ivojo
Multimedia
Emailsales@ivojo.co.uk Telephone0844 332 0530
Shopping Cart Shopping Cart

Glossary: APOCHROMATIC

Apochromatic means "free from chromatic and spherical aberration", and is said especially of a lens in which rays of three or more colours (typically R, G and B) are brought to the same focus. As normal lenses focus different wavelengths of light (ie. the different colours in an image) differently, apochromatic lenses to ensure all colours in the image are focused at the same plane. This again ensures perfect display of details, and perfectly focused images down to sub-pixel level - it is for instance easy to show single pixel mirrors in a focused image, with the hinge clearly showing in the middle. Apochromatic lens designs thus improve contrast and sharpness by not letting the light scatter around on the projection screen, and do not discolour projected images.

Aberration
AC-3
Active Matrix
Active Video
ADC
Addressable Resolution
Aliasing
ALIS
Ambient Light
Anamorphic
ANSI
ANSI Lumens
Aperture
Aspect Ratio
Audio In and Out
Authoring Systems
AVI

Back to Glossary Page