![File:Absolute surface form of a lens measured by Difrotec's D7.png](http://upload.wikimedia.org/wikipedia/commons/thumb/9/97/Absolute_surface_form_of_a_lens_measured_by_Difrotec%27s_D7.png/800px-Absolute_surface_form_of_a_lens_measured_by_Difrotec%27s_D7.png)
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current | 12:54, 28 April 2017 | ![]() | 2,598 × 1,350 (847 KB) | Diwaker 101 | Cross-wiki upload from en.wikipedia.org |
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