The new Voigtlander 50mm f/1 Nokton is Cosina's fastest full frame lens to date and it is capable of very high contrast and resolution. That's quite an accomplishment considering it's a relatively compact 50mm f/1 lens. Cosina attributes this feat to the use of a double-sided aspherical element and a newly developed grinding aspherical (GA) front element.
It's a modern, well-corrected optical design with a promise of delivering high performance even wide open. Thanks to its floating element system, there is very low spherical aberration in the images it produces at close distance.
If Cosina's goal was to design the sharpest 50mm f/1 lens while keeping it as compact as possible, from what I've seen so far, it looks like they achieved this. However, there are compromises to every optical design. Due to the compact lens size and super fast aperture, field curvature and pronounced optical vignetting may cause unevenness in the rendering depending on subject distance. (Rendering will be explored in further detail later)
The optical design consists of 9 lens elements in 7 optical groups
The lens weighs 482 grams (without hood), 513 grams (with hood, included). It's compact for a super fast 50mm lens with total length of only 55mm. It has a 62mm filter thread (73.6mm diameter) and focus down to 0.9m.
Main specifications:
Focal length: 50mm
Lens configurations: 9 lens elements in 7 optical groups
Angle of view: 47.8°
Number of aperture blades: 12
Minimal focus distance (MFD): 0.9m
Maximum diameter x total length: φ73,6×55mm
Filter size: φ62mm
Weight: 482 grams (weighted)
Lens hood: Dedicated screw-in hood included (reversible!)
From left to right: Voigtlander 50/1.2, Voigtlander 50/1, Voigtlander 50/2 APO, Leica 50/1.4 Lux
My initial impression after testing the Voigtlander 50mm f/1 Nokton lens at infinity and close distances is that it was designed to achieve the highest resolution and contrast possible at f/1 while keeping the overall size relatively compact.
Rendering is pleasant at close distance where the high amount of blur at f/1 obliterates the background. Because this lens is equipped with a floating system, spherical aberration is mostly absent and subjects focused at close distance remain contrasty and detailed. This is a winning combination if the goal is to isolate the subject. However, at mid and long distance, the out of focus background is uneven across the image field where corners may appear sharper than center.
Although the lens has a very fast aperture, I am able to nail focus using the Leica rangefinder. And that's on the M10-R 40MP sensor, so there are no concerns being forced to use the EVF with this lens.
Physically, it's a well-built and charming lens. There is frameline blockage but nothing troublesome so far, blocking about 20% of the frame. The metal hood is well built and reversible. A nice touch.
The distance markings are painted white and engraved against a black metal barrel which makes it easy to see when shooting outdoors or under low light. Just like with the previous Voigtlander 50mm f/1.2 Nokton, the aperture ring provide distinctive half-stop clicks and the focusing ring is smooth with perfect resistance.
One difference is the black filter thread instead of chrome, which many prefer:
Infinity performance compared to Voigtlander 50mm f/1.2 Nokton
The Voigtlander 50mm f/1 Nokton is optically designed for the Leica M sensor stack, which is a very thin. This initial infinity test will be done on the Leica M10-R (40MP sensor). Later on I will also post results using this lens on the Sony A7R IV camera in terms of resolution and rendering.
Here is the full image thumbnail showing the area demonstrated at 1:1 magnification.
Distance: Infinity
Camera: Leica M10-R
Focus: Center - Best of three @ 12.4x magnification
WB: Daylight
Lens centered using my decentering test. The Voigtlander 50/1.2 Nokton is perfectly centered and the 50/1 Nokton is well-centered.
Software: Lightroom with my default landscape sharpening. All other settings set to default
PS: Vignetting and distortion were NOT corrected. All in-camera corrections turned 'off'.
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Will it perform well at small apertures on the Sony? Here are some 100% crops showing center, mid-field and extreme corner areas.
