I spent all day yesterday scanning my old slides. Here is my approach:   I used 75 W CREE lamp bought in home Depot. While I do have dichro lamp house C760 , I  decided against it to avoid dealing with the heat. CREE lamp was on for hours in the end without any issues. I tethered my  Canon Rebel T4i camera  to my  Windows 10 desktop running EOS utility using some old USB cable ( I suspect cable may affect the connectivity so I always use the same one known to work) and camera was running tethered for hours. I set up everything - lens, holders, light etc in working config. I removed  the slide from the holder so my lens was seeing the light diffuser. I put EOS utility in live view mode and used color picker to white balance camera against diffuser. My live view on screen became gray. I deselected picker to freeze my white balance. Note how Red, Green and Blue channels get aligned with each other. In the EOS r...