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  #1  
Old 21st January 2015, 08:51 PM
Jimmy Jimmy is offline
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Default blue filter

hi, I think I understand the concept of colour filters in black and white, but Im a bit confused about the blue filter used in landscapes.

I read somewhere that the blue filter can intensify mist and fog, is that right? its an effect i would really like to utilise at this time of year. but i cant work out if this is true or not. Im ordering a few used cokin P's and Im just deciding if i should get one, and if there i should get a darker or lighter blue.
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  #2  
Old 21st January 2015, 09:22 PM
alexmuir alexmuir is offline
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I've heard similar, but never tried it. Most blue filters are designed for colour correction, but probably see little use nowadays. You can pick them up quite cheaply.
Alex
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Old 21st January 2015, 09:57 PM
Jimmy Jimmy is offline
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Quote:
Originally Posted by alexmuir View Post
I've heard similar, but never tried it. Most blue filters are designed for colour correction, but probably see little use nowadays. You can pick them up quite cheaply.
Alex
i dont think they are used for colour correction in b+w photography lol!

yes some are cheap, though id prefer to get better ones if i had the money, there is a reduction in image clarity i believe in the cheaper ones.
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Old 21st January 2015, 10:12 PM
Tony Marlow Tony Marlow is offline
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B+W say their blue filters renders blue tones lighter but yellow or orange & especilly red darker. Aerial perspective caused by haze and fog is increased and sky will be rendered lighter. They produce (or did) a light blue and a blue filter. Filter factors 1.5 & 2.

Tony
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Old 21st January 2015, 10:40 PM
Jimmy Jimmy is offline
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Originally Posted by Tony Marlow View Post
Aerial perspective caused by haze and fog is increased and sky will be rendered lighter

Tony
perspective increased? does that mean it reduces fog and haze? so you can see further?
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  #6  
Old 21st January 2015, 11:19 PM
alexmuir alexmuir is offline
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The two blue filters currently on offer from Hoya and Lee, and designed for Landscape photography, are actually for colour work. They add a bit of blue to an otherwise pale sky. The traditional range of contrast control filters for black and white consists of red, orange, yellow and green. These come in various strengths, and sometimes yellow-green is included. Although blue has some specialised applications in black and white photography, such as enhancing detail in subjects that are predominantly blue in colour, it wouldn't form part of a normal Landscape filter kit. There would be no reason, however, not to use a blue filter with black and white film if you wanted to see the effect. Most blue filters are part of the 80 or 82 series which are designed for lighting correction with colour reversal materials. They are, however, blue, and will have some sort of effect on black and white film. If you buy a currently available 'blue enhancer' from a reputable manufacturer, it is likely to be quite expensive. An 80A of the same quality could be had for a fraction of the cost. White balance in digital cameras has rendered these, and other corrective filters largely redundant.
Alex.
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Old 21st January 2015, 11:32 PM
Mike O'Pray Mike O'Pray is offline
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It is said that a blue filter will render a normal film in a similar manner to the old blue-sensitive only film. If you look at old prints from old negatives and I am talking about negatives from pre First World War you will see that the sky is rendered white. A blue filter will have the same effect. So if your scene includes sky and clouds and you want detail in the sky then avoid a blue filter.

It will have a remarkably deep effect on red and can help render a red car as very dark which is a colour that on panchromatic film appears much lighter than the human eye sees it.

Mike
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Old 21st January 2015, 11:47 PM
Jimmy Jimmy is offline
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thanks everyone, but my main question is regarding fog and mist! understandably a blue filter will lighten a blue sky, but mist? i suppose a magenta/red will darken greens thereby inadvertently lightening the mist.

i suppose ill just have to experiment.
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  #9  
Old 22nd January 2015, 08:24 AM
Tony Marlow Tony Marlow is offline
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According to John Hedgecoe "Aerial Perspective is caused by atmosheric haze which makes distant objects appear less vividly coloured and less sharply definrd than those in the foreground." So maybe a blue filter could enhance mist or fog but you would need to experiment to find out. I think aerial perspective is more to do with the blue light you see in distance views caused by the atmoshere.

Tony
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Old 22nd January 2015, 10:08 AM
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Xpres Xpres is offline
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It will lighten light/pale coloured whitish things by removing some of the shady bluey bits... so yes it will enhance the mist and fog and exaggerate haze or whiten snow, . Used to be called a 47 blue I think.
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