Monday, 11 July 2016

filters - What causes these green dots in my image?


I just received a 35mm f/1.8 DX lens for my Nikon D50 for Christmas, and took some shots where the lights on the tree were the main source of illumination. Almost all of them exhibit very prominent green after-images of the tree lights. For example, in this image they run from the left side of the mirror down to the left side of the fireplace:


Tree with green lights


Are these artifacts caused by the lens, the camera, the filter (a Tiffen 52mm UV protector), or a combination of them? How can I avoid them in future shots?



Answer



The UV filter likely explains this.


As I've explained in this answer, any filter will degrade image quality, but some do so more than others. Tiffen filters do not have anti-reflective coatings and are thus prone to flare. You should either remove the filter or use a high-quality one from a brand like B+W or Hoya.


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