b*t
2 楼
有人用过aspheric lens么？差别明显么？
z*e
3 楼
w*o
4 楼
村长又在玩心理战试图麻痹我了,今天应该是翻不了盘了，
看来买Call的还是斗不过村长这个卖Call的MM
看来买Call的还是斗不过村长这个卖Call的MM
z*6
5 楼
cv35/1.7算吗？
【在 b*******t 的大作中提到】
: 有人用过aspheric lens么？差别明显么？
【在 b*******t 的大作中提到】
: 有人用过aspheric lens么？差别明显么？
c*d
6 楼
早就想到了
w*s
7 楼
if could break out here, it is still possible.
【在 w*******o 的大作中提到】
: 村长又在玩心理战试图麻痹我了,今天应该是翻不了盘了，
: 看来买Call的还是斗不过村长这个卖Call的MM
【在 w*******o 的大作中提到】
: 村长又在玩心理战试图麻痹我了,今天应该是翻不了盘了，
: 看来买Call的还是斗不过村长这个卖Call的MM
b*t
8 楼
跟类似的spherical lens比较过么？相差上差别明显么？？
【在 z****6 的大作中提到】
: cv35/1.7算吗？
【在 z****6 的大作中提到】
: cv35/1.7算吗？
g*l
9 楼
太笨了，这不上来第一招吗
w*o
10 楼
Time is not on my side.
【在 w******s 的大作中提到】
: if could break out here, it is still possible.
【在 w******s 的大作中提到】
: if could break out here, it is still possible.
b*r
11 楼
现在好点的镜头都非球面吧，特别是广角一点的非鱼眼头
d*z
12 楼
看开头就猜到结果了。小娃娃头大，头能过去的身子就能过去。
w*s
13 楼
also the break out seems failing?
【在 w*******o 的大作中提到】
: Time is not on my side.
【在 w*******o 的大作中提到】
: Time is not on my side.
C*c
14 楼
好多狗头也都是非球了
反正都是铸模的
手工研磨的非球比较牛逼
【在 b****r 的大作中提到】
: 现在好点的镜头都非球面吧，特别是广角一点的非鱼眼头
反正都是铸模的
手工研磨的非球比较牛逼
【在 b****r 的大作中提到】
: 现在好点的镜头都非球面吧，特别是广角一点的非鱼眼头
H*g
15 楼
你毕竟是带孩子教主，不能跟群众比啊
【在 d****z 的大作中提到】
: 看开头就猜到结果了。小娃娃头大，头能过去的身子就能过去。
【在 d****z 的大作中提到】
: 看开头就猜到结果了。小娃娃头大，头能过去的身子就能过去。
b*t
16 楼
这一段有点意思：
What are the advantages of the PGM aspherical lens compared with the
precision-ground aspherical lens and the hybrid lens?
Sakuma:
Since plastic is used in the hybrid lens, it is subject to environmental
changes such as temperature and humidity fluctuations. However, such changes
have a negligible affect on molded glass lenses. As for a precision-ground
lens, the process of directly grinding the glass takes time and is therefore
not suited for mass production. Since a molded glass lens is made by
pressing softened glass into a die, it is possible to make a lens in a short
time.
Sensui:
Another advantage of the PGM aspherical lens is its high refractive index.
Lenses with higher refractive indexes perform better. Since glass that
refracts well is hard and expensive, if it is ground, the grinding elements
wear out quickly, making the production of even one lens extremely expensive
. With molded glass, however, costs can be kept down, which is highly
advantageous in the area of optical design where several elements are used
in a single lens. Moreover, grinding marks appear in the bokeh areas on
precision-ground lenses. This does not happen at all with molded glass.
Nikon no longer uses the precision-ground method for making aspherical
lenses for photography.
Sakuma:
The glass molding technique used to be more expensive than the hybrid method
, but that difference has recently narrowed with small-diameter lenses.
