Smart_Photography_-_December_2015_

To darken a blue sky

Note that, using a polarising

filter, you can darken a blue

sky, not a grey sky (grey skies

will of course darken if you

underexpose it!)

To darken a blue sky with a

polariser, the axis of the lens

should be at 90 degrees to the

sun. See the sketch. The thumb

is pointing to the sun; the area

of the sky along the arc created

by the index finger will be

darkened.

90 °

Avoid using an ultra-wide-angle

lens when trying to darken the

sky with a polariser. If you do,

you will get uneven darking.

In an emergency,

a polarising

filter can be used

instead of a neutral

density filter.

With Polariser

Without Polariser

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Smart Photography December 2015