Spot Lights
Spot Lights

what would be the best f.stop to set my nikon d80 for inside a building using spot lights and low lights?
childrens's play and needing pics of it....too dark
The short answer: use the smallest number possible. Eg. f/3.5.
The long answer: these are very tricky shooting conditions and that might not be enough. Here's what I'd do...
Get hold of a Nikon 50mm f/1.8 (or even better, an f/1.4 version) lens, and get a seat close to the stage. A lot of Nikon users have a 50mm lying around somewhere so if you don't have one already, you probably know someone who does.
Set the camera to Aperture priority mode and dial in f/1.8. The aperture setting of f/1.8 makes the camera 3 stops more sensitive to light compared to the 18-135mm kit lens at f/5.6. The payoff: three stops translates into an 8x faster shutter speed!
Start with a test shot at ISO 800 and go higher as needed. The object is to tweak the ISO until you get a shutter speed faster than 1/100th second. With an ISO of 1600 or the H settings that go up to ISO 3200 you will see a lot of digital noise, but this is always better than using a slow shutter speed and getting blurry shots.
With general stage lights, use matrix metering.
With spot lights, switch from the default matrix metering to the spot meter. To use this effectively, place the central AF point over the face of your subject and half-press the shutter button to get the right exposure reading. The camera will then properly expose for the subject and let the background fade to black. With matrix metering the camera will try to get some detail in the background and as a consequence severely overexpose your main subject.
Don't bother using the pop up flash - it won't accomplish anything from 15 feet. And don't bother using a proper flash unless you want to get into a fist fight with the faculty.
If you've mostly used your camera in auto mode until now this probably sounds insanely complex. It's not that bad really, but I would recommend practicing for an evening.
Best wishes!
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