Novak
2022-05-20T02:06:53+00:00
[img]https://img.nga.178.com/attachments/mon_202205/20/-570ynQjgm-c4mxXyZ9hT3cSzo-256.png[/img]
[quote][tid=31973157]Topic[/tid] Post by [uid=384555]falllily[/uid] (2022-05-20 10:10):
[img]https://img.nga.178.com/attachments/mon_202205/20/-570ynQjgm-c4mxXyZ9hT3cSzo-256.png[/img][/quote]8K30P和4K60P[s:a2:不明觉厉][s:a2:不明觉厉][s:a2:不明觉厉]
估计还是26999甚至更贵[img]https://img.nga.178.com/attachments/mon_201209/14/-47218_5052bc7d91913.png[/img]
我还得等它售价调整到2w2左右才能尝试入手...
所以可能还得再等一两年也说不定
感觉大部分是假的 读出速度提升一倍看似很多 其实a7r4的读出速度只有1/10秒。。。提升一倍才1/20秒，勉强跟a7m3持平。。。佳能的eos r5 读出速度是1/60秒，电子快门才勉强堪用，a7r5要是1/20，还要8k，可以收拾收拾去了。
[quote][pid=611942783,31973157,1]Reply[/pid] Post by [uid=40583341]secynight[/uid] (2022-05-20 10:43):
感觉大部分是假的 读出速度提升一倍看似很多 其实a7r4的读出速度只有1/10秒。。。提升一倍才1/20秒，勉强跟a7m3持平。。。佳能的eos r5 读出速度是1/60秒，电子快门才勉强堪用，a7......[/quote]R5读出速度不是imx251级别吗，还是说开鸡血了？
r4那个鸡血模式确实1/20s
[quote][pid=611952114,31973157,1]Reply[/pid] Post by [uid=60529877]渣渣azure[/uid] (2022-05-20 11:14):
R5读出速度不是imx251级别吗，还是说开鸡血了？
r4那个鸡血模式确实1/20s[/quote]r4开启apsc加压缩raw加高速连拍死气白咧的样子就别提了，其实只要你日常用过就知道了，r4的电子快门比r3烂不少，轻微走动都变形，r5拍拍小汽车都问题不大。
r3的251全像素读出是1/13 是76毫秒 r5的cmos 是14.x毫秒 dpr有人算过，并且有两个人都得出了同样的结论，原文如下：
Hoka Key
Various corrections are now included in this version improved to fix various small errors.
I observe the entire image from Hoka Key's flourescent bull was 357 cycles but when I cropped the image down to one cycle it was 204 pixels high.
I then noted that for 60hz flourescent lights you get two peaks per cycle one on the positive and one the negative excursion of the AC waveform in a 16.6msec period of time.
So the math I calculation I made was 357/204 X 1/(60*2) = 1.72 *.0083 seconds=14.3 msec which is close to the same as the calculations of people using the first picture. This extremely good if it bears out as the A9, "king of fast FF sensor readouts" is around 7 ms and the 1DXIII is said to be around 16ms. I make not guarentees as this is the first time I have this an estimate for rolling shutter and I am assuming in my simple formula as simplication that your exposure time is 1/4000 which is essential is neglible in comparison to the sensor readout time. The EXIF file of the download picture shows:
Canon EOS R5
F4
1/4000 sec exposure time
ISO 51200
Focal length: 105mm
metering mode: spot
Flash mode: no flash
(I credit sybersitizen
for showing me this A9 reference: The A9 has been estimated at less than 7ms (1/150s):
据称这就是索尼A7R5(ILCE-7RM5)的规格：
新开发的6100万像素传感器，读出速度是A7R4的两倍
未压缩RAW或无损压缩RAW连拍为10张/秒
BIONZ XR处理器
支持像素偏移多帧合成
944万点电子取景器
236万点3英寸触控屏幕
8K30P(9.6K超采)/4K60P(全幅和S35均为超采)
FHD120P
S-Cinetone、S-Log、HLG
4: 2: 2 10bit Long GOP / All-Intra
MPEG-H HEVC / H.265
#photorumors
蜂鸟这掐头去尾的转载也太没品了吧
Reply to [pid=611959761,31973157,1]Reply[/pid] Post by [uid=23263692]愛情上甘嶺[/uid] (2022-05-20 11:40) 虽然但是 蜂鸟第一句是 据photorumors的报道称
根据微博某显示和成像半导体爱好者的说法，A7R4只发挥了IMX451这块CMOS大约40%的功力。
[img]https://img.nga.178.com/attachments/mon_202205/20/-570ynQ8ne8-il55ZfT3cSv4-ia.jpg[/img]
贵索的刀法领略一下你就知道，A7R5目前根本没有出的必要。
而且这种入魔我每个月都能看到一篇，月经流量贴求求你们别水了。
[quote][pid=611961643,31973157,1]Reply[/pid] Post by [uid=62678048]fishming020[/uid] (2022-05-20 11:47):
虽然但是 蜂鸟第一句是 据photorumors的报道称[/quote]我的锅 没细看[s:ac:擦汗]
Reply to [pid=611942783,31973157,1]Reply[/pid] Post by [uid=40583341]secynight[/uid] (2022-05-20 10:43)请问这个读出速度会影响机械快门嘛？手持R5想换R4中
[quote][pid=611978052,31973157,1]Reply[/pid] Post by [uid=62307655]wsycill[/uid] (2022-05-20 12:51):
请问这个读出速度会影响机械快门嘛？手持R5想换R4中[/quote]读出速度对机械快门没啥影响 r5换r4主要是整个机器的反应速度 连拍体验 对焦体验都会下降一截 不建议换
[quote][pid=611959493,31973157,1]Reply[/pid] Post by [uid=40583341]secynight[/uid] (2022-05-20 11:39):
r4开启apsc加压缩raw加高速连拍死气白咧的样子就别提了，其实只要你日常用过就知道了，r4的电子快门比r3烂不少，轻微走动都变形，r5拍拍小汽车都问题不大。
r3的251全像素......[/quote]r3的鸡血模式是1/26s的14bit下全像素读出，静音快门时是1/40s，比r4强
但是EOS R5在14bit下是1/30s，和r3半斤八两，除非你掉bit
[quote][pid=612010374,31973157,1]Reply[/pid] Post by [uid=60529877]渣渣azure[/uid] (2022-05-20 15:15):
r3的鸡血模式是1/26s的14bit下全像素读出，静音快门时是1/40s，比r4强
但是EOS R5在14bit下是1/30s，和r3半斤八两，除非你掉bit[/quote]鸡血模式等于apsc加上连拍加上压缩raw 缺一不可 所以你说14bit全像素就根本不可能 因为r3掉bit的情况之一就是连拍+压缩raw
r5在全像素模式下读出是1/60以上 不用叠buff dpr上面有人算过 原文在上面 而且在a1评测中也写过 a1的读出是1/240是r5的4倍 所以r5是1/60没毛病 以上所说的相机我都有 r3静音快门应付一般的小幅度走动还可以 叠满buff勉强应付小跑 r5日常拍摄只要不是拍螺旋桨那么激烈的基本都可以用电子快门 所以理论和实践相结合r5读出不可能是1/30这么低 应该跟r6那块cmos读出相仿 r6那块是16.几