Latest or all posts or last 15, 30, 90 or 180 days.
Memory Deals, Thunderbolt Drives, Performance Upgrades, and More

Nikon Z7: Thin 1.1mm Sensor Cover Glass Gives Promise of using M-Mount Lenses with Good Performance

See my Sony mirrorless wishlist and Nikon mirrorless wishlist and Canon mirrorless wishlist.

Update 2018-11-03: turns out that the 1.1mm figure from KolariVision for the sensor cover glass does not include the expoxied-on glass portion of the sensor. So the real figure is ~2.3mm total glass thickness, not 1.1mm (Nikon D850 is about ~2.5mm). Still 2.3mm is notably more thin than the 3+ mm for Sony mirrorless. I’ll have to see what actual testing shows.


The Kolarivision teardown of the Nikon Z7 finds that the sensor cover glass is only 1.1mm thick, which is much thinner than the 2mm on most cameras:

Another unique aspect: the cover glass of the Z7’s sensor is about half a thick as the Sony’s, coming in at 1.1mm. This means the Nikon will have better performance with adapted lenses right out of the box. However, with our ultra-thin conversion measuring down to 0.2mm, the camera will still benefit a great deal from a modification service if you’re a Leica lens (or other legacy glass) enthusiast.

The thinner glass means that the MTF (micro contrast and astigmatism in particular) degradation will be much less than on the Sony A7R III, suggesting that M-mount lenses (Leica M and Zeiss ZM) may perform reasonably well. Though a high refractive index cover glass cannot be ruled out AFAIK.

See ray angle and Zeiss ZM 35mm f/1.4 MTF on Mirrorless Cameras for a full aperture set of MTF graphs for the Zeiss ZM 35mm f/1.4 Distagon. It would be wonderful if the ZM 35/1.4 and my Leica M lenses worked well on the Z7 (assuming an adapter materializes).

Depiction of ray paths through sensor cover glass

The graph below is a through-focus MTF graph which indicates the displacement of the blue-vs-red wavelengths for two different thicknesses of sensor cover glass. Without sensor cover glass (e.g., film), the red and blue MTF are close to alignment.

With 2.5mm sensor cover glass, the two diverge substantially, so that peak focus can be achieved for only red or blue, but not both. Moreover, MTF for red wavelengths is degraded slightly and MTF for blue increases slightly.

Through-focus MTF for Zeiss ZM 35mm f/1.4 Distagon, without sensor cover glass vs 2.5mm cover glass

Data transfer speeds up to 2800MB/s
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 15 hours unless noted. Certain deals may last longer.
$3199 SAVE $200 = 5.0% $99 FREE ITEMS Canon EOS R Mirrorless with 24-105mm in Cameras: Mirrorless
$1632 SAVE $700 = 28.0% $165 GIFT CARD LG C8PUA 55" Class HDR UHD Smart OLED TV in Electronics: Televisions
$3097 SAVE $200 = 6.0% $78 FREE ITEMS Nikon D850 DSLR in Cameras: DSLR
$1797 SAVE $200 = 10.0% Pentax K-1 Mark II DSLR in Cameras: DSLR
$998 SAVE $400 = 28.0% Sony a7 II Mirrorless in Cameras: Mirrorless
$1798 SAVE $200 = 10.0% Sony a7R II Mirrorless in Cameras: Mirrorless
$3998 SAVE $500 = 11.0% Sony a9 Mirrorless in Cameras: Mirrorless
$5987 SAVE $1839 = 23.0% ZEISS Loxia 5-Lens Bundle in Lenses: Mirrorless
$11594 SAVE $3157 = 21.0% ZEISS Otus ZF.2 3-Lens Bundle in Lenses: DSLR

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.