The MidOpt 40/20 Scratch-Dig Standard

Most MidOpt filters are designed with a 40/20 scratch-dig ratio. What exactly does this mean in terms of your image results? Surface quality is important for optimal image results

Midwest Optical SP625

MidOpt PR032-39 Linear Polarizing Filter

Inspection Tools

MidOpt PR032-46 Linear Polarizing Filter, Used to eliminate or greatly reduce glare, rotating linear polarizers offer maximum flexibility and ease of

PR032-46 Linear Polarizing Filter (M46 x P0.75)

Understanding Surface Quality Specifications

Uniforce Sales and EngineeringMidOpt Filters - Uniforce Sales and Engineering

Midwest Optical Filters Blue Bandpass Filter, 30.5 mm Thread

Midwest Optical Filters Dark Red Bandpass Filter, 30.5 mm Thread

Training Archive

NIST Traceable Scratch Dig Standards