Have you ever wondered, when stacking a teleconverter and an extension tube, whether it is better to put the TC behind the ET or the ET behind the TC? Neither have I, and yet I set out this morning to get the answer. The photos below were both taken on a D810 with a 50mm f/1.2 Ai-s lens with a 14mm PK-12 extension tube and a Kenko TelePlus Pro 1.4x teleconverter. For the first photo, the equipment was arranged as Camera -> TC -> ET -> Lens; for the second, Camera ->ET -> TC -> Lens. The set aperture was f/5.6 (I have no idea what the effective aperture was.) All sharpening and corrections were disabled. View attachment DSC_2431.jpg View attachment DSC_2432.jpg As you can see, there is very little difference between the two images. Either image is very slightly sharper depending on where you look. I did notice that the second arrangement (Camera ->ET -> TC -> Lens) did not allow me to get quite as close (physically) as the first one. However, final magnification is the same, so that's only a difference in working distance. So, there's an answer! For this particular combination of gear, it makes virtually no difference how you arrange the pieces. You're welcome!