Canon Working On An RF 8-15mm f/4 Fish-eye Zoom Lens, Patent Suggests


A new Canon patent application suggests the company might have an interesting lens for the EOS R ecosystem up their sleeve.

Hi Lows Note spotted Canon patent application 2020-166234A (Japan), where optical formulas for an RF 8-15mm f/4 fish-eye lens are discussed. The lens seems to be pretty much the mirrorless counterpart to the EF 8-15mm f/4 fish-eye.

  • Zoom ratio: 1.85
  • Focal length: 8.10 12.51 15.01 mm
  • F number: 4.10 4.10 4.10
  • Half angle of view: 90.14 90.45 90.39
  • Image height: 11.50 18.00 21.60 mm
  • Lens length: 123.74 111.21 109.67 mm
  • Back focus: 11.78 20.27 24.66 mm

We think it’s very likely this lens will hit the market, sooner or later. Btw, it’s not the first patent for a fish-eye lens for EOS R.

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Canon Patent For RF 8mm f/4 Circular Fisheye Lens For EOS R System

Circular Fisheye

So many Canon patents for RF mount lenses. Here is another one, and it’s for a circular fisheye lens.

Canon patent application 2020-56995 (Japan) discusses the optical formula for an RF 8mm f/1.4 circular fisheye lens for the Canon EOS R full frame mirrorless camera system.

  • Focal length: 8.10 mm
  • F number: 4.00
  • Half angle of view: 90.84
  • Image height: 11.50 mm
  • Lens length: 66.13 mm
  • Back focus: 13.21 mm

This might be a patent that gets into production sooner or later. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Laowa 4mm f/2.8 Fisheye Lens For EOS M Announced

Laowa 4mm F/2.8 Fisheye

The Laowa 4mm f/2.8 Fisheye lens as launched back in August 2019 for the MFT system.

Now Venus Optics announced the Laowa 4mm f/2.8 Fisheye for three more mount types, Canon EF-M (EOS M), Sony E, Fuji. And the best thing? It sells for $200.


Laowa 4mm F2.8 Fisheye 
Focal length4mm
Max aperturef/2.8
Min aperturef/16
Angle of view210°
FormatMicro Four Thirds
MountMicro Four Thirds
Focus typeManual Focus
Lens typeFisheye
Optics7 elements in 6 groups
Aperture blades7
Min focus distance8cm (3.15″)
Dimensions25.5 x 45.2mm

This new lens from Venus Optics has an ultra-wide field of view (210°) and obviously a lot of distortion. It almost sees behind itself, and it can be used or 360° panorama photography.

Laowa 4mm f/2.8 fisheye
Venus Optics 4mm f/2.8 fisheye
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Deal: Lensbaby 5.8mm f/3.5 Circular Fisheye Lens – $159.95 (reg. $299.95, today only)

Lensbaby 5.8mm F/3.5

Only for today (12/11/2019) B&H Photo has the Lensbaby 5.8mm f/3.5 Circular Fisheye Lens (Canon EF mount) on sale at $159.95. Compare at $299.95. Free shipping.

There is more:

More hand-picked deals are listed here.

Authorised Canon retailer B&H Photo has discounted EOS 5D Mark IV and EOS 6D Mark II bundles on offer for the holidays.

We offer 10% discount to subscriptions to Pixpa all-in-one platform for photographers.

Today’s Gold Box and one day only deals at Amazon USAmazon DEAmazon UKB&H Photo, eBayAdorama.

Canon Europe stores have a cash back promotions going on:

Refurbished lenses and DSLRs at Canon Store (best deals to be found here)

Save $10 on Luminar 4 and/or Aurora HDR 2019 using our code “WATCH” at checkout.

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Canon Patent For 8-15mm Fisheye Lens For APS-C Mirrorless

Canon Patent

Canon patent application US20190094490 describes the optical formula for an 8-15mm fisheye lens. Given the back focus distance this is most likely a lens for the EOS M system.

From the patent literature:

In order for a zoom lens to have a wide angle of view and achieve high optical performance across the entire zoom range and the entire object distance range, it is important to appropriately set the elements constituting the zoom lens. For example, it is important to appropriately set the zoom type (the number of lens units and the refractive power of each lens unit), the lens configuration, and the lens unit selected for focusing, and so on. 

If these configurations are not appropriate, achieving a wide angle of view will increase the size of the whole system and also increase the variations of various aberrations caused by zooming and focusing. It will therefore be difficult to achieve high optical performance across the entire zoom range and the entire object distance range. 

For example, for a fisheye zoom lens having an imaging half angle of view of 85 degrees or more, a meniscus lens having an extremely strong negative refractive power needs to be disposed closest to the object side within the first lens unit in order to take light rays into the zoom lens from such a wide angle of view. Generally, lenses in a first lens unit not only have strong refractive powers but also have large effective diameters. Thus, when it comes to a fisheye zoom lens, its first lens unit is heavy and large as well. Then, if the entirety or part of the first lens unit (the closest lens unit to the object side) is used as a focus lens unit, quick focusing will be difficult. 

Source: Canon News

This Prototype Fisheye Lens Can See Behind Itself


Roger Cicala of Lens Rentals is best known for the teardown of lenses and cameras. But Roger Cicala isn’t good just in dismantling lenses, he’s good also in building them.

Together with friends he made a prototype 4.9mm f/3.5 “hyperfisheye” lens.

[the] prototype C-4 Optics 4.9mm f/3.5 circular fisheye [is] a massive lens giving a 270-degree field of view, meant for immersive video and specialty shots. To give you an idea of what 270 degrees means, the lens sees behind itself. An ultra-wide 15mm fisheye lens gives a 180-degree field of view while an 11mm rectilinear lens is less than 120 degrees.

The picture below exemplifies what is said above.

Head over to Lens Rentals to see all steps of the assembly, along with a large set of images. Or just watch the video below.