Cosina
Voigtländer Ultron 40/2.0 vs Pentax FA 35/2.0


What follows are some images showing the performance of the Ultron 40/2.0.
As a comparison I chose the Pentax FA 35/2.0, which is generally accepted as a very good performer.


Conclusions:
Resolution: Both top in portrait range from f2.0 on.
The FA35 has a weakness at f2 when focussing at infinity.
(Perhaps this is only my copy.)
Contrast: both identical, both top
CA: FA35 shows stronger transversal CA
Flare: FA35 much better

The Voigtländer Ultron SL II 40mm f2.0 is a very good lens for an unbeatable price.
If you are not so much concerned with flare you will get a really top lens.


Disclaimer: This is a test by a layman, who does not really know what he is doing.




Resolution:
Resolution has been tested using the USAF test sheet, tripod, MLU and manual focussing, using a focus array of 20-30 images each.
Of each lot the sharpest image has been selected by visual inspection.


Resolution at a distance of 3m: 100% Crops

Resolution f2.0

Resolution f5.6


Resolution at infinity: 100% Crops
(remember, this is the best out of ca. 20 shots)
Resolution Infinity f2.0

Resolution Infinity f5.6




Contrast:
Contrast has been measured using the method described here, using Image-J.

Contrast at f2.0:
Contrast at f2.0

Contrast at f5.6:
Contrast at f5.6

To show how good the FA35 is,
here a comparison of the FA35 at f2.0 against the FA28 at f2.8:
(this is from another test, therefore the x-axis differs to above) FA35 against FA28



Chromatic Aberrations:

1. Longitudinal CA (Purple Fringing):
The FA35 shows stronger longitudinal CA.
FA35 left, Ultron right
Longitudinal CA

Longitudinal CA

Longitudinal CA


2. Transversal CA 200% Crop
This is the worst example I have found for the FA35. It is normally not that strong.
FA35 left, Ultron right, both f2.0
(Perhaps this is only my copy and has to do with a slight focus error of the FA35 at infinity. Further tests needed.)
Transversal CA





Flare:
The Ultron shows stronger and more colorful flare.
FA35 left, Ultron right
Flare

Another one from the Ultron: (different angle)

Flare Voigtlaender Ultron





Example with the close-up lens at f2.0 and ca. min. focussing distance:










... continue to the field test (DA40 and FA43)



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