Two photographs were taken on the same day at the same place with the same exposure with the same lens. The only difference was that one did not have the mirror locked up and the other one did have the mirror locked up. Both were hand held. Light was 160 to 160-1 block on the Sekonic light meter incident meter which is overcast. Exposure was 1/250 f8-11. Film is Ilford HP5+400 iso. The lens was 165 f2.8. They were cropped to match, not full frame, and scanned at 2400.
The top one is 14,5 NO MLU
The bottom one is 14,6 YES MLU
There IS an exposure difference. One is lighter and the other darker. Other than that they look the same to me.