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Nikon 180mm NIKKOR ED F2.8

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This is the Nikon 180mm F2.8 AIS ED F2.8 Lens from the 80s I recently got and I wanted to do a quick test using my DSLR to find its sweet aperture spot! Here I am looking at sharpness and Chromatic Aberrations. I went through all the apertures on a simple scene near window light.

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Full Frame (My focus spot was the 28mm lettering on the lens)



Sweet Spot

Normally a Lenses “Sweet Spot” is 2 stops down from its widest aperture. In this case f/5.6.

This is wide open at F/2.8. And it’s not bad at all zoomed in.
F/5.6 (suggested Sweet Spot)
F/8. I am much happier here than f5.6. Looking at the Nikon Logo and Strap Clip which appear to be nicely balanced focus wise than f/5.6. If this was a portrait I am thinking.

So for me this lens is best at f/8 at the closest focus distance.

Chromatic Aberrations.

Nikon say “Chromatic aberration is a phenomenon in which light rays passing through a lens focus at different points, depending on their wavelength.”

You can see it in these images real close. Like a purple edging.

f/2.8. You can see the purple banding on the FM3a logo and the strap clip and also along the top plate.

F/5.6 (Still there very slightly on the strap clip)
F/8. It’s now gone.

So I would definitely say my sweet spot for this lens and camera is f/8. And I shall remember this for using this lens on other cameras knowing safe that I can still shoot F/5.6 with still quality results.

Even at f/2.8 and f4 were good.

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