Filter question

aliengrove · 2011-08-21T01:10:19+0100

Apologies for an unusual and perhaps nerdy sounding question, but I was wondering if anyone knows if there is a graduated filter available that will progressively remove blue, and increase contrast, towards the top of the image? Does anyone know if such a thing exists? Or any ideas how I could make one? Ideally, I would like to find a filter that is graduated from the middle to both edges, so the sky and foreground are not affected. A consistent problem with aerial photography is that the image gets more blue, and loses contrast, as the scenery recedes into the distance, due to the increasing amount of atmosphere between the camera and the ground. Also, if I select a part of the image from the horizon to halfway to the foregound, the histogram only covers perhaps a third of the range from 0 t0 255, for example from 80 to 160, sometimes much less than that. I can't use a polariser because the windows are laminated (it causes prismatic effects). A graduated orange/amber filter would block blue light, but also green light, which is not desirable. Tiffen do colour grad nd filters, but they are incredibly expensive (£257.99) for the square ones, which is what I would need, and I am not sure exactly what colour or density is required, so it would be a very expensive experiment. Apart from that, I can't find anything online. At the moment, I use Lightroom grad filters with a light orange hue, which helps. Am I right in thinking that a filter on the camera would allow more information to reach the sensor, and therefore allow more latitude to tweak the picture in PP?

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Plus Member womble womble

7679 posts
18 years
Hertfordshire,
mostly.

Posted 22/08/2011 - 14:11 Link

The only thing I edited was the 8 ) to insert a space so that I didn't get a

K.

Kris Lockyear
It is an illusion that photos are made with the camera… they are made with the eye, heart and head. Henri Cartier-Bresson
Lots of film bodies, a couple of digital ones, too many lenses (mainly older glass) and a Horseman LE 5x4.

Anvh Anvh

10412 posts
18 years
Dordrecht,
the Netherlands

Posted 22/08/2011 - 14:16 Link

My memory is really letting me down then

Stefan

K10D, K5
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Frogherder Frogherder

1776 posts
17 years
Burton upon Trent

Posted 22/08/2011 - 14:35 Link

Tiffen produce Haze2A filters which take out an aweful lot of UV. Used them in high alpine scenery some years ago. I know thats probably closer to sea level than you want.

http://www.tiffen.com/

They also do colour grads, but no idea what colour you'd need

regards
Bernard