I have a gossen lightmeter but still take the readings with my slightly bulkier digital camera because I don't understand the gossen. There must be something very simple I just forget to see.

How does the needle realte to the disks? It's one of these sixtar types. e.g. It's actually impossible to line up f/2.8 with the needle when shooting at 100 asa. It's probably something stupid.

cheers!
Quinten