The Player One M54 Male → M54 Male 2 mm spacer adapter (SKU: POA-M54M-M54M-2) is an ultra-thin connecting ring that has a dual function: it changes the thread gender to male on both sides and adds a precise 2 mm of optical length . Ideal for fine-tuning back-focus correction in systems using the larger M54 × 0.75 thread – e.g. with 3″ flatteners, large filter wheels or coma correctors.

Key Features

• M54 × 0.75 male thread on both sides – convenient "gender changer"
• optical length of only 2 mm – precise back-focus adjustment without excessive extension of the path
• 6061-T6 anodized aluminum body – lightweight, stiff and corrosion resistant
• black interior to reduce reflections and increase image contrast
• manufacturing accuracy of ±0.02 mm ensuring perfect thread alignment

Technical specification

• input thread: M54 × 0.75 (male)
• output thread: M54 × 0.75 (male)
• optical length: 2 mm ± 0.02 mm
• Outer diameter: 56 mm
• material: aluminum 6061-T6, anodized
• weight: 6 g

Such a short M54 → M54 spacer works great in situations where a "bit" of optical path is missing to obtain the ideal 55 mm or when the corrector needs to be moved away from the camera to avoid mechanical contact with thick filter rings. The simple design without moving parts guarantees many years of trouble-free use.