M68M to M42M Adapter – 1.4mm Back Focus | Dark Clear Skies Primaluce Labs 25″ UV-PASS filter（Design for Venus

25″ UV-PASS filter（Design for Venus imaging）

Performance Warranty: Over 80% Output at 25 Years

Professional narrowband imaging

2 x Adaptors

This film is uniquely designed not to alter the optical wavefront

M68M to M42M Adapter – 1.4mm Back Focus | Dark Clear Skies Primaluce Labs 25″ UV-PASS filter（Design for VenusM68M to M42M Adapter 1. 4mm Back Focus This precision machined M68M to M42M adapter is designed for astrophotography setups that require extremely accurate back focus spacing. With an ultra short optical length of just 1. 4mm, its ideal for fine tuning imaging trains involving reducers, flatteners, filter wheels, off axis guiders, and cameras. Finished in matte black to help minimise internal reflections, this adapter provides a clean conversion from