B
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Provenance & certification
LensSeed tag7-097Serial number5040780
Promaster
Promaster 28mm f2.8
M4228mmf/2.8
฿2,925Sold
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Condition assessed 20/1/2026
How we gradeOptical
4.0/5Mechanical
4.0/5Cosmetic
4.0/5B
Honest disclosure
MinimalDust
NoneHaze
NoneFungus
NoneSeparation
NoneCoating marks
NoneOil on blades
90-day warranty on every lens
As-pictured (ตรงปก) guarantee
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100% authentic inspected & verified
Lens heritageExact match
Promaster 28mm f2.8
The Promaster Spectrum 7 28mm f/2.8 is an all-metal manual-focus wide-angle prime in Pentax KA mount, a rebadge of the Sigma 28mm Super Wide II valued by budget shooters for its build and close focus over outright sharpness.
The history below is for this exact model — it matches the lens you’re viewing.
Optical formula
7 elements in 7 groups (Promaster/Focal MC Auto variant)
