D.P. Explain please :)

Well...

I appreciate what you're saying and it may indeed be true but...

I actually agree with Ray in that I don't really care or think it matters. If the camera is performing some ISO trickery to compensate for the limitations of the sensor at very fast apertures, does it really matter?

I think there's a threshold when it comes to aperture. Whilst people may choose an f/4 lens over an f/5.6 or an f/2.8 over an f/4 because they want the extra light it provides so they can use a higher shutter speed without pushing the ISO, once you get to f/2 and faster I don't think this is the case any longer.

When you're talking about apertures of f/2 and wider, the principle reason for lenses of this ilk is the shallow DoF the aperture provides. Indeed, the DoF of f/2 and faster lenses becomes their defining characteristic. You use f/1.4 rather than f/2 because you want the shallow DoF, not because you want more light to keep the shutter speed up - that's almost a side-effect at these apertures.

So, for those reasons, I really don't think it's an issue at all personally.
 
Vertigo1 said:
Well...

I appreciate what you're saying and it may indeed be true but...

I actually agree with Ray in that I don't really care or think it matters. If the camera is performing some ISO trickery to compensate for the limitations of the sensor at very fast apertures, does it really matter?

I think there's a threshold when it comes to aperture. Whilst people may choose an f/4 lens over an f/5.6 or an f/2.8 over an f/4 because they want the extra light it provides so they can use a higher shutter speed without pushing the ISO, once you get to f/2 and faster I don't think this is the case any longer.

When you're talking about apertures of f/2 and wider, the principle reason for lenses of this ilk is the shallow DoF the aperture provides. Indeed, the DoF of f/2 and faster lenses becomes their defining characteristic. You use f/1.4 rather than f/2 because you want the shallow DoF, not because you want more light to keep the shutter speed up - that's almost a side-effect at these apertures.

So, for those reasons, I really don't think it's an issue at all personally.
Click to expand...

I think your assertion is incorrect. I shoot all the time at 1.4 to keep the shutter up, or ISO within manageable levels.

As for does it matter. The answer depends on if you are able to use the information to you're advantage or if you care about such advantage.

Personally I just like to be well informed and be able to understand every angle that goes into making pictures so I can make the best decisions I can in the field.
 
To be fair, D.P. never asserted that we should or shouldn't be worried about this effect, or even called it an "issue". He merely stated in another thread that digital sensors don't necessarily realise the light gathering potential that one might assume from the focal ratio of a lens. I then asked for an explanation here, and he clarified the facts, nothing more. The argument about whether we should be concerned or not blew up pretty much on its own!
 
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