Simply put, reflectance is defined as a "measure of the ability of a surface to reflect light or other electromagnetic radiation".
While the polariser hasn't changed the amount of light leaving the surface of the an object, in this case bracken on the hillside, it has remained the same - but the polariser has prevented some of that light from reaching the lens and sensor.
In this case, the striking green landscape of Ireland's Wicklow Mountains, we can easily see the difference between the polarised and non-polarised image.
A few weeks later I saw a tweet, of an Irish painter that I had not heard of before, referencing a landscape from County Mayo in Ireland's west. It was Across the Bog, Mayo by Jeremiah Hoad.
And I was struck by the similarities between this fine oil painting of an Irish bogland scene and my own recent image of the barley field with mountains.
On those rainy, cloudy days where the sun really doesn't make an appearance the light is still great for photography.
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To learn how to photograph seascapes, long exposures like this join me, Panoramic Ireland, for a photography workshop on the famous Antrim Coast and Giant's Causeway all year round.
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The west of Ireland is one of Panoramic Ireland's favourite places to photograph, often the coast is preferred but sometimes, in cloudy conditions, the valleys of the ancient mountains are more scenic.
Here, in County Mayo, sunshine moves through the valley from the steep, rocky sides to the lakey valley floor.
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An hour or so of changing conditions and changing my viewpoint up and down this short stretch of coastline allowed me to photograph a specific image. then to bed and ready for the next morning.