Michael Andrew (01.14.20, 8:48 PM): Hi Jan- Thanks for the Comment and support - I appreciated hearing from you. I would love for DXO to respond. Also, I am not sure you watched the video carefully, as I am differentiating between lens sharpness and total image detail. Those are two different things. Putting the same lens on a low resolution sensor would give it a very low PMP score vs a high resolution sensor as I demonstrated If the lens is exactly the same and the PMPX scores are vastly different, then it isn't a lens sharpness test. Best wishes! M

Jan Verhaagen (01.11.20, 5:26 PM): Dear Michael, I am a fan of your youtube channel. Photography for a photo-enthousiast as I am is an expensive hobby. Unfortunately there are very few reliable unbiassed sources to help you finding out what is the right gear for you. Dxomark however is an exception. I do not understand why Dxomark has not yet reacted on your video. They should do so. I went over and over again on their website. I could not find it anymore. According my recollection they once stated that PMPix scores are an average of the various testresults of a specific lens on a specific camera on a tripod in a lab environment with all compensation and stabilisation off made with all the apertures possible and that a difference of 1 PMPix could not be seen by the human eye. This would make the 13 for the D500 not 13 but a range of 12 to 14. The 23 for the D810 a range of 22 to 24. 12/21 to 14/21 = 57% to 67% 22/36 to 24/36 = 61% to 67% You did your utmost to compare the best results 67% and 67% The lower score 57% can be explained by the fact that diffraction kicks in. According to me DXOmark PMPix is a helpful tool to find the right lenses for your 90D. Greetings from the Netherlands