Tag Archives: Optical
Sigma Patents 70-200mm f/2.8 DG OS HSM | Sports Lens Optical Design
According to the Egami Blog, Sigma has patented an optical formula for the 70-200mm f/2.8 DG OS HSM | Sports lens. Patent Description Patent Publication No. 2016-75828 Published 2016.5.12 Submitted 2014.10.8 Zoom ratio 2.67 Focus distance 72.41 118.50 193.38 F-number 2.92 … Continue reading
Posted in Photo Equipment
Tagged 70200mm, f/2.8, Lens, Optical, Patents, Sigma, Sports
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Roger Cicala Provides Thoughts on Optical Quality Assurance
Roger has posted a very objective, well thought out article on lens quality and manufacturing tolerances. It’s definitely worth a read if you have a few minutes to spare. “After we published a number of posts about copy-to-copy variation, people … Continue reading
Posted in Photo Equipment
Tagged Assurance, Cicala, Optical, Provides, quality, Roger, Thoughts
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