How are lenses graded?

Every lens is scored on three axes — optical, mechanical, cosmetic — then weighted (optical 50%, mechanical 30%, cosmetic 20%) into an overall A–F grade.

Are the product photos accurate?

Every unit is photographed exactly as it is — no stock or AI-enhanced images. The lens you see is the lens you receive.

Every lens carries a 90-day warranty; CLA-serviced units state their own warranty period.

Vintage lenses are sold as-pictured (ตรงปก) with no general returns policy, but every lens is backed by warranty.

Shipping and payment?

Next business-day dispatch, order by 22:00. Pay by card, installments, or PromptPay (Omise).

The standard

How we grade

Honest grading is the product. Every lens is inspected on three axes, combined into a single letter grade, and sold with its faults disclosed — photographed exactly as it is.

100% authentic inspected & verifiedAs-pictured ตรงปก guarantee90-day warranty on every lens

Three axes, one grade

Optical 50% · Mechanical 30% · Cosmetic 20%

Optical

50%

Glass, coatings, internal clarity — what reaches your sensor.

Mechanical

30%

Focus feel, aperture snap, zoom, mount — how it operates.

Cosmetic

20%

Barrel, paint, glass surface marks — how it looks.

Example

Optical

4.0/5

Mechanical

5.0/5

Cosmetic

3.0/5

BVery goodWeighted across three axes

The grade scale

From mint to parts — no euphemisms.

A — Mint / near-mint

Optically flawless, mechanically perfect, barely a sign of use.

AB — Excellent

Optically excellent; only minor cosmetic wear.

B — Very good

Strong optics, normal use; any minor faults disclosed.

C — Good — user grade

Fully usable; visible wear and/or minor optical faults, all disclosed.

D — Fair — flaws noted

Usable with notable faults; for budget or character shooters.

F — For parts / repair

Sold as-is for parts or restoration.

Honest defect disclosure

Every lens is checked against these points — and the clears matter as much as the flags.

CheckedFungus — Mould growth inside the elements.

CheckedHaze — Cloudiness or film on internal glass.

CheckedSeparation — Balsam separation between cemented elements.

Disclosed if presentOil on blades — Oil migration onto the diaphragm.

Disclosed if presentCoating marks — Cleaning marks or scratches on coatings.

NormalDust — Specks inside are normal in vintage glass and rarely affect images.

How this compares to KEH and MPB

The two global used-gear benchmarks, side by side with our standard.

	LensSeed	KEH (US)	MPB (UK/US/EU)
Grade basis	3 weighted axes: optical 50% / mechanical 30% / cosmetic 20%	Cosmetic-based grade; function guaranteed unless noted	Overall condition rating per item
Defect disclosure	Per-copy checklist — fungus, haze, separation, oil, coating — clears shown too	Notable faults noted in listing	Notable faults noted in listing
Photos	The exact lens, as-pictured guarantee	Stock imagery for most items	The exact item photographed
Per-item certificate	QR-verifiable Certificate of Provenance & Condition	—	—
Service	CLA (clean-lubricate-adjust) where needed, disclosed with proof	In-house repair facility	Serviced as needed
Warranty	90 days on every lens	180 days	6 months

KEH and MPB set the bar for used gear worldwide — we borrowed their honesty and added what vintage glass specifically needs: per-axis optics-first grading and a certificate that stays with each individual lens.

Our principle

AI drafts. A human confirms.

We use AI to help identify a lens and draft a cosmetic grade from photos — but no listing is ever published on an unreviewed AI grade. Optical and mechanical condition are assessed by hand, and a person signs off the final grade before a lens goes live.

Every lens carries a certificate

This grade and disclosure travel with the glass on a Certificate of Provenance & Condition — verifiable on-chain and as a physical card, so the story and the honesty stay with the lens.

CLA'd & guaranteed