Size comparison of FE 4/2470 on A7 vs Olympus 12-40 f2.8 on GX7

Started Feb 6, 2014 | Discussions thread
technic Veteran Member • Posts: 8,932
Re: apples and oranges

Dennis wrote:

stevo23 wrote:

Since the beginning of photography. The smaller the frame, the higher the resolution has to be and the tighter all the other parameters need to be. It's actually logical when you think about it.

And yet, they manage it in inexpensive lenses, suggesting that it is easier to do so in smaller lenses. Miniscule lenses on $200 digicams outresolve (in terms of lp/mm) expensive interchangeable lenses.

But I think the mixup is in what the person I replied to meant when he said he expects one lens to be "better". Initially, I interpreted it literally; that it's a better lens. But in the context of the discussion, I think he meant that the resulting images will be better. Semantics, maybe, but I think it's two different things. You can get results from a cheap kit zoom on FF that beat an expensive, fast lens on a smaller sensor, but I don't think people would translate that into the cheap lens being a "better" lens.

Comparing the final images is the best way to see which is better, but this can only be done in a very limited range because comparable lenses often don't exist. And often comparable sensors (with same MP number and best available technology) don't exist either. And even if the comparison can be made, people will argue about which one is best, because some designs will be better in the corners while others will be superb in the image center while the corners are crap. All sensors sizes / systems have their pros and cons.

The equivalent of a good and still affordable f/1.4 50mm standard lens for FF is probably not going to happen on m43 (f/0.7 25mm), or it would be very big and expensive. But the other way round, the FF equivalent of a very affordable 25x f/2.8 superzoom lens for 1/2.3" sensor is not going to happen either.

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