vieri Offline Upload & Sell: Off
|
Jman13 wrote:
And it's a massively flawed argument that has no real bearing on image production, because the equivalence ONLY holds if the sensor technologies in the two compared cameras are identical. It's OK for determining similar depth of field requirements, but saying it's truly equivalent is far more false than it is true.
How do you compare lenses when one person is shooting on a 5D classic vs a D800? The D800 is 1-2 stops better at high ISO, so is an f/2.8 lens shot an a 5D really equivalent to an f/4.5 lens on the D800? No, of course not. Similarly, there are APS-C cameras out there right now that have image quality and noise characteristics very much in line with many full frame cameras of only a generation removed, and even very close to as good as some current gen cameras.
F/1.8 is f/1.8. Any noise considerations are a property of the format and sensor design, not the lens, and so while calculating the shallowest depth of field is a consideration, it's pretty much the ONLY way that the 'equivalent' aperture matters...as soon as you stop down a bit, any advantage is gone (for instance, if one needs the DOF offered by a lens at f/4 on full frame, the APS-C shooter can shoot 1-1/3 stops lower ISO and wider aperture.
...Show more →
Exactly, Jman13. The new lens offers THE SAME depth of field control of a 27-53 f2.8 on full frame, but allows you to shoot with ABOUT TWO STOP LESS LIGHT at the same shutter speed. dcjs can put it however he pleases, but put it however you put it, I'll take it any day of the week and twice on Sunday
By the way, I changed the wording in the article so people aren't disturbed by the "light gathering ability" phrasing. The new lens allows you to shoot about two stop faster in equivalent light than a 28-50 f2.8 for full frame, with the same depth of field control. Pretty impressive.
Edited on Apr 18, 2013 at 08:32 AM · View previous versions
|