Crop Factor, Low Light and Aperture with m4/3 lenses? Part 2

Started 6 months ago | Discussions thread
Just another Canon shooter
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Re: Crop Factor, Low Light and Aperture with m4/3 lenses? Part 2
In reply to Anders W, 6 months ago

Anders W wrote:

My point is that the "enlargement theory" proposed in the OP of this thread is wrong. Whatever advantages the larger format has, that's not the way it gains them.

Using wrong arguments to disprove a wrong theory does not make you right. None of the posters here which are still active says that it is a simple matter of more enlargement.

Rather, the simple truth is that it is easier, regardless of sensor size, to make an f/2.8 normal lens that performs well wide open than to make an f/1.4 normal lens that performs similarly well wide open. The aberrations you have to correct for decent performance are simply smaller at f/2.8 than at f/1.4 and that's it.

Right.

The lowly Canon 50/1.4 at f/4 beats the Panasonic 25/1.4 at f/2 by a comfortable margin (PZ) both in the center and at the borders,

Did you see the big sign on PZ's home page saying that their results are not comparable across sensors/platforms?

That is what you actually get in reality.

Panasonic 25/1.4 on E-M5 (16 MP)

1.4 690/590

Canon 50/1.4 on 5D2 (21 MP)

2.8 920/690

See? The 25/1.4 is well behind. BTW, the figures are per picture height. Per diameter, you have to add 8% to the FF format.

As I said, I don't find much need for the shallow DoF that comes with a 50/1.4 wide open on FF and the lens is big and heavy.

And yet, you cannot tell just by looking at a few pictures which DOF is enough for you. Do you find the DOF below too shallow (sorry for the boring photo)?

I'd much rather have the FL control (more lenses in my bag rather than in a drawer back home) that I get with MFT.

One good way to get FL control is to have a capable zoom (with less lenses in the bag). The m43 system has no meaningful answer to the FF f/4 zooms.

EDIT: DXOmark contradicts your claim that the 20/1.4 is sharper than the Canon 50/1.4 (as PZ does), by far, but you knew that, right?

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Canon EOS 5D Mark II Canon EF 15mm f/2.8 Fisheye Canon EF 35mm f/1.4L USM Canon EF 50mm f/1.2L USM Canon EF 135mm f/2.0L USM +4 more
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