Projection screen WIEN   Characteristics Rating Front Projection ●●●●● Rear Projection ○○○○○ Neutrality of Colour Reproduction ●●●●○ Brilliance of Colours ●●●●○ Contrasts ●●●●● Brightness ●●●○○ Freedom from Hotspot ●●●●● angel of view ●●●●● Soft edge suitability ●●●●● Use with Ambient Light ●●●●●   Special Features: light-grey high-contrast screen providing extraordinary results in combination with modern bright projctors. Best used when ambient light is not controllable. Nearly light impervious. Projection screen BLACKBACK   Characteristics Rating Front Projection ●●●●● Rear Projection ○○○○○ Neutrality of Colour Reproduction ●●●●○ Brilliance of Colours ●●●●○ Contrasts ●○○○○ Brightness ●●●●○ Freedom from Hotspot ○○○○○ angel of view ●●●●● Soft edge suitability ●●●●○ Use with Ambient Light ●●○○○   Special Features: classic, bright-white screen, lightimpervious; higher thickness allows use as roller screen; laying pleats may last