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Old 17-11-2014, 02:51 PM
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sil (Steve)
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sil is offline
Join Date: Jun 2012
Location: Canberra
Posts: 1,402
Not really appropriate for astrophotography but very handy for daylight photography. Basically cuts down glare by blocking light from some polarised angles.

On some cameras its hard to see the effect on screen or in the viewfinder. just take the filter outside during the day, hold it up to your eye and slowly rotate it an you should see the effect it has.

It can darken parts of a daytime sky to a deeper blue, sunlight being reflected back off shiny things like grass/leaves can be reduced therefore increasing the colour (good on landscapes), reflections in windows can be reduced (handy if you are shooting something in a display case without your reflection ruining the shot. Likewise it can reduce the glare coming off water so you can see into the water better. Polarised car window tinting will look like a rainbow oil slick.
just practise really, the amount of change depends on the direction you are facing and where the sun is at the time so you will need to constantly adjust the filter as you shoot in different directions. it also means you will be shooting at a slower shutter speed since its cutting the amount of light coming into the lense. It's not meant to be a solar filter to let you safely shoot the sun, nor will it help you shoot nebulae. its effect is easier to see than to explain just go outside and look through it while rotating it.
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