That blue hue looks like flash bleed. I have a home brew 35mm that has a little bit of flash bleed and does the same thing if you don't get the cam in there just right. When I say flash bleed I mean the flash is going off and some of the light is making its way down toward the cam lens or lens coverinside the case. Its internally bleeding light in the case. If you can seal that flash off a little better it will go away.