First off let me say I am not a noob at this, I understand the settings and I have read the manual. It is also doing this with all lenses and the camera was just repair by Canon not long ago and has not been used much as I had foot surgery in Sept. foot got infected and I almost lost the foot so I have not been out photographing much.
Now for some reasons lately in Manual mode my pictures are turned out very dark unless I go all the way down to 4" which is much to slow for what I am trying to shoot and it is of course causing a blurred effect. I would normally take this picture at 1200 FPS when not on a tripod but when I try to do that the picture is jet black. Settings for this are as follows. Canon EF 100-400mm f/4.5-5.6L IS II USM Lens 400mm f5.6 1/200 ISO 100 No flash. I had lighting set for an overcast day. I am hoping it is just something I am forgetting because I have not been shooting much and not a problem with the lens.
Oh I put it in Aperture mode and the pictures are bright enough but it is setting ISO to 6400 every time. I have tried to reset the camera but it does not seem to be resetting as BBF is still on after I have reset the camera. I had lens brace against window of truck though not entirely steady as I could not reach the pool noodle I normally put on window and only had it on the light camera skin. Thank you for any help given.
One thing I realized I forgot to mention when I was laying in bed is if I push the shutter button halfway down everything will get brighter for just a second and then look dark again in the screen and the viewfinder.
