#2. "RE: Manual mode with a tamron lens with adaptor" In response to Reply # 0
Your lens with the adapter is a manual lens, i.e. non-CPU (no electronics). The lens with work in manual mode, but there is no metering on the D40 or any other body like it. You can "guesstimate" the exposure and use the histogram to fine tune it or use a hand-held meter or "Sunny 16" as you thought. The only camera bodies that will meter would be a D7000 or better (not even sure about that with an Adaptall).
#4. "RE: Manual mode with a tamron lens with adaptor" In response to Reply # 3
>Hi Tony, > >>Is this what it is supposed to do? > >Yes! The D40 requires lenses with a CPU in order to provide >metering. > >>If so, how do I make sure I >>have the right combination for the picture? Do I need to >use >>an external meter or use the sunny 16 rule instead? > >Yes! >You can also set the exposure by trial & error using the >histogram. >Good Luck and Enjoy your Nikons! > Sounds like a waste of time for now so I'll look for another way to to do Macro shots. Thank you everyone for your replies.