n*9
2 楼
下午想起来现在已经过了他们说的6个月的正常处理时间了,我4月6号的RD,一直以为
在TSC,结果告诉我的案子在MSC。说现在就给MSC发request,15天呢给我答复。4月以前
的大家试试做SR吧。
在TSC,结果告诉我的案子在MSC。说现在就给MSC发request,15天呢给我答复。4月以前
的大家试试做SR吧。
s*g
3 楼
以21mm为例,在f/8下,对焦无穷远,景深范围就已经cover从不到7个ft到无穷远。这
种情况下,所谓为了增加景深,把光圈缩到22有意义么?除了要表现太阳光芒这种需要
之外。
种情况下,所谓为了增加景深,把光圈缩到22有意义么?除了要表现太阳光芒这种需要
之外。
r*b
4 楼
某些分行可以,但汇率低得很
a*n
6 楼
小光圈用处很多啊
其一,
假设是全幅机,21mm
f/8下 至少对焦到183cm处,景深才能从92.2 cm到无穷远
f/22下 只用对焦到65cm处,景深就能从32.5cm到无穷远了
比如你想用21mm焦距把距离你半米的一个人和背景都拍清楚,你就得用f/16,对焦到1
米处
其二,
有时你需要一个很慢的快门速度,比如拍水什么的,当时光线又很足,你就只能把光圈
缩小
假如f/8下曝光时间只能到2秒,f/22下就能到15秒
楼下继续补充
其一,
假设是全幅机,21mm
f/8下 至少对焦到183cm处,景深才能从92.2 cm到无穷远
f/22下 只用对焦到65cm处,景深就能从32.5cm到无穷远了
比如你想用21mm焦距把距离你半米的一个人和背景都拍清楚,你就得用f/16,对焦到1
米处
其二,
有时你需要一个很慢的快门速度,比如拍水什么的,当时光线又很足,你就只能把光圈
缩小
假如f/8下曝光时间只能到2秒,f/22下就能到15秒
楼下继续补充
r*b
7 楼
某些分行可以,但汇率低得很
s*i
9 楼
DOF is relative. if you plan to blow up to a poster the DOF would be
shallower and you would need smaller aperture
shallower and you would need smaller aperture
p*o
10 楼
chase可以,亲测可行,拿着现金直接过去换
汇率低,亏好多
汇率低,亏好多
s*g
11 楼
拿21mm拍人是比较少见的情况了,一般是拍风景,所以183mm到无穷远的景深完全涵盖
了你要拍摄的内容。在这种情况下,你还需要22的光圈么?或者说开22的光圈比开8的
光圈有什么优势么?
避开拍水拍太阳这种特殊效果不谈
1
【在 a******n 的大作中提到】
: 小光圈用处很多啊
: 其一,
: 假设是全幅机,21mm
: f/8下 至少对焦到183cm处,景深才能从92.2 cm到无穷远
: f/22下 只用对焦到65cm处,景深就能从32.5cm到无穷远了
: 比如你想用21mm焦距把距离你半米的一个人和背景都拍清楚,你就得用f/16,对焦到1
: 米处
: 其二,
: 有时你需要一个很慢的快门速度,比如拍水什么的,当时光线又很足,你就只能把光圈
: 缩小
了你要拍摄的内容。在这种情况下,你还需要22的光圈么?或者说开22的光圈比开8的
光圈有什么优势么?
避开拍水拍太阳这种特殊效果不谈
1
【在 a******n 的大作中提到】
: 小光圈用处很多啊
: 其一,
: 假设是全幅机,21mm
: f/8下 至少对焦到183cm处,景深才能从92.2 cm到无穷远
: f/22下 只用对焦到65cm处,景深就能从32.5cm到无穷远了
: 比如你想用21mm焦距把距离你半米的一个人和背景都拍清楚,你就得用f/16,对焦到1
: 米处
: 其二,
: 有时你需要一个很慢的快门速度,比如拍水什么的,当时光线又很足,你就只能把光圈
: 缩小
a*n
12 楼
汇率很低很低。我记得是5.5:1把。
s*i
15 楼
even f/8 is overkill if you only print to 4x6. but if you view 100% on your
monitor you would know f/8 is not enough.
monitor you would know f/8 is not enough.
d*0
17 楼
对焦到超焦距可以最大限度增加景深。
s*i
18 楼
not at all. I'm just saying DOF is relative. it's not that you put in an
equation to get a number that's it.
how you view the final photo affects DOF. you use f/8 and on 4x6 photo
everything probably very in focus and you have no need to use f/22. but if
you want to print a 24x30 poster and hang next to your dining table you may
wish you used f/22 instead.
