Exposure control for contact sheets.

[PlasticSpanner]

This is a contact sheet from negatives taken with my wifes P&S film camera. I suspect the brighter frames are where she's used a flash but should there be such a huge difference in exposure between frames or should they all roughly be about the same?

Sorry about the pants scan, it's a sheet fed office scanner!

 

[Hertz van Rental]

That all depends upon how good you are in a number of ways, so theoretically they should all be the same.
In practice it rarely works like that.
But contacts are done for only a couple of reasons:
To see what you've got and index the film.
To see if it's in focus and worth printing.
Never used to worry too much about them as long as I could see an image.

 

[mistakendavis]

i am always bracketing so mine are all different densities, so no they dont all have to be the same.