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

Started 2 months ago | Discussions thread
knickerhawk Veteran Member • Posts: 6,958
Re: Canon's release of 600/800mm f11 lenses PROVES you don't need Cannons!

Mark Ransom wrote:

knickerhawk wrote:

Hubertus Bigend wrote:

knickerhawk wrote:

Hubertus Bigend wrote:

cosmicnode wrote:

They are 2 shutter speeds slower in poor light than a F5.6 lens. 3 shutter speeds slower than the Olympus 300mm f4 with equivalent 600mm FOV.

No, they aren't. Because the camera is already 2 shutter speeds faster than Olympus, as it can and will be used with 2 steps more ISO, if necessary, without getting into a disadvantage.

The disadvantage is that you've given up any DR advantage you otherwise would have had at equal ISO settings [...]

Yes, but that's not a disadvantage of the Canon compared to the Olympus. It's a tie.

Only if you disregard (i.e., delete) the rest of my post. It can't be a tie because the distribution of the DR relative to middle gray is now basically different between the two systems. Which one ends up better will depend on the scene and the photographer's priorities for protecting highlights vs. improved shadow detail.

The relationship between middle gray and high/low limits is set arbitrarily by the manufacturer and has nothing to do with sensor size. You can easily compensate for the difference between systems by using exposure compensation.

Yes, of course, but that's not my point. As you increase ISO, you lose highlight headroom. Depending on the camera and specific ISO, you may gain a little bit of shadow detail. You're effectively shifting where the DR is distributed around wherever middle gray has been set for the camera. Especially with BIF shots, which generally rely on significant boosts in ISO, to enable higher shutter speeds, the extra 2 stop increase required for FF cameras may not be as benign as many assume it is, even if the DR is the same compared to the mFT camera.

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