Article Index

Flare

Most wide angle lenses flare to some extent but the questions is always what that extent is. Given Heliar's focal length, it is not that surprising that the lens flares, but it is surprising that the flare is not worse then what it really is. The two samples below show what you could expect from the lens when it is pointed towards the sun. Both wide open, and stopped down, the lens produces flare and ghosting, but fairly minimal amount. The integrated lens hood does not help here at all because of the angle the sun rays are hitting the lens, but can be more useful in less extreme situations. Of course the main challenge with the lens that wide is going to be avoiding getting the sun into the frame in the first place.

 

ISO 160, 1/500, f/4.5, 15mm (Leica M8)

ISO 160, 1/125, f/8, 15mm (Leica M8)

 

Vignetting

Like most wide angle lenses, Voigtlander Super Wide Heliar 15mm f/4.5 shows some vignetting, which arguably is reasonably well contained for such a wide lens. What helps here really is the slower maximum aperture of the lens and smaller sensor of the Leica M8. At f/4.5 the Heliar shows light falloff exceeding ~1.1EV, which is not terribly bad. By f/5.6 vignetting drops to ~0.7EV and drops even further with as you keep stopping down the lens,

 

 

If you are using the lens on M8, vignetting unfortunately would be more painful to fix as it will cause cyan drift in the corners with IR filters. If you did not code your lens, which is how I used it, then Cornerfix or Photoshop are going to be your only options.

 

 

Distortion

The lens is pretty well corrected for distortion - at ~1.1% barrel distortion will be visible in some situations but should not be causing any major issues in real life.