Latest or all posts or last 15, 30, 90 or 180 days.
Welcome to
In-depth review coverage is by subscription.
Also by Lloyd: and
First-time visitor
Upgrade the memory of your 2018 Mac mini up to 64GB
Top deals pages updated daily for Sony, Nikon, Canon, Apple, many more!
Instant rebates, Black Friday deals, etc
See also Holiday Head Start Deals and Shop Early Save Early
Shooting in Eastern Sierra ⛰ thru ~Dec 1st
Nov 19, 19:00 PST.
When feasible I descend for internet service most days, but…
Please expect up to 48 hour delay when subscribing.

Nikon D850: the 2nd Sample is Off Also, both Skewed and Bad Flange Focal Distance

See my Nikon wish list.

Update 30 Oct: I’m puzzled. I set out to repeat the symmetry behaviors at a very far distance (a mile or so)—they don’t show up in the consistent blur-on-one-side fashion. However, I do see significant variation across the frame with 3 different lenses (Nikon 105/1.4E, Sigma 135/1.8A, Zeiss Milvus 135/2)—some of that could be field curvature or build tolerances in the lens. And yet the examples such as the Sigma 135/1.8A examples and the Nikon 105/1.4E test clearly show a problem.

Also, does testing at 100 or 200 or 400 or 1000 meters with an 85mm, 105mm, 135mm lens make that much of a difference versus infinity? Perhaps, since focusing mechanisms must rotate internally. But it was also 30°F colder in testing today, which means the lens mount, sensor and lens all contract slightly, which could also change behavior. Perhaps there is even slop in the lens mount itself—I always felt uneasy about the spring-type Nikon F lens mount; compare it to Fujifilm GFX or Hasselblad X or Canon EF and they seem much more solid, particularly those two medium format cameras.

Whatever the root cause(s), I am now thinking they are multivariate: camera sensor-to-mount parallelism, mount flexibility, focusing distance, temperature, etc. But why then did my trusty D810 seem so bulletproof in consistent behavior? 36 megapixels is only 1.11X different (linearly) from 45 megapixels—not significant.


I’m growing irritated with the Nikon D850, that is, the 2nd sample I have been shooting. More on that below.

The first one had awful problems with sensor to lens mount alignment causing severe left/right skew as well as a flange focal distance error. Nikon PR says it “will take some time” for Japan to give a response. But it has been 15 days since I made the inquiry back on October 12 (25th as I write this).

It is unacceptable to hang any user out to dry like this, let alone a professional photographer. Or is Nikon trying to hide something? Surely a company proud of their product would want to be all over this, immediately. At this point, stonewalling is what I call it.

I have a phone, Nikon has a phone, what exactly is the problem?!

The 2nd Nikon D850

The 2nd sample does not behave well either. It has the same flange focal distance error as the first sample, and it too is skewed, though it is milder, making it harder to spot.

A 45-megapixel camera has to be held to extremely tight tolerances. A higher-res sensor cannot simply be shoehorned in without also tightening up build tolerances. From what I can tell from two bodies, builder tolerances for the D850 suck. The first body in particular shows a serious failure in quality control—it should never have made it into a box without being adjusted to eliminate the problem. That would cost money (to verify and if necessary, to fix). But like lenses it may be a case of shipping and letting the user figure it out and ask for service.

My evidence, and I suppose I should now go prove it with more lenses:

Perhaps this is a “perfect lens storm”, and all of these lenses are “off” including the one proven to be as symmetric as the finest cine lens. And maybe I just won the goofy lens lottery.

When softness on one side of the frame is not fully overcome by f/5.6 (or f/2.8!), that’s a big problem. That’s what I’m seeing with the Sigma 135/1.8 and the Nikon 105/1.4E (well, the Nikon 105/1.4E “gets there” at f/5.6, but not f/4).

Both the first and second samples of the D850 have quality control issues with the sensor to lens mount distance (flange focal distance). Is this sloppy build or deliberate? I have it from an unimpeachable authority confirming this flange focal distance issue as I reported it, it being a distinct error versus my Nikon D810 and all its predecessors for years now. What the heck is going on?

What I want to know from Nikon

  • Is the flange focal distance issue poor quality control, or is it a deliberate change?
  • Can Nikon service adjust a D850 body for correct flange focal distance?
  • Can Nikon service adjust the sensor to lens mount alignment to be to extremely tight tolerance?

The answers to these questions are extremely important for discerning professionals. Until I get answers, I’m feeling extremely reluctant to plunk down $3300 for a camera that can’t shoot straight. I need these answers and I expect so do other Nikon D850 buyers.

B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 14 hours unless noted. Certain deals may last longer.
$797 SAVE $350 = 30.0% $59 FREE ITEMS Nikon D5600 DSLR with 18-55mm and 70-300mm Lenses in Cameras: DSLR
$1079 SAVE $320 = 22.0% $249 FREE ITEMS Sigma 70-200mm f/2.8 EX DG APO OS HSM in Lenses: DSLR
$3498 SAVE $1000 = 22.0% Sony a9 Mirrorless in Cameras: Mirrorless

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2008-2017 diglloyd Inc, all rights reserved.