I am shooting with a Hasselblad 500 CM and 80mm F2.8 C lens. I self-develop the film then scan it. The last two rolls I shot, I've noticed some of the images have a slightly darkened side or sides. I've included a few examples below. I have not noticed this before, so I am wondering if this is a result of some sort of light leak or damaged light seal, or whether it's something as simple as lens flare that could be solved by using a hood when shooting. These images were shot wide open at 2.8 or possibly 4.0. I would be grateful if anyone could shed some light on what might be causing this. Thanks.