Canon patent for 30mm F2.8 DO lens for full-frame mirrorless cameras


Another Canon patent for an optical formula that appears to point to a full-frame mirrorless camera, a 30mm F2.8 DO lens. “DO” stays for diffractive optics. I tell you folks, Canon’s full-frame mirrorless camera is coming!

  • Patent Publication No. 2016-102851
    • Published 2016.6.2
    • Filing date 2014.11.27
  • Example
    • Zoom ratio 1.00
    • Focal length 31.35
    • F-number 2.86
    • Angle of view 34.61
    • Image height 21.64
    • Overall length of the lens 85.29
    • BF 29.99
  • Canon patent
    • Positive ShiboTadashi
    • Diffractive optical element (the second group of aperture stop image side)
    • Correct axial chromatic aberration and lateral chromatic aberration of the near-infrared light
  • [0001] The present invention relates to a magnification chromatic aberration correction of the imaging optical system used in a near infrared region from the visible region is suitable especially monitoring optical system.
[via Egami]

Sigma 30mm f/1.4 DC HSM “Art” Review (Photography Blog)

Sigma 30mm f/1.4

Photography Blog reviewed the Sigma 30mm f/1.4 DC HSM “Art” lens (price & specs) for full-frame APS-C DSLRs (45mm on APS-C). While this is one of Sigma’s recent lenses that get one good review after the other, the 30mm doesn’t convince on all fronts. Build quality is au pair with the Sigma 35mm (price & specs) and 18-35mm f/1.8 (price & specs) lenses. The Sigma 30mm appears to suffer from chromatic aberrations and is not fully sharp in the edges (you have to stop down to f/4 for good results). However, still a great lens at a competing price ($499).

From the conclusion:

The Sigma 30mm F1.4 DC A lens […] offers acceptable sharpness wide-open at f/1.4 […], excellent build quality, lovely bokeh and fast and quiet auto-focusing, all at a surprisingly affordable price.

The Sigma 30mm F1.4 DC A is tack-sharp in the centre from f/1.8 onwards, although you need to stop down to f/4 to get acceptable results at the edges of the frame. Disappointingly the lens does suffer from serious chromatic aberrations when shooting wide-open, along with obvious vignetting and some barrel distortion too.

There is also a set of sample pics shot with the Sigma 30mm f/1.4 and a Canon EOS 70D (price & specs).

[via PB]

More product description after the break.

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Sigma 30mm f/1.4 DC HSM Lens Review (ephotozine)

Sigma 30mm f/1.4

ephotozine reviewed the Sigma 30mm f/1.4 DC HSM lens, a fast prime that’s interesting especially for Canon APS-C shooters. In the conclusion they write:

During this test, we did have issues with inaccurate focusing, which may be down to a flaw with the samples provided for review, and were able to resolve using the Sigma USB Dock. Presuming this problem isn’t widespread, then this lens is a great choice for owners of Canon cameras, after a high quality, standard lens with a fast maximum aperture.

The Sigma 30mm f/1.4, part of Sigma’s “Art” line-up,  retails for around $500/€490. The reviewers liked the good sharpness and build quality of the Sigma. However, they noticed that sharpness towards the edges is deteriorating, and some chromatic aberrations at maximum aperture. The review comes with test charts and sample pics.

Sigma 30mm f/1.4 DC HSM price check: Amazon USA, Amazon CA, B&H Photo, Adorama, Digitalrev, KEH Camera, eBay US, Canon USA, Canon CA, BestBuy

Lens specs after the break.

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New Sigma 30mm f/1.4 DC HSM Available For Pre-Order

Sigma 30mm

B&H has the new Sigma 30mm f/1.4 DC HSM (part of Sigma’s “Art” line-up) available for pre-order for $499 (click here). The lens is expected to ship starting from March 31st.

  • Standard Focal Length Prime Lens
  • Aperture Range: f/1.4 – 16
  • Minimum Focus Distance: 11.8″ (30 cm)
  • Hyper Sonic Motor for Smooth Autofocus
  • Brass Bayonet Mount
  • For APS-C Format Cameras
  • Fits Canon EF-S Mount Cameras

From the product description:

The 30mm f/1.4 DC HSM Lens for Canon DSLR Cameras from Sigma is a prime lens designed for Canon APS-C format cameras. Its 35mm focal length equivalent is 45mm which places it in the category of standard focal length lenses. With its particularly fast maximum aperture of f/1.4, the lens will perform very well in low light situations and provides shallow depth of field focus. With updated optical configurations (9 elements in 8 groups), as well as rounded aperture blades, the lens delivers sharp detail and nice background bokeh. Its minimum focus distance is 11.8″ (30 cm).

The lens’ optimized light distribution helps to minimize field curvature preventing a loss of image quality at the edges of photographs and its double-sided aspheric lens element minimizes spherical distortion. A rear focusing system combined with a newly developed autofocus algorithm and Hyper Sonic Motor provide smooth and accurate autofocus. Fulltime manual focus is also supported. As part of Sigma’s “Art” line of lenses it is compatible with Sigma’s new USB Dock, which enables firmware updates and focusing adjustments.

Fast maximum aperture of f/1.4 allows fast shutter speeds for clear low-light imaging and shallow depth of field focus.
A Hyper Sonic Autofocus Motor (HSM) offers fast, smooth and quiet autofocus.
Compatible with the Sigma USB Dock which enables firmware updates and focusing adjustments.