【在 s******g 的大作中提到】
: 你是说同样在景深内,f/22的成像要比f/8好?
:
: your
equation to get a number that's it.
how you view the final photo affects DOF. you use f/8 and on 4x6 photo
everything probably very in focus and you have no need to use f/22. but if
you want to print a 24x30 poster and hang next to your dining table you may
wish you used f/22 instead.
【在 s******g 的大作中提到】
: 你是说同样在景深内,f/22的成像要比f/8好?
:
: your
s*g
20 楼
所以你的意思是说同样是在景深内,f/22下成像解析度比f/8下要高?
may
【在 s****i 的大作中提到】
: not at all. I'm just saying DOF is relative. it's not that you put in an
: equation to get a number that's it.
: how you view the final photo affects DOF. you use f/8 and on 4x6 photo
: everything probably very in focus and you have no need to use f/22. but if
: you want to print a 24x30 poster and hang next to your dining table you may
: wish you used f/22 instead.
may
【在 s****i 的大作中提到】
: not at all. I'm just saying DOF is relative. it's not that you put in an
: equation to get a number that's it.
: how you view the final photo affects DOF. you use f/8 and on 4x6 photo
: everything probably very in focus and you have no need to use f/22. but if
: you want to print a 24x30 poster and hang next to your dining table you may
: wish you used f/22 instead.
h*g
22 楼
不用完全超焦距,到10米就可以了,再远就算在DOF里,镜头也未必有这个解析力了
s*i
23 楼
okay, it's new year's eve and I'm being extra nice today.
1. f/8 and f/22 have different DOF. they will never be the same.
2, same photo, printed 4x6 has different DOF from when printed to a
different size.
3, the DOF equations are rough guide. it really doesn't mean anything.
1. f/8 and f/22 have different DOF. they will never be the same.
2, same photo, printed 4x6 has different DOF from when printed to a
different size.
3, the DOF equations are rough guide. it really doesn't mean anything.
b*e
24 楼
看见您老的帖,我有种考古大发现的激动感。
【在 s****i 的大作中提到】
: okay, it's new year's eve and I'm being extra nice today.
: 1. f/8 and f/22 have different DOF. they will never be the same.
: 2, same photo, printed 4x6 has different DOF from when printed to a
: different size.
: 3, the DOF equations are rough guide. it really doesn't mean anything.
【在 s****i 的大作中提到】
: okay, it's new year's eve and I'm being extra nice today.
: 1. f/8 and f/22 have different DOF. they will never be the same.
: 2, same photo, printed 4x6 has different DOF from when printed to a
: different size.
: 3, the DOF equations are rough guide. it really doesn't mean anything.
a*l
26 楼
lucky day for all of us here! any other day of the year must be like hell
on earth.
【在 s****i 的大作中提到】
: okay, it's new year's eve and I'm being extra nice today.
: 1. f/8 and f/22 have different DOF. they will never be the same.
: 2, same photo, printed 4x6 has different DOF from when printed to a
: different size.
: 3, the DOF equations are rough guide. it really doesn't mean anything.
on earth.
【在 s****i 的大作中提到】
: okay, it's new year's eve and I'm being extra nice today.
: 1. f/8 and f/22 have different DOF. they will never be the same.
: 2, same photo, printed 4x6 has different DOF from when printed to a
: different size.
: 3, the DOF equations are rough guide. it really doesn't mean anything.
s*i
28 楼
it's a pity that I lost my article on DOF. so any one want to know DOF have
to read the English article at http://toothwalker.org/optics/dof.html
【在 b*****e 的大作中提到】
: 看见您老的帖,我有种考古大发现的激动感。
to read the English article at http://toothwalker.org/optics/dof.html
【在 b*****e 的大作中提到】
: 看见您老的帖,我有种考古大发现的激动感。
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