M39x0.75 male to M39x0.5 female thread adapter (pitch converter)

• Front side - M39x0.5 female thread
• Rear side - M39x0.75 male thread
• Machined of high quality aluminium alloyWhy aluminium?.

This adapter allows using filters with so called E39 thread on lenses with M39x0.75 front thread. Both diameters are the same, just different pitches. That is why such adapters are called 'pitch converters' sometimes.