Canon Patent For 180mm f/3.5 DO Macro Lens

The EF 180mm f/3.5L Macro

Egami (translated) spotted a new patent filed by Canon for a 180mm f/3.5 diffractive optic macro lens.

  • Patent Publication No. 2014-137484
    • Published Date 2014.7.28
    • Filing date 2013.1.17
  • Example 1
    • Focal length f = 180.00mm
    • Shooting magnification ∞ 0.5x 1.0x
    • Fno. 3.50-4.50-5.20
    • Half angle ω = 6.85 °
    • Image height 21.64mm
    • The overall length of the lens 202.38mm
    • BF 52.18mm
    • Effective diameter of the front lens 58.18mm
    • 12 sheets 8 groups lens configuration

Canon Patent For New Macro Lenses With Hybrid IS (180mm, 200mm, 300mm)

Canon Patent
180mm f/3.5 Macro IS
Canon Patent
200mm f/3.5 Macro IS

 

Canon Patent
300mm f/3.5 Macro IS

Egami (translated) spotted another patent filed by Canon, this time for new macro lenses with hybrid image stabilization: 180mm f/3.5 IS, 200mm f/3.5 IS, and 300mm f/3.5 IS.

  • 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

 

Canon Deals: T3i Kit, 6D, 70D Kit, G15, 180mm Macro, Flash Kit (Limited Time Offers)

 

B&H has a bunch of Canon deals, all are limited time offers (3 days or until stock lasts):

 Canon Deals  Canon EOS Rebel T3i with 18-55mm and 75-300mm – $499 + 34.94 free accessories + 2 % reward – price shows up after having added the item to the cart
 Canon Deals Canon EOS 6D body only – $1499 (in cart) + 147.85 Free Accessories + 2 % Reward
Canon Deals  Canon EOS 70D DSLR Camera Kit with 18-135mm and 70-300mm – $1548 (in cart) + 92.40 Free Accessories + 2 % Reward
 Canon Deals  Canon PowerShot G15 Digital Camera – $299
 Canon Deals  Canon EF 180mm f/3.5L Macro – $1,249 (in cart and after $150 mail-in rebate) + 2 % Reward
 Canon Deals  Canon Speedlite 600EX-RT Essential Two Flash Wireless Kit – $1,079.95

Sigma APO Macro 180mm f/2.8 EX DG OS HSM Review (The Phoblographer)

Sigma APO Macro 180mm f/2.8 EX DG OS HSM Review
Image: The Phoblographer

The Phoblographer reviewed the Sigma APO Macro 180mm f/2.8 EX DG OS HSM. It’s nice to see that Sigma is delivering this lens with a padded lens case (a good one, with shoulder strap). From the review:

The Sigma 180mm is a highly impressive lens. Not only has Sigma added their 4-stop OS (Optical Stabilization) system to their existing 180mm macro, they managed to pry open to aperture to f/2.8 up from f/3.5 (where most 180mm macro lenses fall). They have also added 3 FLD elements (similar to Fluorite) to the lens to help combat Chromatic Aberrations (commonly referred to as: CA). All of this results in a lens that is exceptionally sharp, capable of true 1:1 macro magnification and able to be hand-held at speeds well below 1/200 (where one would normally have to shoot this focal length for an acceptably sharp exposure).

Pluses

  • Impressive sharpness
  • Accurate AF
  • Excellent macro capabilities
  • Accurate AF (wait didn’t I already say that? Yeah, it’s that important)
  • Very usable stabilization system

Minuses

  • Somewhat heavy
  • Somewhat specialized (potentially limited uses)
  • Quite expensive at $1699 (at time of this writing)

The Phoblographer’s review has sample images and more information about the Sigma Macro 180mm.

Sigma APO Macro 180mm f/2.8 EX DG OS HSM price check: B&H Photo, Adorama, Amazon USA, Amazon Canada, Canon Canada, Canon USA

Sigma APO Macro 180mm f/2.8 EX DG OS HSM Review

Product description (B&H):

The Sigma 180mm f/2.8 APO Macro EX DG OS HSM Lens (for Canon) is a high-speed macro lens offering a magnification ratio of 1:1 and a focal length of 180mm. This lens is compatible with the Canon EF mount for use on full-frame and APS-C DSLRs.

