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.
It is a difficult photograph to shoot a landscape like this contre-jour but the movement and colour in the sky, coupled with some good post-processing has resulted in a fine image that is in contrast to shooting with the sun and its clear light (image coming soon in a subsequent post).
Making use of the texture and feeling of this deserted Irish beach at sunset.
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.
Join me, Panoramic Ireland, to learn how to photograph and to see Ireland. Tours and workshops available all year round.
It is common enough even today to see old forge buildings with horseshoe shaped doorways but nowhere else have I seen windows in this style.
The price is based on two people sharing a car and travelling together but what a perfect way to see Ireland, with a friend travelling around the quiet backroads outside of the tourist season, to photograph scenes like those below.
For extra, flights from other US cities can be booked as can an automatic car if the manual (stick shift) option doesn't appeal.
Find out more about the Aer Lingus deals here.