Originally posted by mika. You can't. Because of the crop factor, it's impossible with an APS-C sensor.
There's very little that's 'impossible' to do with an aps-c sensor, it's just that in some cases FF makes it easier, or when it comes to lenses, cheaper. And even then, it's only 1.3 stops difference in DOF for the same FOV, just enough for a
taste of something different, not any radical departure.
Of course for some of us, that
taste is all it took
My main thing is getting a 35mm f/1.2 FOV/DOF with an inexpensive-but-sharp 50mm lens, Getting a 13mm f/1.8 look from a 20 f/2.8, or getting a 120mm f/1.8 look from my 180 f/2.8, or stopping them down to f/4 to get incredible f4 sharpness on the focal plane while preserving an f/2.4 DOF look equiv. Nothing earth-shattering, just an expansion of FL/aperture capabilities and possibilities in the wide to normal range.
But It's really demonstrably false to say you can't get great images from aps-c or even smaller formats, so much so it's not worth going back & forth about.
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