So the light source continuously changes in brightness and color temperature. Source of the ProblemĪs explained in detail in this excellent article by Curtis Newport, artificial lights (especially of fluorescent type) emit light in different intensities and wavelengths. If you have read the original article, please accept my apologies for the provided information. I decided to rewrite the article and post about this particular issue, so that others that encounter the same problem understand why it happens and know how to best deal with it. When I initially posted this information on the site, asking if any other readers have encountered a similar problem (which I needed to gather for the upcoming Nikon Df review), a number of our readers, including experienced photographers like Bjørn Rørslett (who I am a big fan of) indicated that it had nothing to do with the shutter freezing, but rather with the A/C phase cycles. I have seen flickering issues before, but none of them were as dark as on the first photo, so I did not think that it could be related to artificial light.
Here is another photo from the same series, with a much better exposure, but still some visible flickering effect on the bottom of the image: NIKON Df + 58mm f/1.4 58mm, ISO 6400, 1/320, f/2.8 The weather was very cold outside (about 20☏) and when I looked at the photographs and saw the problem later that night, I thought that perhaps the shutter froze and somehow caused issues.
I took my family to a local park that was decorated with Christmas lights and snapped some photos.
Take a look at the following image, which I captured in a low-light situation using the Nikon Df: This can happen both when taking an image and when recording videos. This is a similar “flickering” issue that you see when photographing or video-recording a TV screen – different light frequencies cause the flicker that is recorded by the camera. Due to the different intensities and wavelengths of light emitted by fluorescent and other sources of man-made light, there might be severe variations in exposure when photographing at fast shutter speeds. When photographing in artificial light, one has to always watch out for the potential light frequency issue.
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