kenw
Veteran Member
Well what is different is that there are a more lenses designed for good corner to corner sharpness at infinity (i.e. flat field at infinity) for FF cameras. Part of that is just that there are so many more lenses made for FF cameras period. I don't think it is any limitation of the technology for m43. The limitation is the size and maturity of the market is all.But do you really think that MFT is any worse in this department (sharpness across the frame) than larger formats? I can't say I have such an impression.The other big deal for landscape photographers is that edge and corner performance can matter a lot. So when someone designs a lens with super high resolution in the center at wide apertures that is great news for a studio or portrait photographer. It is pretty useless for a landscape photographer though. Designing lenses with high resolution corners and flat fields of focus is really, really challenging. And the required filter stacks on top of digital sensors has not made the job any easier...
So I suspect many current m43 lenses would test to gangbusters resolutions in the center. But at the moment even an expensive dedicated prime like the 12/2 which should be wonderful for landscape is already a bit of a let down in the corners at just 16MP.
In FF land you have some spectacular "slow" primes specifically designed for landscape from folks like Zeiss, Leica and CV covering UWA to normal. Simply doesn't exist to the same degree for m43. And that is presently setting an upper limit on corner resolution achievable on m43 that has nothing to do with sensor resolution and everything to do with available (as opposed to theoretical) optics. Put a Zeiss prime or Nikon 14-24 on the D810 or Leica WATE on the A7r and they are untouchable by anything m43 has to offer. On m43 we see corner softness on all the UWA and WA lenses at 16MP stopped down at infinity. With FF if you've got the bucks you can get optics keeping up with 36MP in the corners. Of course they cost astronomical sums compared to most m43 offerings and most of them are much larger too. But the point is they do exist in FF and they don't exist in m43 nor do I ever expect them to exist in m43. I will be giving the 7-14/2.8 a good close sniff when it comes out of course!
Actually seeing the same problem in telephoto at the moment. Looking at more tests of the otherwise truly excellent and amazing 40-150/2.8 it certainly appears it isn't doing anything miraculous in the corners stopped down. So still waiting for a telephoto landscape lens for m43 that can keep up with the various 70-200 offerings from Canikon. And again, I think this is just the market. The 40-150/2.8 appears to be jaw dropping amazing for what 99% of the market is going to shoot with it. Most landscape photographers aren't going to buy m43 or the 40-150 and so you end up with a bit of self-fulfilling prophecy - there aren't many landscape photographers for m43 so no one will build good landscape lenses for m43.
m43 has grown and matured enormously in the past five years, but even with all that growth when you compare it to what exists in the FF world including adapted glass and it just doesn't have the same depth for certain applications.
Again, as you know, for me I find the trade-offs in resolution for m43 to be minor for what I need out of a landscape kit. And I've got the expectation that little will change in the m43 marketplace with regards to that. But from playing with other people's RAW files with various FF lenses on the D800 and A7R it is my experience that there are definitely FF lenses with flat fields and corner sharpness that simply are not offered in any form from any vendor in m43 land.
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Ken W
See profile for equipment list

