>>3201217>implying that I implied any of those damn things. Like, you could have done the math to make sure you had a valid argument before trying to call me out. It’s pretty simple math. When I said full frame lenses are faster even when you take into account the smaller format size, that’s what I was alluding to.
So let’s go through it. You’ve got MF Digital, crop factor 0.79 (for Fuji and Pentax) or .62 (for the “full frame 645” digitals from Phase One and Hasselblad).
Full frame, 1.0
APS-C, 1.5 (or a little smaller, for canon and Sigma)
Micro Four Thirds, 2.0.
The max aperture of fast outlier lenses for each are:
MF: 1.9 (Mamiya 645 80/1.9)
FF: 0.95 (Noctilux, Canon 7 dream lens)
APS-C: 0.95 (either the above, or there’s a few cheap Chinese 0.95s)
M4/3: 0.95 (same)
There are no fast crop lenses faster than you can get on full frame, so aps-c and four thirds automatically lose. And that Mamiya, even with MF crop factors, is still only f1.1 equiv on a full 645, or f1.5 equiv on crop-645.
But those are outliers. Let’s take COMMON speeds.
MF: 2.8. With the crop factor, that gets you to 1.7 or 2.2
FF: 1.4. Lenses that go to f1.4 are dirt common on full frame.
APS-C: there’s a bunch of f1.2s for mirrorless crop. Multiply that by 1.5 crop factor and you’re only at f1.8 equiv.
M4/3: you know what, they’re manual only Chinese crap, but I’ll grant you the f0.95 here. Multiply by two and you get... f1.9 equiv.
FF 35mm gives you shallower depth of field, both in the normal case and in the crazy outlier trick lens case, than either MF or 4/3.
