If you’re using the Sony 16mm lens on the NEX-7 and you’re totally happy, you may want to stop reading right now. For the rest of you, as we’ve seen in previous posts, the Sony 16mm has only modest discoloration of the corners (worst case chrominance shift of 5 CIELab Delta-E, although the luminance falloff,… [Read More]
Archives for January 2012
NEX-7 — correcting images with purple corners
I have been using Cornerfix to correct NEX-7 images that have discolored edges and corners. It does the job, and it does it well. It supports batch processing, which is useful. Originally written to correct deficiencies in Leica M8 images, it works with any camera for which a Adobe DNG file can be generated. Here’s… [Read More]
NEX-7 — purple corner testing summary
Ignoring the brightness falloff towards the corners, which is easy to deal with in image editing and may prove to be esthetically appealing, the most important measure of the purple-corner effect is the change in chrominance (that portion of color that is unrelated to luminance). CIELab provides a formula for calculating chrominance: (a^2 + b^2)^.5…. [Read More]
NEX-7 — Lens testing for purple corners
I’ve now completed making the test images for the following lenses, using the methodology of the previous post: Sony 16mm f/2.8 E mount Leica Tri-Elmar 16/18/21mm f/4 Leica Super-Elmar 18mm f/3.8 ASPH Leica Elmar 24mm f/3.8 ASPH Leica Elmarit 24mm f/2.8 ASPH Zeiss Biogon 35mm f/2 Leica Summilux ASPH 50mm f/1.4 In this post, I’ll report the… [Read More]
NEX-7 — test images for corner color correction
Cameras like the NEX-7, with their high resolution sensors and low flange distances, return to photography the kind of flexibility in lens selection associated with view cameras. That flexibility is not without cost. There is a loss in automation, which is no big deal to most of us. The biggest effect is that the responsibility… [Read More]
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