501MC Gehmann iris & push-fit colored rings

• Iris 0.5 – 3.0mm
• In an attractive, anti-reflective matt silver and blue finish
• Laser engraved indications
• Steel threaded connection – which for example enables the use of a diopter
• 5 external push-fit rubber rings which attach to the knurled ring in Red, yellow, green, blue and black
• Designed to provide an illusory optical effect which ensures perfect eye alignment
• An extremely simple and inexpensive idea that gives an exceptional improvement