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Received my Tamron 17-70mm today...

Started 9 months ago | Discussions thread
Dennis Forum Pro • Posts: 21,319
Re: Received my Tamron 17-70mm today...
3

Miguel-C wrote:

Dennis wrote:

Lettermanian wrote:

BeatX wrote:

Uhh.. That Tamron 17-70/2.8 is big! I mean it looks like similar size to any 24-105/4 FF zoom lenses (?)

A 2.8 lens is still a 2.8 lens in terms of light gathering, so there's not a direct comparison to a 24-105 f4.

You've been around here a long time (long enough to have read plenty about equivalence) you can't really believe that ?

Dennis, you are mistaking Depth of field with light gathering. An F2.8 lens will have the same light gathering ability on FF as on APSC. That's why these lenses are big.

No, I'm not. You can only say it has the same light gathering ability *IF* you define light gathering as "per unit area" and that's meaningless to me without knowing the sensor size.

- Dennis
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