I've discovered that my Sunpak 383 flash won't work automagically with my Nikon D70s since they don't talk much with each other. That's not great, but I can revert to manual mode on my 383 and still get some use out of it.

There are 3 measurement scales on my 383 to assist in getting the right exposure:

• ISO
• Distance to subject in feet
• F/stop

I understand the first two because they're pretty self-explanatory. It's the last one that confuses me.

It lists the F/stop with numbers that correspond to the typical aperture sequence (2, 2.8, 4, 5.6, etc). However, there's nothing that suggests a shutter speed. Obviously, setting the aperture to this number without considering shutter speed isn't going to lead to the correct exposure. I've also seen this sort of absolute f/stop numbering system in other places (ex: light meters).

Is there a way to take a single f/stop number and create an equivalent aperture/shutter combination(s)? (Or is there a chance that my flash f/stop scale refers to aperture and is assuming a specific constant shutter speed?)