« on: September 11, 2014, 09:56:26 AM »
Looks very promising for good light situations where I want more pixels on target. Coin toss whether I get one (based on asking price).
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Wow! Really F6.3 being marketed as a sports lens? Maybe on the planet Venus. Rarely is F6.3 enough to stop sports action.
Rarely? I shoot surf at f8.
With what lens, though? Remember, lenses AF at max aperture. AF at f/6.3 is very slow. Even f/8 AF with a body that supports it is rather slow. Compared to AF at f/5.6, which is ok, or f/4 and f/2.8, which is wicked fast.
You may shoot at f/11 or f/16 for your sports...it doesn't really matter, though...as AF is always performed wide open. When it comes to Canon bodies, their AF points offer different capabilities at different apertures. By f/5.6, most Canon AF units only support basic line AF. At f/4 you get full cross type for many points, but the high precision double cross type points require f/2.8.
"Good enough" technology always trumps the "best."
This shouldn't be difficult to accept. There's a reason it's in the 1D X, and purported to be in the 7D II as well. But if you want to see a great implementation of it - just try a D810. Seriously, just try it. Go to a camera store, and slap some 24/1.4 primes on some bodies. Put a 5D3 in 'auto 65 point selection' mode with AI servo, a 1D X in the same mode but w/ iTR engaged, and a D810 with 3D AF tracking mode engaged. Start on a subject in the center (or whatever focus point you've chosen), then move the camera around wildly (or have the subject dance/run around if you want/can). Be amazed at what how the camera can swiftly move the AF point to stay on the subject. Or not.
Lastly if the 7d2's sensor is indeed the same as the 70d then what does that say about Canon's sensor R&D?
Are they going to sit out this recession with their existing sensor technology and wait for the economies of the world to pick up before spending money on R&D? or do they just not have it? Or will they release it later...like we have been 'rumoring' for the last couple of years?
The comparison was being made that if Canon is the best camera making company based on unit sales then McDonalds is the best food making company based on unit sales.
Why are we getting sidetracked by a dodgy analogy?
Exactly! :-)The only real question is: Will mirrorless kill Canon dSLRs before Canon's sup-par sensor technology kills Canon dSLRs?
* battery charge - not equal, partly due to higjher power requirement from EVF/LCD
EVF lag is not that big a deal, it's minimal, keep your other eye open for critical shot timing.
What is the probability that this is confirmed???
Things keep changing. They won't stop changing, and the changes are only going to accelerate.
So is the difference between 294mm/2.8 (105mm) and 300mm/2.86 (105mm).
What you're calling the "entrance pupil" is what I mean by "clear aperture". It's the apparent aperture as viewed from the front of the lens. A long time ago, I was interested in astronomy. "Clear aperture" is the phrase that I heard/read then.
As for wanting constant f/5.6, I don't see that as important or even useful. Remember, the camera body tells the lens what aperture to use and the lens has to figure out how to do it.
Well every quant of light counts.
It´s not much but it´s still better.
And with that weight plus over the Tamron it would be a nice bonus.
But i guess there are reasons for not doing it. Who knows how much more it would weight than.
600/5.6 results in a 107mm clear aperture, same as 300/2.8. The filter size of both this lens and the 120-300 is 105mm. Therefore, the 120-300 f/2.8 can't reach 300mm or be f/2.8 at that focal length.
You wonder if Canon choose this SD card interface to save 7 cents or some crap like that.
Has Canon ever produced a super tele-zoom lens? I mean, something that goes into the 500-600mm range like this Tamron or the newly announced Sigma. If there is such demand, I'm surprised that they have not decided to produce one.