A useful tool I discovered for viewing and setting Exif info in image files (e.g. JPEGs, TIFFs) is Microsoft Photo Info. This is a free tool from MS as part of their PowerTools range.

It can be downloaded from the Microsoft web site here.
Exif data is meta data embedded within image files, usually added by digital cameras, which includes data such as aperture, focal length, shutter speed, white balance, ISO speed and date/time taken. This can be very useful for analysing photos after you’ve downloaded them to your PC to see perhaps where you went right or wrong with a particular photo and how it could be improved. I’m using this info in my series of blog posts describing my own photos.
This tool allows you to see this data easily but also make modifications to fields such as the title, photographer, description, keywords etc. Useful for managing your photos long term.