Focusing Screens

Made of translucent material for crisp, sharp images, focusing screens allow for as-it-occurs preview on a viewfinder so that users can see exactly what will be recorded. These screens, some of which are split, quite often have a series of etched codes designating particular areas to be isolated for focus or emphasis. The focusing screen of each model is different than that of any other, but all are designed for precision image-framing.

The split screen and microprism ring combination that makes focusing easy is by far the most popularly employed screen of all non-autofocus 35mm SLR cameras. This is the conventional implemented focusing screen and has been since the 1980s. The split screen provides users added perspective which gives images greater depth and dimension.

Autofocus SLR cameras, however, have a plain screen integrated into its overall design. Many include the etched codes for focal emphasis or exposure calculations. These are common as well.

Among the noted leading screens are those of Nikon and Canon. The former features fifteen different types, from Type A to Type U, with multiple versions of Types G and H that are relation to size, design, and intended purposes. Each type has a differently made screen and is specially made for particular photography contexts. Type A, for example, has a Matte/Fresnel field™ with a split-image rangefinger™ and is ideal for general photographic situations, whereas Type E, although also consisting of a Matte/Fresnel field™, is distinct with etched line designations for both vertical and horizontal axes, especially workable for architectural photography. Type C, having a fine-ground Matte field, is designed for high-augmentation in visual production and is utilized in photomicrography, astrophotography, and other specialized professions. The unique thing about Canon focus screens, though, is the precision matte and grid for easy focus and open measurements for making adjustments on any of a number of shooting conditions. Customizations here make these DIY focus screens, which many photographers like. The Canon screen seems to accommodate personal preferences.

Focus screens are easy to maintain with the right cleaning liquids. A clean focus screen is always preferred because dust can easily distort images and make previews difficult. Any accessories needed for screen maintenance can be found online at reasonable rates.

Whichever type camera one wants, the focus screen makes the difference in determining quality photography. Regardless of the particular model, the Matte frame and etched focus code designation make customized focusing effortless.