The patches are mounted on aircraft grade anodized aluminum and are set below the top surface to help protect from damage. Patch sizes are 1/16” x 1/16”. The overall size is 12/32” high x 7/16” wide x 0.060” thick and are available with either gloss or matte center gray patches. All colored patches on the perimeter are matte finish. Because these targets are hand cut and assembled, very minor patch mis-alignments may occur. They do not affect the target's utility.
Gloss Gray Patches
Gloss gray patches have an extended dynamic range (density ~ 2.4) and are suitable for measuring camera imager noise. Specular reflections from the gloss surface may occur for illumination geometries less than 45°/0° when used without crossed polarizers.
Matte Gray Patches
Matte gray patches have a lower dynamic range (density ~ 1.6) but are more suited to narrow illumination geometries such as those used in endoscopic imaging or with direct on-camera flash units. Because the matte surface can be interpreted as imager noise, we do not recommend using matte gray patch targets for evaluating imager noise in high magnification applications.
Matte with AR Coated Glass
This matte set is available with AR coated optical grade quartz cover glass and are useful in harsh, wet imaging applications. Each has been tested to be water and alcohol proof in submersible environments. The overall size is 5/8” high x 11/16” wide x 5/32” thick.