11th December 2003, 08:54 AM
Let's say I get an ambient reading on a flash meter of 1/60 sec at F5.6. And then I use a test flash reading on the subject to give an aperture of F5.6 too. Will the subject be overexposed due to the flash + ambient light? How do you get the flash to ambient light ratio?
11th December 2003, 10:25 AM
If you want to reduce ambient light, you can increase the shutter speed. Ambient light is controlled by both shutter speed (up to a certain point) and aperature so at 1/60 f/5.6, the flash would act as a fill-in (and not double the amount of light).
Originally Posted by Gunjack
11th December 2003, 10:41 AM
flash and ambient light
It should not be overexposed. I assumed that the flash was meant to act as a fill-in. The background should be well exposed if your ambience metering is accurate. Subject should also be well exposed as your fill-in flash was set at same f-stop as your ambience. This is the theortical aspect.
In practice, your pix should be well exposed, however, you may find the fill-in flash too strong, thus 'artificial' looking. Ideally, the fill-in flash should be enough to 'light up' the subject yet look natural. To get it right, you will need to experiment.
I do not understand about your 'ratio'.
11th December 2003, 11:21 AM
if u are using Minolta meters,it will show u the ratio of flash to ambient.The flash meter will show in units of 10, while the auto meter will show 25%,50%,75%,100%. Go to Minolta showroom for the light meter catalogue,there are examples there.
Higher end Sekonic also has this function, but not the polaris one
11th December 2003, 12:13 PM
Thanks guys, especially xfathom69 for the minolta showroom tip!