Kenta wrote: Other than the filter size difference, will the larger 82mm 24-70mm be better a low light because more light can get in?
Kenta wrote: Other than the filter size difference, will the larger 82mm 24-70mm be better a low light because more light can get in?
Kenta wrote: Thank you both. But if the front is larger and able to bring in more light, won't that result in more light , brighter light going out the back?
Yes, 2.8 is 2.8 because that is a scientific measurement but the brightness of the light coming through that aperture can vary. That is why people discuss T-stops. So in fact the answer to the original question could be yes it matters and the larger front lens could produce a higher T-stop value coming through the aperture to the sensor. The T-stop value would also depend on the coatings on the lens elements, how many elements and what type. Maybe the front element need to be larger because the coatings ate up a tiny bit more light or the shape of an internal lens element need more coverage to produce the same coverage and brightness as it passes through it. Only the designer would know.garyrhook wrote:
Kenta wrote: Other than the filter size difference, will the larger 82mm 24-70mm be better a low light because more light can get in?
No. f/2.8 is f/2.8. What matters is what's going through the back of the lens. They must have needed to change the size of the lens for some unknown reason.
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