t*i
2 楼
assuming you mean "tele extender" for "extender" and "close-up filter" for "
close-up lens".
Tele extender has optics, it sits between body & lens, enables longer reach
for tele-photo. Close-up filter and extension tube are for macro, close-up
filter sits in front of lens. Extension tube has no optics and sits between
body & lens, enables to focus closer.
close-up lens".
Tele extender has optics, it sits between body & lens, enables longer reach
for tele-photo. Close-up filter and extension tube are for macro, close-up
filter sits in front of lens. Extension tube has no optics and sits between
body & lens, enables to focus closer.
n*f
3 楼
extender跟后两个不是一个功能
close-up其实就是个加个放大镜在镜头前面,放大效果比较明显,会影响像质,有畸变
extension tube就是把屏幕往远处推,就像投影仪一样,你离屏幕远点,成像就大点,
好处是没有玻璃,对像质没大影响,放大率增长有限,远处物体无法对焦
"
reach
between
【在 t**i 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: assuming you mean "tele extender" for "extender" and "close-up filter" for "
: close-up lens".
: Tele extender has optics, it sits between body & lens, enables longer reach
: for tele-photo. Close-up filter and extension tube are for macro, close-up
: filter sits in front of lens. Extension tube has no optics and sits between
: body & lens, enables to focus closer.
close-up其实就是个加个放大镜在镜头前面,放大效果比较明显,会影响像质,有畸变
extension tube就是把屏幕往远处推,就像投影仪一样,你离屏幕远点,成像就大点,
好处是没有玻璃,对像质没大影响,放大率增长有限,远处物体无法对焦
"
reach
between
【在 t**i 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: assuming you mean "tele extender" for "extender" and "close-up filter" for "
: close-up lens".
: Tele extender has optics, it sits between body & lens, enables longer reach
: for tele-photo. Close-up filter and extension tube are for macro, close-up
: filter sits in front of lens. Extension tube has no optics and sits between
: body & lens, enables to focus closer.
k*t
6 楼
提高放大率, 途径有两: 1. 增大镜头焦距(FL) 2. 缩短最小对焦距离(MFD)
CONVERTER 是MFD 不变, 增大FL.
TUBE 是FL 不变, 减小MFD, 用在短焦镜头上效果更明显.
CLOSE UP 稍复杂, 减小了FL, 缩短了MFD, 但缩短MFD占优势总的还是增大放大率. 用
在长焦镜头上更明显.
CONVERTER 是MFD 不变, 增大FL.
TUBE 是FL 不变, 减小MFD, 用在短焦镜头上效果更明显.
CLOSE UP 稍复杂, 减小了FL, 缩短了MFD, 但缩短MFD占优势总的还是增大放大率. 用
在长焦镜头上更明显.
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