At 50mm Center Resolution and Contrast: Voigtlander 50mm f/1 Nokton
Center: Voigtlander 50/1 (f/1 vs f/1.2): The CV 50/1 has great contrast and sharpness from wide open but improves slightly at f/1.2
Center at f/1.2: The CV 50/1 has higher contrast and less SA compared to the CV 50/1.2 Nokton wide open
Center at f/1.4: At f/1.4, both lenses look similar but the CV 50/1 still has a slight edge on contrast and resolution
Center at f/2: Both very similar
Center at f/2.8: The CV 50/1.2 looks really good here. Seems to be the optimal aperture for both lenses
Center at f/4: Nothing changes. Outstanding performance for both
Center at f/5.6: First signs of diffraction
Center at f/8: Diffraction reduces micro-contrast and blurs high frequency detail
At 50mm MID-FIELD Resolution and Contrast: Voigtlander 50mm f/1 Nokton
Mid-field: Voigtlander 50/1 (f/1 vs f/1.2): The CV 50/1 has a weaker mid-field but good considering the f/1 aperture. Improves slightly at f/1.2
Mid-field at f/1.2: Similar performance between the CV 50/1 and CV 50/1.2. I see a little bit higher detail for the CV 50/1.2 and higher contrast for the CV 50/1
Mid-field at f/1.4: Both lenses improve at f/1.4. I'd say the CV 50/1 looks slightly better
Mid-field at f/2: Big jump for both lenses. The CV 50/1 still slightly ahead
Mid-field at f/2.8: Another noticeable improvement. Both lenses look similar
Mid-field at f/4: Seems the optimal aperture for both lenses. The CV 50/1.2 improves more and is ahead now
Mid-field at f/5.6: Similar but CV 50/1.2 still ahead
Mid-field at f/8: Similar performance. Diffraction takes hold
Thanks Fred. Having shot with both in real situations do you have a preference of one over the other? Ya know the stuff the tests don't always show like ease of use and personal preference. Heading out the door with a Leica M what 50 of these two would you grab.
airfrogusmc wrote:
Thanks Fred. Having shot with both in real situations do you have a preference of one over the other? Ya know the stuff the tests don't always show like ease of use and personal preference. Heading out the door with a Leica M what 50 of these two would you grab.
I only have the CV 50/1 Nokton for a day so it's hard to say. I think the 50/1 would be my dedicated lens for very low light shooting but the 50/1.2 is of course no slouch.
Rendering comparison to Voigtlander 50mm f/1.2 Nokton
As we already saw from the resolution/contrast test, the Voigtlander 50/1 and 50/1.2 Nokton lenses perform similarly but how about rendering? Aside from the CV 50/1's larger maximum aperture, there is a noticeable difference in rendering between the two.
All the rendering tests were done with the help of the Visoflex 020 to make sure focus was precise for both lenses.
Here are some rendering comparisons various distances:
Scene 1: Focused at 2.5m distance
Thumbnail showing the entire image
CV 50/1 Nokton @ f/1
CV 50/1 Nokton @ f/1.2
CV 50/1.2 Nokton @ f/1.2 - More even rendering and lower vignetting when comparing the CV 50/1.2 Nokton vs CV 50/1 @f/1.2
CV 50/1 Nokton @ f/1: It flares significantly more than the 50/1.2 under same lighting conditions. High Optical vignetting + FC causes the corners to look sharper than center
CV 50/1 Nokton @ f/1.2: Improvement in rendering off-axis at this distance
CV 50/1.2 Nokton @ f/1.2: Although not as sharp, the CV 50/1.2 shows better flare resistance and more even rendering across the field
Sharpness comparison with both lenses wide open: At this distance the 50/1 Nokton appears slightly sharper/contrasty than the 50/1.2 Nokton
CV 50/1.2 Nokton @ f/1.2: A bit overexposed image. (metering error but histogram normalized in post). The 50/1.2 Nokton shows smoother rendering towards the corners even at this distance
When using the Voigtlander 50/1 Nokton on a mirrorless with a thicker sensor stack, field curvature gets amplified and out of focus rendering gets even more uneven. (OOF corners will sharpen up compared to center)
Here is a comparison the subject focused at 3m distance. The A7R IV 61MP file was normalized to 40.9MP to match the Leica M10-R's.
thumbnail showing area of the image being demostrated
LEFT: CV 50/1 on M10-R | RIGHT: CV 50/1 on Sony A7R IV: Lens wide open for both cameras. The OOF focus looks sharper off-axis for the Sony A7R IV's crop
grahamgibson wrote:
Hmm, bokeh looks "a bit rough around the edges"
Fred, you don't happen to have access to a Sony 50GM do you? Has there been a comparison between the GM and the Nokton f1.2?
Yes, I have both lenses. I will test them out. The difference in size/weight between M10-R + CV 50/1.2 vs A7R4 + GM 50/1.2 is comical tough.
David vs Goliath but this time it won't end up well for David.
I am so happy I didn't preorder the Nokton f/1.0 (which required paying the full amount).
The reverse field curvature ruined the idea of getting that lens for me.
The central part of the image looks impressive, but the sides (and corners) are not worth it, having the f/1.2.
