Ricoh GM-1 specifications:
•Compatible with GR and GR II cameras
•Magnification: 0.35x
•Reduces Focusing Distance to 1.6″
•Multi-coated
•Front Filter Thread: 49mm
•Requires GH-3 Hood and Adapter Set
•Focusing Distance: approx. 4 cm to approx. 8.5 cm (from lens surface)
•Lens design: 3 elements in 3 groups
•Diameter: 52mm
•Total length: 32.3mm
•Weight: 118g