Hasselblad V to Sony E extension tubes for copy-stand film scanning
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Fully printed V-mount to E-mount tubes: 40 mm for single-shot 6x6, 85 mm for 1:1 and stitched scans, Makro-Planar 120.
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Fully 3D-printed extension tubes that put a Hasselblad V-system lens on a Sony E-mount body, made for digitising 6x6 negatives on a copy stand with a Hasselblad 120 mm Makro-Planar and a Sony A7 II. No metal adapter, no helicoid: the tube length sets the working range and the lens's own focus ring does the fine adjustment.
Two lengths are included:
V-to-E_tube_40mm: 40 mm of extension beyond the V register. With the Makro-Planar 120 this gives about 0.33x to 0.55x, so a single 6x6 frame fills the short side of a full-frame sensor at 0.43x.
- V-to-E_tube_85mm: 85 mm of extension, about 0.71x to 0.93x for 2x2 stitched captures. Add a 21 mm Hasselblad extension tube and you get 0.88x to 1.1x for 1:1 and 3x3 stitching.
The numbers are thin-lens estimates for a 120 mm lens; other focal lengths scale accordingly. build_tube.py (Python, needs trimesh, manifold3d, shapely, scipy) generates any other length: python build_tube.py 60.
Print the two fit-test rings first. They are the bayonet ends alone, cost a few grams each, and tell you whether your printer's tolerances land right before you commit to a 6 hour tube. If the V ring is tight, scale XY by about +0.5 % and retry; same for the E ring in either direction. Apply the same correction to the full tube.
Printing: PETG or ASA, black. Lens end (the 81 mm ring) on the bed, E bayonet at the top. 0.2 mm layers, 4 perimeters, 30 % or more infill. Supports only for overhangs over 60 degrees (they land in the V ring recess and pull out cleanly). Enable "detect bridging perimeters" in PrusaSlicer for the E tabs, as the M42-4-E-Var author advises, and do not support the tabs. The printed E tabs carry about 1 kg with a CF lens; check for rocking before trusting a stitched capture.
Use: the lens must be cocked to mount and unmount, as on a body. The leaf shutter stays open, the camera shutter does the work. There is an M3 hole in the groove under one lug; tap it and run in a grub or thumb screw against the lens lug as a rotation lock. On the copy stand turn off IBIS, use electronic first curtain and a 2 s timer. f/8 is the sweet spot at 1:1.
Credits: the Sony E bayonet geometry is from M42-4-E-Var by Tons_O_Glass (https://www.printables.com/model/295248), the Hasselblad V receptacle dimensions from the Canon EF to Hasselblad V tilt adapter by Whomstevest (https://www.thingiverse.com/thing:4151187). Both CC BY. Thank you both, the bayonets fitted first time.