Samyang 135mm f/2.0 ED and 85mm f/1.5 UMC VDSLR for astronomy with EAF

Adapting Samyang135mm f/2.0 ED and 85mm f/1.5 IF UMC VDSLR lens for astronomy with EAF or OnStep focuser

EAF holder is compatible for SCT and Newton telescope.

For fine manual focus ring available too.

Optional rings for old Carl Zeiss Jena Sonnar 180mm F/2.8 lens available only for manual focus.

OpenSCAD source code on GitHub

BOM

1x Samynag 135mm f/2.0 ED (Canon, Pentax, Nikon, Sony ....) or 85mm f/1.5 UMC VDSLR lens

1x ZWO EAF

1x ZWO ASiair (Pro)

1x GT2 Timing pulley 20Teeth/Bore 5mm

1x ~400mm GT2 Open Timing Synchronous Belt 6mm (for Samyang 135mm)

1x 136mm GT2 Closed Loop Timing Synchronous Belt 6mm (for Samyang 85mm)

10x M4x20mm imbus screew

4x M4x25mm imbus screew

2x M4x20mm Hex Head Screws

12x M4 nuts

3x M5x30 imbus screew

1x M4 nuts

10x M3x25mm screew

13x M3 nuts

2x Ball Bearing MR115 (5x11x4mm)

1x 1/4" - 20 UNC photo screw

Optional for OnStep focuser

1x Nema17 Stepper motor 17HS15-1704S

1x GT2 Timing pulley 16Teeth/Bore 5mm

4x M3x10mm imbus screew

4x Self Tapping Screw 2x6

1x RJ45 - PCB on EasyEDA

Update

• 2021-01-01 Add beld tensioner
• 2021-01-27 Add support for Samyang 85mm f/1.5 UMC VDSLR and some improved

Category: Other