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Tamron's tests, both in spherical and flat configurations, represent the company's spirit of craftsmanship nurtured over the course of many years. The wide array of test plates serves as solid testament to the quality control put forth at the company's optical element production lines. |
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Master Test Plates |
A pair of Test Plates constitutes the master standard for curvature and/or perfect flatness. Spherical Test Plates consist of a concave and convex pair, while Flat Test Plates are comprised of three flat plate units.
 Test Plates Itemized List |
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Production Test Plates |
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A set of Test Plates is used for inspection of lens elements at the production line. It is replicated from the master. As the pertinent surface sustains wear and tear and/or damage after a period of use, a precisely replicated replacement is produced from the very same master. |
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Tolerance |
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Tamron's Test Plates are produced in conformity with tolerances as specified below: |
| Test Plate |
Diameter |
Accuracy of Curvature |
| Curvature |
Tolerance |
| Spherical |
ø2.5-ø150mm |
<200mm
201-500mm
500mm |
±0.02%
±0.03%
±0.05% |
| Flat |
ø5-ø300mm |
∞ |
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