I like shooting in all modes, except for auto really. I mostly use my 50mm 1.8 lens. Most of the time, I want my Aperture to be wide open at 1.8, but then when I begin to take the picture, the camera sets the shutter to 1/30 or slower. I then have to take the picture in Tv mode to keep the shutter faster than 1/60, but my aperture sometimes changes (especially if I move closer to the subject and don't realize there is more light, the Aperture sometimes changes to 2.8 or even 3.5). I understand that the camera is trying tell me that it needs more light for this picture, but I would like it to adjust the ISO or accordingly, instead of it adjusting the aperture. So is there anyway to tell the camera "you can change whatever setting, but I am holding the camera in my hand, so KEEP THE SHUTTER AT 1/60 OR FASTER", while I control the aperture?