DWOfPaul wrote:
Is there a reason the T-Stops / light gathering of modern photo lenses are not talked about much in reviews? Is it that the major manufacturers, such as Sony, Nikon, Sigma, and Tamron are all so close to each other and their stated F-stops that it really doesn't matter, or are reviews just not paying attention to this?
For example, if someone were looking for a 24-70mm f2.8 lens to use in low light, would the Sony 24-70mm GM II, Nikon 24-70mm S II, Tamron 28-75mm G2, and Sigma 24-70mm DG DN II all have a similar ability to transmit light or would one lens transmit noticeably more or less light then the others?
I think that it is largely because photographers are typically more concerned with the DOF effect of aperture than the typical relatively small differences in light transmission among most lenses. Most photographers relying on auto exposure are never going to actually notice the difference. (Which is different from claiming that no difference exists.)
If manufacturers did offer t-stop info, it would have to be in addition to f-stop info. Heck, we’d have 100 page forum threads on that mess!)
Apr 08, 2026 at 03:24 PM
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