Programmable Filter Wheels features a removable filter carrier system that enables the wheel to be configured for 25 mm diameter, 32 mm diameter filters, or any combination of 25 and 32 mm diameter filters. A proprietary built-in electronic shutter increases reliability and is designed for up to 20 million cycles. It has high resolution encoding is used to provides accurate filter positioning. Adapters are available to mount the new filter wheel to any commonly available microscope. It provides fast, automated and efficient optical filter changing for microscopes. The filter wheel position is digitally encoded which makes it immune to slippage and skipping errors. Accurate filter positioning is essential to eliminate imaging errors that affect the optical performance .The LEP filter wheel is driven by a DC servo motor specifically selected for smooth, quiet, damped wheel motion. It provides flexibility and expandability. The modular controller provides high performance and flexibility. It is widely supported by almost any available imaging software application.