Canon's release of 600/800mm f11 lenses PROVES you don't need Cannons!

Started 2 months ago | Discussions thread
pforsell
pforsell Veteran Member • Posts: 3,539
Re: Canon's release of 600/800mm f11 lenses PROVES you don't need Cannons!

cosmicnode wrote:

Mark Ransom wrote:

cosmicnode wrote:

Mark Ransom wrote:

cosmicnode wrote:

Hubertus Bigend wrote:

You're still wrong. Yes, with FF you would have had to use ISO 7200. No, the result wouldn't have become worse. Not the file quality, not the depth of field, nothing. The f/11 lens is not even just a bit less "practical" there, except maybe if it would still be a bit larger and slightly less comfortable to handle, which is what these new Canon lenses seem to be at least in comparison to, say, the MFT 100-300, and there I'm not even speaking about versatility yet.

But, and that's the point here – f/11 as such is not the problem.

You don't seem to realise I am talking about the shutter speed not equivalents, if you look at the photo you will see it was taken on FF, That iso of 7200 is in the middle of a bright summers day. if you do the math for 1/1000 of a sec at f11 the iso would be 1800. That is the middle of the day , it obviously gets worse as the light disappears when you reach dawn or dusk or a overcast or rainy day you are struggling to get, a fast enough shutter speed to stop action. To many here are completely caught up on the theory of equivalents and cant see the requirement of a fast enough shutter speed to get the shot. this may not a problem with short focal lengths where you may not need such a fast shutter speed the ibis will help compensate but most turn ibis or vr off for long lenses and action.

And you can't seem to realize that nobody is arguing that F/11 is enough for everybody. It's nice to have choices, even if some of those choices will be more popular than others. The only claim being made is that if F/5.6 is enough on m4/3, then F/11 will be enough on FF. If it isn't enough for you, nobody should argue with that - it's your shot, your requirements.

The shutter speed is 2 stops faster on the m4/3. at f5.5 and according to he theories of equivalence that is the same as a f11 on FF, So a win on shutter speed for the f5.6 on m4/3 if everything else as you say is enough using f11 on FF.

Why do you keep dismissing the possibility of going 2 stops higher ISO on FF to keep the same shutter speed? If it's because you're already using the FF camera at its limits, it means you're outside the shooting envelope of m4/3 and we shouldn't even be having this discussion.

Both M4/3 and FF can have the same iso upper limit, you would in that event still be able to use a shutter speed 2 stops faster on m4/3. The quality of the image may be better on FF but the shutter speeds will be slower, this may be the difference between a noisy image on m4/3 and a blurred image on FF.

Nothing prevents using as fast or faster shutter speed with the FF camera. All you have to do is stop shooting in auto mode.

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Peter

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