02-21-2020, 11:38 AM
3 lenses I have with me which are pre-floating element, so easy to measure (not thaaat accurate with tape measure):
135mm lens. infinity to 150cm: 15mm
55mm lens: infinity to 150cm: 2mm
20mm lens: infinity to 150cm: 0.4mm
You can extrapolate from those.
Why to 150mm? That is the MFD of this 135mm lens.
Extra data:
55mm lens: infinity to 24.1mm (1:2): 28mm
20mm lens: infinity to 20cm: 3.5mm
135mm lens. infinity to 150cm: 15mm
55mm lens: infinity to 150cm: 2mm
20mm lens: infinity to 150cm: 0.4mm
You can extrapolate from those.
Why to 150mm? That is the MFD of this 135mm lens.
Extra data:
55mm lens: infinity to 24.1mm (1:2): 28mm
20mm lens: infinity to 20cm: 3.5mm