FILTERS AND FILTER HOLDER SIZES
When we start in photography we either don't know enough, we don't have enough funds, or we are just beginning to get interested. Any of the above of course restricts our choices.
Filter Holder
There is usually some kind of tray here, although the smaller, low-end enlargers may not have one, for filters. The alternative is to use a holder that is mounted under the lens.
This camera setup usually consists of a unit having a camera body and lens, bellows extension, light source, a copyboard, filter holders, and the necessary controls and switches.
Filter: A colored or transparent round glass the size of a camera lens which a photographer attaches to the camera by either screwing it onto a lens, holding it in front of the lens, or inserting it in a filter holder.
The only Cokin product I have is one of their type P filter holders, which is a rectangular filter holder designed for wider-angle lenses.
Camera lens filters are usually glass either dyed or sandwiching a piece of gelatin in a screw-in filter holder. Anything that is placed over the front element of the lens to alter the final image is a filter.
They need to be slid up and down in the filter holder with the transition from clear to dark falling accurately on the horizon or the light sky where you want to obtain a correct exposure.
A similar technique is to cut a bit of window screen to fit in your filter holder. The diffraction will turn your specular highlights into star-like crosses. You'll see this trick in some sporting or music event broadcasts.
Cokin also makes a filter holder for 100 mm filters, which they call the "Z" size. Most of Cokin's filters are made of optical resins such as CR-39.
Slip it on the lens and rotate the filter holder or the polarizer in its mount and check out the effect in the viewfinder.
To add gels or other filters, you use a filter holder that attaches to the front of the light.
Scrims are screens woven from fine wire. Their function is to reduce light output at the source without affecting the color temperature.
This helps the wallet and also the weight of your back pack. Likewise, with the filter holder set up, such as Cokin filters, once you've bought the correct adapter, then the filter holder simply fits all lenses.
If your camera is threaded, then it's easy. Buy a gelatin filter holder and some step-up rings, or buy a threaded glass filter (expensive!). If your camera is not threaded, then you'll have to be creative.
8 and TC-14B (under 20-35) front large pocket 2: Nikon F5 body front small pocket 1: all my filters (4) + Cokin filter holder front small pocket 2: new film front smallest pocket 1: shot film front smallest pocket 2: cleaning utensils ...
There are different ways of attaching filters, for instance screwing a round filter in front of the lens, or sliding a square or rectangular filter in a filter holder which is attached to the lens with an adapter ring.
The filters are typically much larger than the lens diameter to allow then to be positioned with the transition at any angle and any position in the frame. Typical sizes might be 84mm x 120mm (84mm is the width of a standard Cokin filter holder).
Generally coloured to absorb light of certain colours. Can be used over light sources or over the camera lens. Camera lens filters are usually glass either dyed or sandwiching a piece of gelatin in a screw-in filter holder.
Each fits securely in one of the CD slots allowing me to get rid of the bulky plastic cases in which they’re purchased. The black case contains all my screw in filters. Both of these filter holders are kept in a pouch in the front of my pack ...
First of all, if every lens you have requires a different filter size, you will either need a large quantity of duplicate filters, or a filter system that utilizes a filter holder and interchangeable filters.
 See also: Filter, Lens, Photograph, Camera, Photography
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