Originally posted by Digitalis The sigma 8-16mm f/4.5-5.6 is actually quite good, I have used mine extensively and apart from the less than stellar flare resistance is is a superb lens - it doesn't have as much field curvature that the nikkor 14-24mm f/2.8 has.
Hmmm, now that you mention it I've never tested the 14-24's macro ability under candlelight.
---------- Post added 05-10-14 at 06:07 PM ----------
Originally posted by Digitalis The sigma 18-35mm f/1.8 has a T stop of t=1.8, the canon 24-70 you are using as an example has a T stop of t=3.4. You are saying these lenses are evenly matched in terms of optical transmittance when this is clearly incorrect.
With how much fling-back I've received, I must not be comparing the 18-35 to anything and, simultaneously, I'm comparing it to everything.
1) I never said anything about transmittance.
2) All I recall ever saying was that the 18-35 would be generically as capable as a ~FF 28-55 F/2.8.
3) Hey, it was a long thread, maybe someone else brought up the Canon and I responded. But that lens probably wouldn't have been my first comparison, I've never used the Canon 24-70.
4) Either way, everyone takes point #2 - a un-impeachable fact - and decided that I was impugning the Sigma, and asked where my parents went so horribly wrong*.
How about this: I'm comparing it to the Tamron 24-70, with a T stop of F/2.8. Or I'm comparing it to the Sigma 200-500 F/2.8
Everyone everywhere should be happy. This is the first APS-C zoom lens that has the same F/stop as a FF lens. More options everywhere.
*exposure to industrial chemicals.
---------- Post added 05-10-14 at 06:21 PM ----------
Originally posted by ElJamoquio People are indeed quite confused. But your advantage is incorrect. APS-C has no advantage in shutter speed or noise at a given DOF - they're the same.
All else being equal, an F/1.8 -> F16 lens on APS-C will give exactly the same DOF with exactly the same noise with exactly the same shutter speed as a F/2.8-F22 lens on FF.
Now *this* guy is a genius.