oh yes I can imagine ;-) maybe there is anybody out there who dominates japanese, or who knows how to transform these phrases into something like english...;-) cheers, Pedro
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You say 2 whole stops of noise at high ISO?The technology of image sensors is ripe, and we should expect small improvements. Something like 1/3 stop better seems quite realistic.If Canon does not change their overall architecture, I agree...1/3rd stop at best. The A7s is an indication of what's possible, and it's more than two stops better than the 1D X at ISO 51200. If Canon improves their overall architecture, I really hope we see at least a 2-stop improvement across the board, low and high ISO.
Are you sure you were not talking about 2 stops of DR?
DR, lower noise. Same thing. We're primarily talking photon shot noise here. Assuming you have a perfect system...one that does not introduce any read noise, then more dynamic range or lower photon shot noise, there is no difference. It's the same thing, because dynamic range is the ratio between the maximum signal power and noise level. Read noise is just additive with photon shot noise, so it's the same thing in the end...lower noise, higher DR...same thing.
Keep in mind...noise is a random, undesired deviation from the proper, correct sample value. It's a range itself, +/- X, around the correct signal value. At higher signal power, that +/- X becomes less significant, so at higher ISO, increasing your maximum signal power becomes increasingly important. This has nothing to do with shadow pushing anymore...it has to do with overall signal quality. This is why pixel size becomes increasingly important at very high ISO settings, where as it is not really important at all at low ISO settings...at low ISO settings, there is (usually, assuming you expose properly) plenty of light, and it's read noise that becomes the most dominant source of noise. Bigger pixels gather more light, it's basically real-time averaging, like downsampling an image, only at the time the image is created.
At higher ISO settings, read noise drops to effectively imperceptible levels. Once your at ~3e- or lower, read noise is pretty trivial (so if you start out at 3e- at base ISO, like the D810, your doing really freaking good!) Photon shot noise completely dominates, and the weaker the signal, the more dominant noise will be. That is where the A7s pulls ahead of everything else right now for overall signal performance across all ISO settings. It has great low ISO DR (not the best, but excellent, at 12.9 stops), but it has the signal strength at high ISO to produce better images. It's got a maximum saturation (signal strength) of 323e- at ISO 51200, paired with a phenomenal read noise level of 0.7e-. In contrast, the 1D X has a max. sat. of 163e- at ISO 51200, paired with a still great, but still more DR-diminishing than the A7s, read noise level of 1.7e-. The A7s has twice the signal power and less than half the read noise. Ignoring the read noise entirely...you still have twice the signal strength, which in and of itself is a full stop improvement.
Also keep in mind, noise levels are additive. The 0.7e-/1.7e- RN levels are primarily additive with photon shot noise, and with the signal itself...so again, those read noise levels affect the whole signal, not just the shadows.
So, it doesn't matter what you call it, really. Lower noise, higher DR...same difference. It all means a better image in the end.
Can't really speak too much about modular components, but I'd love to see a video-focused cinema DSLR camera with something in the ballpark of:
• $3k - $4k price range
• Full frame sensor ~12mp
• Tilt touch screen
• 1080p 60fps (4K would be nice, but probably not going to happen)
• MPEG2/AVCHD codec options
• Clean 4:2:2 out (again, 10 bit would be nice but probably not happening at sub $4k)
• No time recording limit
• Focus peaking/zebras
• 19 point all cross type auto focus
• ISO range 100-51,200 (expandable to 50-204,800)
• Smooth ISO ramping auto-exposure like the Nikon D810
• Mic input with dedicated gain knob
• Headphone output
• Built-in WiFi
In my dreams... I know
What would you guys like to see in a DSLR cinema camera that would win you over more than the 1Dc?
$5k is my max limit for any 35mm format camera body.very wise move rick. mine is a 5D. Paid the premium 3.5k in August 2012, but I wanted to make those photographs at ISO 6400 which my trusty 30D couldn't do ;-) 3.5K to 4K max. And next time: i'll bite the bullet the year after release... As my only interest is better high ISOs. Regards, Peter
Announcement reminds me of the sensor they announced in development last year that could shoot in 0.01 lux... They had a video of firefly's shot in near pitch black.
So perhaps a new camera great in low light?
High ISO NR is not applied to RAW files, nor is ALO. Long exposure NR is applied to RAW, with that setting the camera takes a dark frame after the exposure (a 40 s exposure means a 40 s dark frame), then subtracts the dark frame before writing the RAW file. That effectively removes hot pixels, but it can actually add random noise.
I'd turn IS off to save battery power during long exposure shooting.