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EOS Bodies / Re: A Bit of EOS 70D Info [CR1-CR2]
« on: April 15, 2013, 08:11:18 PM »
Just because it's 18 doesn't mean it is the same sensor... This would seem like a worthy successor to the 60D
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As a disabled person who can now only use his left handI knew there would be one person who had the disability that would say this... I am sorry to hear. There is a way you can try (if you havnt tried already) use one of the cameras that has a flip screen, and use a batter grip. You can use the camera upside down. Better than nothing
who was amazed at this wonderful left-handed incarnation of his current camera
who has told his friends and family what a marvellous thing this was
I can say that I am not remotely amused by this April Fool
It would have been REALLY useful to me

I crank the ISO up and still can't get the keeper rate as high at 1/1600 and higher using f4 compared f2.8. 2.8 always wins when both have IS and the ISO is similar stops. Maybe it's more a focusing issue. I certainly came to know the intricacies of the 7D while I had it and used to kind of irritate the BIF guys with the bigger F4 lenses at times when shooting side by side, especially in the golden hour.
That's the point. Sensor size does not affect exposure. Shooting at 1/1600 s, f/2.8, ISO 3200 on APS-C, if you switch to f/4 and keep 1/1600 s and ISO 3200, you'll have half as much light per unit area hitting the sensor. Same would be true with the teeny sensor on my PowerShot S100.
What sensor size does affect is the amount of noise at a given ISO. So compared to 1/1600 s, f/2.8, ISO 3200 on the 7D, you could shoot the FF camera at 1/1600 s, f/4, ISO 6400 and have lower image noise (better IQ) or you could shoot at 1/3200 s, f/4, ISO 12800 and have similar IQ to the 7D shot at f/2.8, ISO 3200 - i.e., a faster shutter speed with the slower lens and equivalent IQ.
Here's a shot with one of one of those 'bigger f/4 lenses' at dusk on an overcast day, FF camera and ISO 6400. Same shot on a 7D would be unusably noisy (and in this case, f/2.8 isn't an option...).
EOS 1D X, EF 600mm f/4L IS II USM, 1/250 s, f/4, ISO 6400
Wow, great photo! It's amazing that is ISO 6400...that setting is completely unusable on the 7D, even in relatively good light. I was just replying to someone the other day who proclaimed that the notion that small pixels increase noise is a "myth"...I'd love them to see this photo. It kind of proves my point...higher noise with smaller pixels is most certainly not a myth....there just isn't enough light per pixel to compare to something like the 1D X (assuming similar framing, anyway...although even with a center crop on the 1D X and a full frame with the 7D, downsampling won't completely mitigate the higher noise of the 7D's smaller pixels.)
I would actually be curious to know if you pushed ISO even higher, 12800, whether that would saturate the sensor more, and with a little post-process pullback, might actually result in less visible noise...