There is no apparent cost advantage yet with molded glass, but it may happen
in the near future.
http://imaging.nikon.com/history/scenes/25/index.htm
【在 C****c 的大作中提到】
: 好多狗头也都是非球了
: 反正都是铸模的
: 手工研磨的非球比较牛逼
What are the advantages of the PGM aspherical lens compared with the
precision-ground aspherical lens and the hybrid lens?
Sakuma:
Since plastic is used in the hybrid lens, it is subject to environmental
changes such as temperature and humidity fluctuations. However, such changes
have a negligible affect on molded glass lenses. As for a precision-ground
lens, the process of directly grinding the glass takes time and is therefore
not suited for mass production. Since a molded glass lens is made by
pressing softened glass into a die, it is possible to make a lens in a short
time.
Sensui:
Another advantage of the PGM aspherical lens is its high refractive index.
Lenses with higher refractive indexes perform better. Since glass that
refracts well is hard and expensive, if it is ground, the grinding elements
wear out quickly, making the production of even one lens extremely expensive
. With molded glass, however, costs can be kept down, which is highly
advantageous in the area of optical design where several elements are used
in a single lens. Moreover, grinding marks appear in the bokeh areas on
precision-ground lenses. This does not happen at all with molded glass.
Nikon no longer uses the precision-ground method for making aspherical
lenses for photography.
Sakuma:
The glass molding technique used to be more expensive than the hybrid method
, but that difference has recently narrowed with small-diameter lenses.
There is no apparent cost advantage yet with molded glass, but it may happen
in the near future.
http://imaging.nikon.com/history/scenes/25/index.htm
【在 C****c 的大作中提到】
: 好多狗头也都是非球了
: 反正都是铸模的
: 手工研磨的非球比较牛逼
K*2
17 楼
这么弱智的方法，居然花了一分钟
b*t
18 楼
尼康做过很多aspherical lens么
changes
ground
therefore
short
【在 b*******t 的大作中提到】
: 这一段有点意思：
: What are the advantages of the PGM aspherical lens compared with the
: precision-ground aspherical lens and the hybrid lens?
: Sakuma:
: Since plastic is used in the hybrid lens, it is subject to environmental
: changes such as temperature and humidity fluctuations. However, such changes
: have a negligible affect on molded glass lenses. As for a precision-ground
: lens, the process of directly grinding the glass takes time and is therefore
: not suited for mass production. Since a molded glass lens is made by
: pressing softened glass into a die, it is possible to make a lens in a short
changes
ground
therefore
short
【在 b*******t 的大作中提到】
: 这一段有点意思：
: What are the advantages of the PGM aspherical lens compared with the
: precision-ground aspherical lens and the hybrid lens?
: Sakuma:
: Since plastic is used in the hybrid lens, it is subject to environmental
: changes such as temperature and humidity fluctuations. However, such changes
: have a negligible affect on molded glass lenses. As for a precision-ground
: lens, the process of directly grinding the glass takes time and is therefore
: not suited for mass production. Since a molded glass lens is made by
: pressing softened glass into a die, it is possible to make a lens in a short
l*t
19 楼
看标题以为又是螺栓 钢管之类。。。
d*4
20 楼
搞不好娃就是那么进去的
A*H
21 楼
LOL
神回复啊
【在 d*****4 的大作中提到】
: 搞不好娃就是那么进去的
神回复啊
【在 d*****4 的大作中提到】
: 搞不好娃就是那么进去的
H*7
22 楼
我以为是那个小弟弟
d*z
23 楼
赞回复。
【在 d*****4 的大作中提到】
: 搞不好娃就是那么进去的
【在 d*****4 的大作中提到】
: 搞不好娃就是那么进去的
g*r
24 楼
小屁孩儿居然不哭 这么镇静啊
【在 z**********e 的大作中提到】
【在 z**********e 的大作中提到】
h*e
25 楼
电影里面一般都是脱下衬衫，尿湿了，就可以绞着绞着把钢筋掰弯了吧？
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