Introduction and Related Links
Most modern lenses are made from plastics, especially acrylic, polystyrene and polycarbonate. Plastics are lighter and tend to transmit more light than glass. Furthermore, optical corrections are more easily accomplished using various plastic elements. Handled with care, these devices have an indefinity life; minor scratches can be removed by polishing the lens with Kimwipes and a tiny amount of fine grade diamond compound (which is not as expensive as it sounds!).
Silver Polyester Film Tape
The best tape for binding glass mounted slides or for taping film in place. Non-bleeding. Won't leave sticky residue at the edges of tape. The best archival tape to use for film taping purposes.
rigid plastic frame
Lightweight rigid plastic frames (temples do not fold) offer a good combination of quality and economy. The best choice when low cost, multiple use, and large quantities are desired. Fit easily over eyeglasses and suitable for children to wear. Plastic frames, usually black but other colours may be supplied. Similar to red/blue rigid plastic frame glasses.
Note: We also sell polarising film in 430 x 300mm sheets. See O7027 below.
clip-on deluxe "flip-up"
For eyeglasses wearers. Universal squeeze centre spring clip for attaching to eyeglasses with the flip-up feature. High quality plastic polarisers 0.75mm thick and about 59 x 64mm in size. Image similar to red/cyan clip on.
full frame and hand held
White cardboard frame, with quality red and blue, green or cyan filter material. Red lens over left eye.
These linear polarised lenses are of superior quality, mounted in aviation-style, black plastic frames, with hinged arms. Lenses are 0.254mm of polariser film. Polarised glasses contain light Gray filters for viewing slide shows, multi-media displays, concerts, movies, and ride simulators. Linear polarised filters are cut at opposing 45-degree angles, which unless otherwise requested are at 45 + 135°; e.g. if the right image is blackened by double polarisation, then after turning the glasses anticlockwise by 90°, the left image is blackened. Polarising sunglasses have both lenses mounted identically and they have a weaker polarising effect. Special orientations can be obtained but an order for several hundred is required.
Hold a polarising filter in front of your eyes, facing the light. Now hold another polariser in front of it and rotate it slowly.
If it is a circular polariser, the rotation will cause the filter to black out on one side only, and not at all if the polariser is turned over.
If it is a linear polariser, it will black out when rotated to 90 degrees whether front on or back to front.