Tiffen 49mm Deep Blue #47B Color Balancing Filter Speedotron 102C7C This is the versatile Hitec

This is the versatile Hitec HS-425BB servo

Washable plates

25% 20Hz to 20kHz @ 0dBv output

The drive circuit is very simple

Tiffen 49mm Deep Blue #47B Color Balancing Filter Speedotron 102C7C This is the versatile HitecLightens Blue Objects ColorCore Glass Black Aluminum Filter Ring Made in the USA 10 Year Warranty A 49mm 47B Deep Blue Color Balancing Filter from Tiffen is a deep blue filter that accentuates haze and fog. It is also used in dye transfer printing, for contrast effects and color separation and tricolor work (lightens blue tones). Tiffen's ColorCore glass is produced through a process that entails permanently laminating the filter material in between