w********2 发帖数: 16371 | 1 iphone5在camera 上还是进步一些:
1. faster capture of photos.
2. better noise reduction
3. better low light.
4. panorama mode.
5. 加了个crystal cover
6. A6 smart filter
7. better video performance: video stablization
8. facial recognition
比较重要的是better low light,不知道能好多少,没有sample 看,如果和lumia 920
比不知道是否能比的过。 |
p*********e 发帖数: 32207 | 2 等拿到了试试看就知道喽
正好手边4,4s都在,到时候可以side by side对比下
920
【在 w********2 的大作中提到】 : iphone5在camera 上还是进步一些: : 1. faster capture of photos. : 2. better noise reduction : 3. better low light. : 4. panorama mode. : 5. 加了个crystal cover : 6. A6 smart filter : 7. better video performance: video stablization : 8. facial recognition : 比较重要的是better low light,不知道能好多少,没有sample 看,如果和lumia 920
|
l***k 发帖数: 1153 | 3 估计很难赢lumia。lumia据称是用光学防抖
920
【在 w********2 的大作中提到】 : iphone5在camera 上还是进步一些: : 1. faster capture of photos. : 2. better noise reduction : 3. better low light. : 4. panorama mode. : 5. 加了个crystal cover : 6. A6 smart filter : 7. better video performance: video stablization : 8. facial recognition : 比较重要的是better low light,不知道能好多少,没有sample 看,如果和lumia 920
|
z***e 发帖数: 5393 | 4 小相机上防抖毫无意义,连半档都降不下去。
low light主要就是针对noise和iso,也许iphone 5的iso要高些?
【在 l***k 的大作中提到】 : 估计很难赢lumia。lumia据称是用光学防抖 : : 920
|
l***k 发帖数: 1153 | 5 为什么没意义? 在sensor和光圈一定的情况下,延长曝光时间可以增强采光,但延长曝
光时间没有防抖就悲剧了,这就是为什么拍夜景最好用三脚架
【在 z***e 的大作中提到】 : 小相机上防抖毫无意义,连半档都降不下去。 : low light主要就是针对noise和iso,也许iphone 5的iso要高些?
|
l*m 发帖数: 824 | 6 You should understand the relationship between exposure time and focal
length. For shorter focal length, the safe exposure time (for minimize the
hand motion blur) is longer. A common rule of thumb for estimating how fast
the exposure needs to be for a given focal length is the one over focal
length rule, but that is for full frame camera or 35mm format sensor.
For cell phone camera, the sensor is much smaller. For iphone4s/5, it is
about 3.4mm x 4.6mm. The crop factor should be 7.8 (36mm/4.6mm). For typical
cell phone camera, the focal length is around 2mm to 3mm, that say 2.5mm.
Because iPhone is pushing the thickness of the camera, I guess it should be
more close to the 2mm. But 2.5mm is a reasonable guess. So the equivalent
focal length (to 35mm format/full frame camera) is around 20mm (7.8*2.5)
focal length. Yes, it is a wide angle lens. Based on the one over focal
length rule, the safe exposure time should be 1/20 s.
For current image processing ISP, the frame rate will be dropped to as low
as 15 frame per second for low light. The possible longest exp time is 1/15s
. It is actually longer than the 1/20s (the safe exposure time), but it is
close.
The one over focal length rule, I think it is for professional
photographer. The people like us, usually need shorter than 1/20s exposure
time to capture a non-blurred image. But for cell phone cameras, the anti-
shaking function is not that useful as it works in longer lenses.
【在 l***k 的大作中提到】 : 为什么没意义? 在sensor和光圈一定的情况下,延长曝光时间可以增强采光,但延长曝 : 光时间没有防抖就悲剧了,这就是为什么拍夜景最好用三脚架
|
z***e 发帖数: 5393 | 7 都用三脚架了还放什么抖。。。防抖都是在说手持情况。
【在 l***k 的大作中提到】 : 为什么没意义? 在sensor和光圈一定的情况下,延长曝光时间可以增强采光,但延长曝 : 光时间没有防抖就悲剧了,这就是为什么拍夜景最好用三脚架
|
d**********I 发帖数: 2057 | 8 他的意思是防抖跟脚架的目的都是一样的,就是延长曝光时间。
【在 z***e 的大作中提到】 : 都用三脚架了还放什么抖。。。防抖都是在说手持情况。
|
a****a 发帖数: 3905 | 9 光学和sensor 的性能就这样了。不会有显著的差别。按发布会的说法,就是算法上做
了改进,也就是改进了数字防抖。
920
【在 w********2 的大作中提到】 : iphone5在camera 上还是进步一些: : 1. faster capture of photos. : 2. better noise reduction : 3. better low light. : 4. panorama mode. : 5. 加了个crystal cover : 6. A6 smart filter : 7. better video performance: video stablization : 8. facial recognition : 比较重要的是better low light,不知道能好多少,没有sample 看,如果和lumia 920
|