Nikon D5100 or Sony A57

[fozzybear]

Try taking a series of photos with manual settings. Taking a photo with auto doesn't really tell you much, as a sudden light change can throw an image out.

I shot 400 photos in manual on Wednesday. Every one of them were underexposed.

I'll give things one last chance at Uttoxeter races this Wednesday. I do doubt my 'ability' but on this occasion there's no doubt in my mind that there's an issue with lens or camera.