Pentax files a patent for a DA*25-350mm F3.3-5.6ED [IF] SDM lens

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

Similar to Nikon, Pentax filed a patent for a high-powered zoom lens DA*25-350mm F3.3-5.6ED [IF] SDM:

• Patent application: 2011-8234
• Release date: 01/13/2011
• Filing date 05/22/2009
• Focal length: 25.71-339.99mm (13.22 zoom ratio)
• Aperture: 3.3-5.7
• Angle of view: 4.8-60°
• Image circle: 28.48mm
• Back focus: 52.92-108.59mm
• lens length: 174.86-281.04mm
• Internal Focusing