Is 24-70 II worth the price

Started Jul 30, 2012 | Discussions thread
Jon Rty Veteran Member • Posts: 3,838
Re: Still incorrect I'm afraid

You posted unnormalized images, ones that do not constitute proof. Take a look at DxO if you want normalized data. The 5DIII at 6400 has a SNR of 1.3Db less than the Ti2 at 1600. But it's important to note that the Ti2 at nominal 1600 has a measured sensitivity of 1220, while the 5DIII has a measured sensitivity of 5176 at 6400. This means that the sensitivity of the Ti2 is more than 2 stops worse at 1600 compared to the 5DIII at 6400, further closing the gap. Add to this the less than two stop advantage in T-stop the Sigma has, and the 30% worse resolution, and it's quite clear how the two stack up.

Comparing a sensor in vacuum makes no sense what so ever when the OP has a specific scenario in mind, eg. the Ti2 with the 30mm F/1.4 compared to the 5DIII with the 24-70mm F/2.8 in low light. Disregarding the lenses offers no value what-so-ever to the OP, and just servers to derail the discussion. And yes, it does very much make sense to compare the Sigma 30mm F/1.4 to the 24-70mm F/2.8, because the Sigma is the lens the OP owns , and the 24-70mm F/2.8 the one the OP wants to buy. You can compare your fantasy scenarios in a thread of your own if you want

graphikal wrote:

Not even close. Your words are just words; I've posted photographic proof.

Comparing sensor performance by comparing lens performance makes no sense whatsoever. Neither does comparing a lens at f/1.4 on crop cameras when the OP desires to shoot an f/2.8 zoom on full frame, roughly equivalent to f/1.8 on crop. This is not new news-- this is basic photographic knowledge.

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