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77mm vs 82mm Nikon 24-70mm


3 years 11 months ago #683684 by Kenta
Other than the filter size difference, will the larger 82mm 24-70mm be better a low light because more light can get in?
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3 years 11 months ago #683686 by Nikon Shooter

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?


To make a lens brighter, the front element is a good
place to start but the whole lens design should be
reviewed… and I don't think that + 5mm∅ is enough.
Light is free… capturing it is not!
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3 years 11 months ago - 3 years 11 months ago #683708 by garyrhook

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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3 years 11 months ago #683709 by Nikon Shooter
The way I see it is they added VR to it and that alone justifies
the 5mm as the first version was too close to vignetting.
Light is free… capturing it is not!
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3 years 11 months ago #683714 by Kenta
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?
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3 years 11 months ago #683720 by Screamin Scott
No, because aperture controls the amount of light and the maximum aperture is controlled by the focal length. Thus it makes no difference the circumference of the lens. What may be impacted is the resolution....
Scott Ditzel Photography

www.flickr.com/photos/screaminscott/
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3 years 11 months ago #684393 by Nikon Shooter

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?


That would be an "intuitive" conclusion but, in reality, much more
is needed to brighten up any lens than just the front element.
Light is free… capturing it is not!
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3 years 11 months ago #684437 by Shadowfixer1

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.

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.  
www.betterphoto.com/?ramshots
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3 years 11 months ago #685650 by Ian Stone
Go with the 82mm, much more light and sharper lenses.  A bit heavier.  
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3 years 10 months ago #688552 by Kenta
Thank you, 82mm was the winner for me.  
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