Egami has spotted a new patent filed by Canon. The new patent describes the 180mm f/3.5 IS, 200mm f/3.5 IS and 300mm f/3.5 IS macro lenses.
This patent details shows us an improved handheld macro photography is on the way. The new macro lenses described here comes with hybrid image stabilization as well. It looks like all these lenses will be full frame. Canon has filed a patent for the optical formula of a new EF 300 f/4L IS II before.
Canon Patent for 180mm, 200mm, 300mm f/3.5 Macro Lenses with Hybrid IS
See the patent details for 180mm f/3.5 IS, 200mm f/3.5 IS, and 300mm f/3.5 IS maco lenses.
- Patent Publication No. 2014-41224
- Publication date 2014.3.6
- Filing date 2012.8.22
- Example 1
- Zoom ratio 1.37
- Focal length f = 180.03-167.06-131.08mm
- Fno (3.6-4.8-5.8 actual aperture). 3.6-3.3-2.59
- Half angle ω = 6.85-7.38-9.37 °
- Image height 21.64mm
- The overall length of the lens 228.39mm
- BF 68.14mm
- Example 2
- Zoom ratio 1.58
- Focal length f = 198.49-164.7-125.48mm
- Fno (3.6-4.8-5.8 actual aperture). 3.6-2.99-2.28
- Half angle ω = 6.22-7.48-9.78 °
- Image height 21.64mm
- The overall length of the lens 231.65mm
- BF 71.4mm
- Example 3
- Zoom ratio 1.92
- Focal length f = 289.97-213.39-151.33mm
- Fno (3.6-4.8-5.8 actual aperture). 3.6-2.65-2.21
- Half angle ω = 4.27-5.79-8.14 °
- Image height 21.64mm
- The overall length of the lens 294.36mm
- BF 68.05mm
- Canon patents
- Inner focus
- (Part of the fourth lens group) antivibration
- Supports Shifutobure
- Floating
via EG
