How does the Viltrox 85mm f1.8 e-mount lens perform compared to a 40+ years old Nikkor Ai 85mm classic lens and a modern Sony zoom lens?
Following lenses were reviewed for center and corner sharpness at aperture f5.6 and bokeh quality on a Sony a7 ii full-frame camera:
From left to right: Nikkor Ai 85mm f2 classic lens (with adapter), Viltrox 85mm f1.8 prime lens and Sony FE 24-240mm zoom lens (used at 85mm). Bokeh of the Viltrox 85mm f1.8 e-mount lens
To learn about the bokeh of the Viltrox 85mm f1.8 prime lens, a beautiful church in the style of
in Oberhaching (south of Munich) is used to create the bokeh review photos. The catholic church in Oberhaching was built in 1967 and perfectly falls into the categories of the style of brutalist architecture because it is brutalist architecture, also called brutalism characterized by simple, block-like structures that often feature bare building materials. Exposed concrete is favored in construction.
See a good explanation and nice example buildings of brutalism architecture here:
View the brutalism architecture photos from the church in Oberhaching (south of Munich) to check the bokeh of the Viltrox 85mm f1.8 e-mount on a Sony a7ii full frame camera. Click on any photo to enlarge in 4K UHD resolution:
You can check the bokeh of the Viltrox 85mm f1.8 prime lens also on some other non-architectural photos here. Click on the photos to enlarge in 4K UHD resolution:
The pleasing bokeh of the Viltrox 85mm f1.8 prime lens is very creamy. Nevertheless, it is a characterless creamy bokeh. Extravaganza like a
van Gogh Bokeh of the Carl Zeiss T* 135mm f2.8
Sharpness of the Viltrox 85mm f1.8 e-mount lens
A beautiful church in the style of brutalist architecture is photographed to compare the image quality of the Viltrox 85mm f1.8 prime lens and two other lenses
Center sharpness of the Viltrox 85mm f1.8 prime lens
Click on the photo to view it in 4K UHD resolution (3840×2160) Corner sharpness of the Viltrox 85mm f1.8 prime lens
Click on the photo to view it in 4K UHD resolution (3840×2160)
All center and corner sharpness
photos were shot at ISO-100 and aperture f5.6 at the same lighting conditions and should get the same shutter speed by the aperture priority exposure by the Sony a7ii camera. Right?
As you can see in the exposure information in the yellow text on top left of each photo,
the Sony lens needs 1/800s for a correct exposure while for the Viltrox lens 1/1600s is enough time. The Nikkor 85mm f2 lens is a even faster lens with 1/2000s, but the photo comes out a little bit darker.
This means, that the Viltrox lens transmitts twice amount of light compared to the Sony zoom lens at the same lens aperture f5.6, or has approx. one aperture stop faster
T-stop than the Sony lens.
As you can see in the lens reviews of DxOMark,
the real amout of transmitted light represented by the T-stop value of famous lenses like the Canon EF 24-105mm F4L IS II USM often falls behind the F-stop specification. This Canon lens has an open aperture of f4, but only a T-stop of 4.4 and ususally needs approx. 1/3 aperture stop more light compared to the Sigma 24-105mm F4 DG OS HSM.
Get more information about DxOMark lens reviews and T-stop values here from Tony Northrup:
T-stop value is measuring the real light transmission performance of a lens, while the F-stop is a theoretical value. Rundown
The Viltrox 85mm f1.8 e-mount prime lens performs quite well regarding sharpness and bokeh.
center and especially the corner sharpness is better than the Sony FE 24-240mm lens, on par with the Nikkor Ai 85mm f2 classic lens with a high image contrast. The
bokeh of the Viltrox 85mm lens is very creamy and pleasing but has no special character like the van Gogh Bokeh of the Carl Zeiss T* 135mm f2.8.
T-stop: The Viltrox 85mm f1.8 prime lens needs only half the exposure time as the Sony zoom lens at the same F-stop aperture of f5.6 (see details above). So it is likely that the Viltrox 85mm f1.8 has a good T-stop of below f2 at open aperture, which makes it a good and low-priced performer for available light photography.
Ken Wheeler, the “Angry Photographer” is right: use a ND4 or ND8 grey filter if you shoot this Voltrox 85mm lens at bright sunshine. Otherwise ISO-50 and 1/8000s settings will still overexposure the photos at aperture f1.8 from time to time. The
autofocus is quick and eye focus works also, but slower and less accurate than with original Sony FE lenses.
Considering the price of the prime lens including an useable autofocus, the Viltrox 85mm f1.8 lens is an attractive lens for good object separation especially in portrait photos.
The Viltrox 85mm f1.8 exists also for the APC-C Fuji X-mount. See the
lens review of The Angry Photographer about this Viltrox 85mm f1.8 lens on a Fuji APS-C camera here and listen his advice using a ND-filter and comparing it to a Zeiss 85mm lens: