y***n 发帖数: 2318 | 1 【 以下文字转载自 PhotoForum 讨论区 】
发信人: yeson (快乐着并幸福着...), 信区: PhotoForum
标 题: "Technical" Question on Taking Firework Photo
发信站: BBS 未名空间站 (Wed Jul 30 22:46:30 2008)
Hello Everyone,
I use a Canon PowerShot S3 to take firework photos. If I set the exposure
time to 4 second (or even 8 sec sometime), after the shutter closes, it
almost takes another 4 ~ 8 sec for the camera to save / flush the image onto
the card, which means I cannot take new ones during this blackout window. I
use a PowerShot G6 as we |
q**u 发帖数: 12289 | 2 好像没听说过哪个DSLR有这问题。
onto
I
【在 y***n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 【 以下文字转载自 PhotoForum 讨论区 】 : 发信人: yeson (快乐着并幸福着...), 信区: PhotoForum : 标 题: "Technical" Question on Taking Firework Photo : 发信站: BBS 未名空间站 (Wed Jul 30 22:46:30 2008) : Hello Everyone, : I use a Canon PowerShot S3 to take firework photos. If I set the exposure : time to 4 second (or even 8 sec sometime), after the shutter closes, it : almost takes another 4 ~ 8 sec for the camera to save / flush the image onto : the card, which means I cannot take new ones during this blackout window. I : use a PowerShot G6 as we
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n******I 发帖数: 628 | 3 这是很常见的降噪技术
长时间黑暗条件下曝光会带来很多热噪点
为了去除这些噪点
有些相机会关闭shutter对着黑暗曝光相同的时间
两幅图像做一些类似相减的处理就把一些噪点去除了
很正常
onto
I
【在 y***n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 【 以下文字转载自 PhotoForum 讨论区 】 : 发信人: yeson (快乐着并幸福着...), 信区: PhotoForum : 标 题: "Technical" Question on Taking Firework Photo : 发信站: BBS 未名空间站 (Wed Jul 30 22:46:30 2008) : Hello Everyone, : I use a Canon PowerShot S3 to take firework photos. If I set the exposure : time to 4 second (or even 8 sec sometime), after the shutter closes, it : almost takes another 4 ~ 8 sec for the camera to save / flush the image onto : the card, which means I cannot take new ones during this blackout window. I : use a PowerShot G6 as we
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q**u 发帖数: 12289 | 4 good
【在 n******I 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 这是很常见的降噪技术 : 长时间黑暗条件下曝光会带来很多热噪点 : 为了去除这些噪点 : 有些相机会关闭shutter对着黑暗曝光相同的时间 : 两幅图像做一些类似相减的处理就把一些噪点去除了 : 很正常 : : onto : I
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y***p 发帖数: 1604 | |
y***n 发帖数: 2318 | 6 Thanks for the info! So I guess a DSLR with high-ISO capability needs less
noise reduction, thus has short, if not immediate turnover time?
【在 n******I 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 这是很常见的降噪技术 : 长时间黑暗条件下曝光会带来很多热噪点 : 为了去除这些噪点 : 有些相机会关闭shutter对着黑暗曝光相同的时间 : 两幅图像做一些类似相减的处理就把一些噪点去除了 : 很正常 : : onto : I
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y******2 发帖数: 326 | 7 Check the SD or whatever media you are saving the pictures on. If you use
the cheap ones, their writing speed is too slow. Get one that's 10MB/sec or
above. |
n******I 发帖数: 628 | 8 ISO越高噪点越多……
尽量用低ISO拍东西,除非现有条件下光圈和快门不够用再升高ISO
这个turnover time是啥?我英语比较菜,不好意思 /..\
【在 y***n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : Thanks for the info! So I guess a DSLR with high-ISO capability needs less : noise reduction, thus has short, if not immediate turnover time?
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y***n 发帖数: 2318 | 9 This doesn't make sense, the photo size is not big at all, cannot image the
write process take that long. I think the post about noise reduction tells
the real reason.
or
【在 y******2 的大作中提到】![](/moin_static193/solenoid/img/up.png) : Check the SD or whatever media you are saving the pictures on. If you use : the cheap ones, their writing speed is too slow. Get one that's 10MB/sec or : above.
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