Author Topic: 70-300 VR vs 70-200 /4 in the mountains  (Read 5585 times)

Ilkka Nissilä

  • NG Supporter
  • **
  • Posts: 1689
  • You ARE NikonGear
Re: 70-300 VR vs 70-200 /4 in the mountains
« Reply #15 on: July 18, 2017, 16:32:47 »
Well, a 2MP image tells us nothing about the resolving power of a lens.

longzoom

  • NG Member
  • *
  • Posts: 769
  • You ARE NikonGear
Re: 70-300 VR vs 70-200 /4 in the mountains
« Reply #16 on: July 18, 2017, 16:37:55 »
I respectfully disagree. Level of detailing is telling everything.  LZ

Ilkka Nissilä

  • NG Supporter
  • **
  • Posts: 1689
  • You ARE NikonGear
Re: 70-300 VR vs 70-200 /4 in the mountains
« Reply #17 on: July 18, 2017, 18:26:21 »
Resolving power generally refers to the spatial frequency where MTF goes to zero, or the shortest distance between two objects which are just distinguishable in the image.

Since a 1200x1800 image resampled from FX has a Nyquist frequency of 25lp/mm, it can only contain detail at frequencies up to that limit. Nikon's MTF for this lens is nonzero for 30lp/mm therefore its resolving power is higher than 30lp/mm.  I would guess it is quite a bit higher than that in most areas of the frame.