The Optec-DSI 3.5x24tpi to AstroPhysics 2.7" adapter converts a DSI 3.5" male thread to an AstroPhysics 2.7" female thread
Specifications
Outside Diameter: 3.74" (95.0mm)
Overall Height: 0.5" (12.7mm)
Clear Aperture: 2.7" (68.6mm)
Back-focus Usage: 0.12" (3.0mm)
Drawing
