M48 to M42 (T2) Telescope Camera Adapter | STEP Blueprint

Strictly engineered for CNC turning and milling. This is a mathematically perfect digital blueprint (.STEP format) for an M48x0.75 to M42x0.75 (T2) male-to-male optical adapter.

When mounting heavy, expensive cooled astrophotography cameras and filter wheels, 3D-printed plastic threads can flex or shear off. This .STEP file allows you to load the geometry directly into your CAM software to turn a permanent, structurally rigid adapter out of billet aluminum or brass.

Engineering Specifications:

• Side A: M48 x 0.75mm (Standard 2-inch filter thread) | 5.0mm length
• Side B: M42 x 0.75mm (Standard T2 thread) | 5.0mm length
• Central Flange: 52.0mm Outer Diameter with a 3.0mm thickness to allow for a secure grip or physical knurling on the lathe.
• Clear Aperture: 38.0mm internal diameter to prevent sensor vignetting on APS-C and full-frame chips.
• Thread Starts: 0.5mm chamfers applied to both thread leading edges for seamless engagement.

File Format:

• Includes .STEP file ONLY.
• Note: This asset is modeled to exact nominal dimensions with zero FDM slicer shrink-offsets applied. It is not intended for standard FDM 3D printing.