Why not a 12-35 F1.8 - F2.8?

Started Apr 2, 2014 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: Why not a 12-35 F1.8 - F2.8?

JeanPierre Martel wrote:

Anders W wrote:

JeanPierre Martel wrote:

So let's be back at the original question in this thread: Why not even brighter zooms as the next step in the evolution of our gear?

No reason to go back if we are already there. I tried to answer the original question. You didn't.

Sorry if I misread your reply. Let's look at it. You've said:

The fact that a 12-35/1.8-2.8 for MFT is equivalent to a 24-70/3.5-5.6 on FF with regard to total light on the sensor, DoF, and diffraction doesn't mean that the former can be constructed to be as small, light, and optically good as the latter. From a lens design point of view, the former is a more challenging task than the latter. To get an idea, look at the size/weight of the 14-35/2 for FT versus the Sony-Zeiss 24-70/4 for FE-mount.

The difficulty of going equal with FF increases the faster the FF lens with which we are comparing. For example, there are plenty of f/1.4 primes for FF around. But constructing a matching f/0.7 prime for MFT is a near-impossibility.

In a nutshell, you're saying that making a m4/3 F/1,8-2,8 would be challenging. Fine. But is it impossible? If not (coming back at the original question) why not?

It's not impossible to make an MFT 12-35/1.8-2.8. But such a lens would most likely be bigger, heavier, and nevertheless less good optically at equivalent f-stops (e.g., f/1.8 on MFT versus f/3.6 on FF) than its 24-70/3.6-5.6 counterpart for FF.

At a certain point, however, it does become practically impossible to make an equivalent lens for MFT. We know that it is possible to make a 50/1.0 for FF. But a 25/0.5 for MFT, no.

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