skibum5
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 p.4 #11 · Limited evidence mystery camera (5DX) is 30MP+ | |
Pixel Perfect wrote:
skibum5 wrote:
Pixel Perfect wrote:
David Baldwin wrote:
The flagship only uses 18 mpx because that allows the necessary fps for sport. otherwise there is absolutley nothing interesting or sacred about 18 mpx. FPS is irrelevant to the 5D series. The 5D is not a sports camera. Landscapers and studio photographers on average, would prefer 28 mpx to 18 mpx, and thats the direction the 5D3 will go in.
The flagship only uses 18MP because this camera only had one goal in life and that is to dethrone Nikon D3s. 18MP would have been the highest resolution they could use with noise still better than D3s at pixel level. I think it has little to do with fps as they are approaching mechanical limits of what's possible with moving mirror. So even if it were 12MP 14fps RAW would still be about the physical limit anyway. I'll bet they tried the 21MP sensor and found they could not get noise where they wanted, but could still do 12fps with dual digic V. 18MP is their sweet spot compromise on noise, resolution, file size and speed.
I bet the PJ simply said we don't want to deal with >18MP files and we'd actually prefer less although we do like reach and FF has less reach so I guess 18MP is ok.
Possibly they had trouble doing non-skipped video at higher MP too (atlhough I hope not, since what would that mean for 5D3 if it has more MP, maybe it could use slide out video AA filer like I think the D800 will ).
Maybe reading more than 18MP at 12fps meant super fast ADCs and all and they had poor quality so while the higher MP could be fine at lower fps it impacted IQ at higher fps.
Or maybe reading 30MP at 12fps makes to much heat build up, there were rumors they were having bad issues with too much heat from new sensors and super fast reads/video reads.
What's so special about 18MP? Why not 16 or 17 or 19? I doubt the PJ's would care less about another 1-3MP. I doubt we would have seen IOS 204K offered with more pixels - not that anybody would give a damn IMO - and 18MP is the best compromise between resolution, speed and noise with file size a minor consideration.
They probabyl wanted to seem like they were making up for a trace of the 16MP APS-H loss and thus wanted more than 16MP but even 18MP of 7D was getting complaints for size so maybe they figured to dare not go above it just yet. And the SNR difference between high ISO for 18MP vs. 21.2 or 24MP or whatnot has got to be small, are you going to notice 1/6th, if even, stop SNR difference at middle gray?
Anyway who knows, but I have doubts as to whether fine tuning the SNR to the 1/8th or 1/6th or even 1/4th stop really matter much which makes me think it must be for some sort of other reason, but no I do not know for sure.
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