Yesterday, I posted some early testing results for the Nikon 300mm f/4E PF ED VR QP (I just threw that last pair of letters in there to see if you were paying attention) on the Nikon D810. I have access to a cult lens of similar focal length and aperture, the Leica 280mm f/4 Apo-Telyt-R.
I thought it might be instructive to see how the Leica legend compared with the Nikon new kid on the block. What camera to use? the Sony a7R has lots of resolution, but its shutter shock precludes lens testing at these long focal lengths. I picked the a7II, which has electronic first-curtain shutter (EFCS), which is really nice for long lenses. Then I ran into a problem. The new Nikon lens has only electronic control of the diaphragm; there’s no lever. All the adapters that I have are either totally dumb, or can only control the diaphragm in Nikon G-series lenses. The only way I could test the Leica and the Nikon lens on the same camera was with the Nikon lens wide open. Pretty limited, but I carried on.
Here’s an aperture series with the Apo-Telyt. I focused on the leaves in the upper left corner. Sony a7II on Arca Swiss D4 head on RRS legs, EFCS on.
The vignetting is similar to what we saw with the Nikon 300 yesterday: definitely noticeable, but not difficult to deal with wide open, down at f/5.6, and no problem at f/8 and beyond.
Here’s the Nikon image of the same scene:
The exposures were the same for the f/4 shots with the Leica and the Nikon lenses, but I added 0.42 EV of Exposure boost in Lr 6 to get the luminance of the two images to approximately match. Since it looks like I overdid it a hair, we can surmise that the Leica passes about a third of a stop more light than the Nikon. Looking carefully at the images, we can also see that the Leica’s vignetting at f/4 is somewhat stronger than the Nikon’s.
Now, let’s look at the upper left corner, blown up 300% by Lightroom’s export code from a 1:1 crop.
Looking good wide open.
Better stopped down a stop.
Marginally better at f/8.
Diffraction rears its ugly head.
Getting a bit soft, at least by comparison to the wider apertures.
Now the Nikon, with another crack at the wide-open Leica image for comparison:
That’s amazing! Not only is the Nikon holding its own, I’d say that, on contrast and sharpness, it’s outperforming the rare and expensive German lens wide open. The Leica image is remarkably free of chromatic aberration, though, as are the Leica images at all stops. The Nikon has green fringes on the right edges of he foliage, and violet ones on the left leaf edges. CA was a lot bigger deal in the wet-processing days than it is now, but the green fringes on the green leaves might be a little tricky to remove automatically. Well, I gave it a try, and Lr surprised me by what a great job it did on both the purple and the green fringing, and all just by clicking the remove CA box after enabling the lens profile.
Interesting sidelight. Not that I wanted to for this tripod mounted series, but there’s no way to set 280mm into the a7II’s in-body image stabilization (IBIS) system. Either the Sony folks think that this Leica lens, and its less rare f/2.8 brethren, are not worth bothering with, or they don’t think people will hand hold them. In the case of the f/4 Apo-Telyt, they may be right. At four and a half pounds, I wouldn’t want to handhold it for any length of time, though the Nikon is a pleasure to hand hold.