The Polarizing Filter For Best Editing Photo
So, with the sun at its zenith, rotating the polarizing filter in order to position its axis vertically and positioning at 90 ° to the sun (sun directly overhead and photos taken on the horizon before us) we’re going to filter out a lot of scattered light. A photograph taken in these conditions will produce a darker sky, with contrast enhancements. If “we raise our aims” or we’re going to take a picture of a portion of the sky as high horizon (say 60-45 °), the effect of polarizing filter will be smaller, with lighter color. Finally, if we go to photograph a portion of the sky close to the sun (angle around 10-0 °), virtually raising the “aims” and pointing the lens directly at the sun, the effect of polarizing filter will be almost zero since, as He said, the diffuse component of the light is much smaller.
When the sun is at its zenith, we must bear in mind the rule of 90 minutes photographing in the direction of the sun we will have a very low impact of our filter or no. If on the contrary we photographed portions of the sky away from the sun, things change with the polarizer that begins to do its job. Attention to the photographs with the sun behind (and always at the position different from the zenith): in this case the light there comes from behind http://smilesmultimedia.com, from below. In this case you have to remember that the direction of polarized light is perpendicular to the plane of propagation. This means that the axis of the polarizing filter does not have to be placed vertically but horizontally. In this way photography will again be rich in contrast and with the sky darkened.
Taking a shot with the sun behind it and the filter oriented vertically or with the sun at its zenith and the filter should be oriented horizontally to produce an effect “contrast”, the filter would act on polarized light reducing it and clearing the scene.
Costs. Assuming that the room is ready, this is what you’ll need to create your darkroom: the total is about 370 € with the ability to print at least 100 photographs. For each object listed have reported the amount of needle / prints can be performed and how you see the piece more “expensive” for photos is the paper, while the rest of the members will pay a lot depending on the number of shots developed.
Another very interesting series of videos is the one built by Analogia.it that broke the whole process for the development of photography in seven video which explains, in detail, all the steps.