_lenses.do?page=2
Canon addressed the ‘feedback loop’ in later model IS lenses by introducing an algorithm to the IS detection system to automatically recognise when the lens is mounted to a tripod. When these lenses are mounted on a tripod and the shutter button is pressed halfway, the IS system kicks in and the image in the viewfinder can be seen to go through a very slow vertical shift for about one second.
If the shutter button remains depressed halfway the IS system detects the lack of motion and automatically switches into a special mode. In this mode IS detects and corrects for mirror slap and shutter movement at slow speeds, but not for ‘normal’ lens shake. There is no advantage to be gained in turning off the IS function or locking the mirror prior to exposure.
The early model lenses which do not have this automatic function and which should have IS turned off (ie lock the IS correction lens group in place) when mounted on a tripod include the following lenses:
EF28-135mm f/3.5-5.6 IS USM EF75-300mm f/4-5.6 IS USM EF100-400mm f/4.5-5.6L IS USM EF300mm f/4L IS USM室内拍她独照和合影。我老公说室内拍照不打闪光灯照片不糊是不可能的。我还没放弃。
M Mode估计你现在摆弄不了。剩下的看你相机高感性能如何了。
如果速度太慢，就提高ISO；
如果镜头好的话，拍单人的时候适当玩点背景虚化，也就是把光圈打到最大（光圈值最小，比如F2.8), 这是用A模式下。
对相机不熟悉的话，会觉得很复杂。
再不行，加我微信吧。
if 光圈最大 > 8 (means 5.6, 4 and so on) that you can not get sharp picture.
By the way, I am Canon photographer, Canon USM lens can focus on low light (quick and sharp). Make sure you focus right. Good luck.
我有两个镜头，一个最大光圈能到1.4，这个适合近距离拍大头像。另一个最大光圈只能到4.2，适合拍合影。室内我用那个光圈设在1.4的尼康AF镜头拍，本来预想把ISO设在800，但发现设在500，光圈优先就已经能拍出清晰照片了。可能是因为我用了三脚架。室外用的是尼康DX镜头。这个镜头最大光圈只有4.2。我在室外拍，ISO调到200， 光圈在5.6, 有趣的是，发现即便速度在1/20秒，也能拍出清晰人物照。但是室外拍时快门速度不受控制。同样的ISO和光圈，快门有时很快，有时很慢。可能和我对焦的位置有关。对到我女儿脸上，速度就快，对到深色裙子上就慢。快门速度慢了，就曝光过度了。 明天上午再试验一下室外光线的拍摄。如果明天拍照时室外雨停了，我会建议大家到室外拍合影，毕竟室外光线好些。所以我记下了两套参数，室内的和室外阴天的。我明天会把单反和手机都带着，以保证万无一失。荣幸得到你这样的摄影大师的指点。我明天忙完会把我的微信号送到你QQH里。想看你女儿的毕业照。她也是今年毕业吗？
http://www.digital-photography.com/nikon-d7000-guide/top-settings/d-05-exposure-compensation-button/