Pentax patent for a 70-200mm f/2.8 lens

• 12 years ago
• Categories: Pentax
• Tags: Patents

Pentax filed a patent 2012-189817 in Japan for a 70-200mm f/2.8 lens:

• Patent filing date: October 3, 2010
• Zoom ratio: 2.82
• Aperture: 2.9 - 3.0
• Focal length: 70.21 - 198.32mm
• Image height: 21.64mm
• Lens length: 296.16mm
• 17 images lens group configuration 14
• 4 ED elements
• 2 low-dispersion elements
• Internal zoom and f focusing