50mm Prime with Resolution for a D800? Come on Nikon/Sigma!

Started Jan 4, 2014 | Questions thread
Reilly Diefenbach
Reilly Diefenbach Forum Pro • Posts: 12,376
Re: 50mm Prime with Resolution for a D800? Come on Nikon/Sigma!

Scott McMorrow wrote:

At f/8, sure. But that is pretty arbitrary, isn't it, and not what the OP stated. Diffraction limits all lenses with a D800 sensor at f/8. You are right, they all look the same in the center.(at least reasonably decent lenses do). That is not necessarily the case across the entire frame. At wider apertures there are significant differences in lenses.

Again, show me a photograph with alternating dark and light lines at the pixel pitch, and then we can make a true comparison. The 50mm f/1.8G is pretty darn good lens, especially for the price. Most lenses will resolve all pixels in the center at some degree of contrast. The question is, what is the contrast. (Often referred to as microcontrast.) You will find that a lens like the Otus will have significantly higher contrast than the 50 mm f/1.8G.

My point is that resolution alone is not enough to characterize a lens/camera system. It is resolution with contrast that is important. Lower contrast indicates a larger blur circle. When the blur circle is not dominated by diffraction, then lens aberrations come into play.

Until you can show a photograph or measurement you have made with a standardized method for measuring resolution, your statements and photographs are anecdotal. Interesting at best.

Well, I was hoping for some samples, but I guess we'll be spared, which is completely par for the course.  Fine.  I use the standardized test of my eyes, which tell me when I've run out of pixels on the zoom in.

One question for the prop heads, though.  Why would Nikon build a 36MP camera if the lens was really the resolution bottleneck and no one could see the difference between it and say the D600? Only one answer, folks:  We can.

Want better than D800e detail?  Get a Phase One and count some more pixels.  There's no lens bottleneck at 80MP either :^)

IQ 180

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