Q:

I dropped my Nikon D5100 and the mirror was stuck

... and i was able to fix that with a small screwdriver putting it back into place with help of a youtube video. The problem i have now is that when i take a picture through the viewfinder of my camera, it looks different then when i take it via live view. I will attach two pictures that should look exactly the same and you will see what i mean. 
This is not about exposure or anything, the problem is that i'm "aiming" at the same point and this is the difference. The first picture is taken through the viewfinder.
Did anyone have this problem already and maybe knows how this could be caused and how i can fix it?

A:

So you're close but no cigar on getting the mirror back in position.  It's not seating all the way back down to where it should in the "down" position, so when you take a shot through the viewfinder, that extra bit of an angle is tricking you into thinking things are a bit lower or higher than they actually should be to hit the sensor when the mirror rises and the shutter opens.
It's definitely a mechanical rather than electron issue.  Have another good look at the mirror and work out if it's either not seating far enough, or if something's bent and it's retracting too far on the spring.  
I'm playing with a D5300 and there's a fair amount of tension on the mirror keeping it in place.. are you experiencing that too?  Be gentle.. use a toothpick.
K

