I take product photos for a bedding company, and we shoot inside a home. I use studio strobes, and as far as I know, my camera settings are correct and the photos are well lit. I usually keep the ISO between 200-640 (640 for the darker rooms), and between f/11 and f/22. However, there is still an extreme amount of grain in my images and I am not sure why. I use the companys Canon 80D, and have used a Canon 5d Mark IV, and both cameras still give a lot of grain (although the full frame causes less of course.) I have never had this happen with my images, studio lighting or not, until this job. They've always been crystal clear. Does anyone know why this could be? Would really appreciate any help.