Low Light Wide Angle VS. Art Lens

[ScottS]

Could someone share their thoughts on the Canon 16-35mm f/4 lens? I've read rave reviews on several forums and photographer blogs. I'm torn between this lens and the Sigma Art 1.4. I know that they have very different functions. However, is the low light capacity of the 16-35mm f/4 good enough for lower light situations (not pitch black of course)? My shots will be of people inside buildings, beside campfires, in lower light concerts, possibly some street life shots. I have to choose ($$$) between these two for now, for financial reasons.

Really just wanting to hear your uses and results on these two lenses. I'll have to prioritize.

Thanks!

Scott S

[kvbarkley]

DOF is related to the circle of confusion which is dependant on sensor size.

[Waddizzle]

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@kvbarkley wrote:

DOF is related to the circle of confusion which is dependant on sensor size.

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The CoC constant is used in the DoF calculation, and it is directly related to sensor size.

Like I said, it depends upon your "point of view", lliterally.  With everything else being equal, when FF and APS-C body cameras are given lenses of the same focal length, the calculations say that the APS-C sensor has the shallower Depth-of-Field. This is what my first set of DoF tables is showing.

However, when the FF and APS-C cameras are each given lenses with focal lengths [80mm and 50mm] that result in approximately the same Angle-of-View, then the FF camera body will have the much shallower Depth-of-Field.  This is what my second set of calculations are showing.