This lens incorporates 3 FLD glass elements for color aberration corrections, as well as a floating inner focusing system to reduce other aberrations such as field curvature and distortion, resulting in accurate scene rendition from 1:1 magnification to infinity. A Super Multi-Layer coating helps to eliminate ghosting and flare as well as produce images with more contrast and sharpness. The rounded 9 blade diaphragm also provides an appealing bokeh, especially when photographing at the maximum aperture or at 1:1 magnification.

The integrated OS (Optical Stabilizer) system permits users to photograph handheld with shutter speeds up to 4 stops lower than usually possible. An HSM (Hyper Sonic Motor) is also incorporated into the design, ensuring quiet and quick auto focusing and manual focus capabilities.

High-speed f/2.8 180mm macro lens provides 1:1 magnification ratio.

FLD glass elements and a floating inner focusing system help to correct for color aberration, field curvature, and image distortion.

Multi-layer coating reduces ghosting and flare and provides greater contrast and color fidelity.

Rounded 9 blade diaphragm produces an attractive out of focus quality.

Integrated Optical Stabilizer system permits users to photograph handheld with shutter speeds up to 4 stops lower than usually possible.

A Hyper Sonic Motor is incorporated into the lens design, ensuring quiet and quick auto focusing and manual focus capabilities.

 

Sigma 180mm f/2.8 Macro EX OS HSM (f/ Canon) Limited Stock

B&H has the Sigma 180mm f/2.8 APO Macro EX DG OS HSM Lens (for Canon) in stock and ready to ship for $1,688 (click here), but just a limited quantity. Free shipping in the US.

  • 180mm f/2.8 Macro Lens
  • Canon EF Mount
  • 1:1 Magnification
  • Optical Stabilizer Function
  • FLD Glass Elements Reduce Aberration
  • Floating Inner Focusing System
  • Multi-Coating Reduces Ghosting and Flare
  • Hyper Sonic Motor for Quiet Focusing
  • Focus Distance of 18.5″ / 47cm
Click here to open the rest of the article

[Patent] Canon 135mm f/2.8 and a 180mm f/3.5 Using An Apodization Filter

135mm f/2.8
180mm f/3.5

Japanese site Egami (machine translated) spotted another patent filed by Canon. This time it is about a 135mm f/2.8 and a 180mm f/3.5 lens. The news are an apodization filter that should help provide a more pleasant bokeh.

  • Patent Publication No. 2012-128151
    • 2012.7.5 Release Date
    • 2010.12.15 filing date
  • Example 1
    • 137.2mm – f = 135.0 focal length
    • Fno 2.83 -. 3.90
    • 9.1 deg half each painting.
    • Image height 21.60mm
    • 186.7mm – 150.0 full-length lens
    • BF 47.4 – 80.7mm
    • Lens Construction 10 elements in 7 groups sheet
    • 1 UD glass sheet
    • 0.25 times the maximum magnification ratio
  • Example 6
    • 179.1mm – f = 180.0 focal length
    • Fno 3.50 -. 4.00
    • 6.9 deg half each painting.
    • Image height 21.60mm
    • 218.0mm – 199.8 full-length lens
    • BF 70.0 – 89.8mm
    • Lens Construction 11 elements in 7 groups sheet
    • 1 UD glass sheet
    • 0.11 times the maximum magnification ratio
  • (Bokeh) out of focus look of the important
  • Apodization filter
    • The periphery of the filter transmittance is reduced
    • Added to the luminous flux intensity distribution
    • Bokeh is beautiful and the outline of the
  • Apodization element variable
    • If the liquid of same refractive index as the shape of the interface, no variation occurs in aberration
    • To be the same refractive power of the two liquids, the Abbe number is difficult
  • Canon‘s patented
    • Variable element shape
      • Voltage is applied, changing the shape of the interface
      • Obtain the effect of apodization
      • Varying refractive power, the Abbe number
    • To reduce the time variable aberrations of shape
      • By a twist of the material performed, to optimize the absorption coefficient, to suppress the generation of aberration to moderate the curvature of the interface
      • To reverse the two materials (such as liquid), the amount of chromatic aberration, do the negation
      • Suppress the two materials (such as liquid), refractive index, the difference between the Abbe number
    • The entire feeding (with floating)