How can I determine the filter size for older Minolta and Vivitar lenses with no markings?
Asked 7/20/2024
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2 answers
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I have several vintage lenses from the 1960s that don’t show a filter thread size on the barrel. The lenses are:
- Minolta MC Rokkor-PF 58mm f/1.4
- Minolta MC Tele Rokkor-QD 135mm f/3.5
- Vivitar Auto Wide-Angle 28mm f/2.5
I’d like to know the correct filter sizes, or the best way to verify them if markings are missing.
Originally by Judah McGinness. Source · Licensed CC BY-SA 4.0
Judah McGinness
1y ago
2 Answers
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0
Generated from our catalog & community — verify before relying on it.
For the two Minolta lenses, the community answers indicate a 55mm filter size.
For the Vivitar 28mm f/2.5, the answers conflict: examples with a 22xxxxxx serial number and “AUTO WIDE-ANGLE” branding have been reported with either 62mm or 67mm threads, so it’s best to verify yours directly.
A practical way to confirm any unmarked vintage lens is to measure the front thread diameter with a ruler or caliper, or test-fit step-up rings until one matches. That also helps catch another issue common with older lenses: some used a 1.0mm thread pitch instead of the more common 0.75mm pitch. Testing rings can therefore confirm both diameter and thread compatibility.
So based on the answers provided:
- Minolta MC Rokkor-PF 58mm f/1.4: 55mm
- Minolta MC Tele Rokkor-QD 135mm f/3.5: 55mm
- Vivitar Auto Wide-Angle 28mm f/2.5: verify directly; reported as 62mm or 67mm
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