I recently sold my D810 to get the Sony A7R II after it was announced by Sony, so I received it less than a week ago after ordering from Amazon. The specs were too tempting, especially with Nikon being somewhat stagnant in regards to innovation on the mirrorless front. Although I loved my D810 for landscape images, lugging the camera and tripod when going on vacation or hiking with a 20 month old child, has it’s challenges. The thoughts of a lighter set-up and the 5-axis image stabilization is what finally pushed me over; the 42MP BSI sensor was just the icing on the cake as I would have gone to Sony even if they stuck with 36MP.
While working hard on reviewing the Nikon D810 DSLR, we are doing our best to continue providing detailed coverage about the camera and its capabilities to our readers. Although we have been very happy with the improvements we see on the D810 (which does deserve high praises for its overall performance), we have identified one issue that probably needs Nikon’s attention sooner than later – the D810 seems to have a thermal noise issue when shooting very long exposures. In certain conditions, the camera seems to be produce very fine grain at low ISOs (even base ISO) that should not be there. Although most photographers probably will not notice it, those that photograph the night sky, architecture, waterfalls and seashores at exposures longer than 20 seconds surely will. The grain appears to be of different color and spread, which means that what we see in images are essentially hot pixels. Please note that these hot pixels are not of the same permanent kind discussed in this article – these hot pixels appear as a result of heat and they appear in different locations of the frame. Although such “thermal” pixels are very common in digital camera sensors and are supposed to show up when shooting long exposures, camera manufacturers usually clean them up, whether you shoot in RAW or JPEG format. This clean up happens in the image processing pipeline, before RAW and JPEG files are generated.
Another frequently asked question from our readers is related to dead, hot and stuck pixels they encounter in images or on camera LCD screens. Since there is so much confusion about these different types of pixel defects/malfunctions (people use them interchangeably without understanding the terms), I decided to write a quick article explaining the difference between them to avoid any confusion. Please bear in mind that there is no consensus between photographers when it comes to defining the types of pixel defects. The below information is my way of categorizing defective pixels that you might not agree with.