Reviewing the a7 V reminded me of the challenges, and the importance, of including subjective assessment in reviews. Photo: Mitchell Clark Reviews are, by most definitions, subjective: ultimately they ...

Over on YouTube [Applied Science] shows us how to make an f/0.38 camera lens using an oil immersion microscope objective. The f-number of a lens indicates how well it will perform in low-light. To ...

a Cross-section of the system from direct calculations with peak-to-valley freeform departure (PV) from the base sphere for the second and only freeform surface. b Corresponding spot diagrams for six ...