Canon Firmware Updates For EF 400mm f/2.8L IS III and EF 600mm f/4L IS III Lenses

Canon Firmware Update Canon EF 600mm F/4L IS III

Here are Canon firmware updates for two big white telephoto lenses.

Canon released firmware 1.1.2 for the Canon EF 400mm f/2.8L IS III lens (download) and firmware 1.1.2 for the Canon EF 600mm f/4L IS III lens (download). Both Canon firmware updates deal with the following issues:

Firmware Version 1.1.2 incorporates the following enhancements:

  1. Increases the manual focus speed when the manual focus speed switch is set to 1 or 2.

*The speed when the switch is set to 3 (slowest speed) will be unchanged.

  1. Improves the image stabilization effect during handheld shooting with a slow shutter speed when used with EOS 5D Mark IV, EOS 6D, or EOS R.

*Enables a full-time manual focus function during Servo AF when used with the EOS-1D X Mark II. The lens must be sent to the Factory Service Center in order for this funcion to be enabled.

If the lens’ firmware is already Version 1.1.2, it is not necessary to update the firmware.

The lens’ firmware version can be checked from the camera’s menu.

These are big and heavy professional lenses with a equally big and heavy price:

Canon EF 400mm f/2.8L IS III: B&H Photo | Adorama

Canon EF 600mm f/4L IS III: B&H Photo | Adorama

Canon firmware update Canon EF 400mm f/2.8L IS III

Deal: Canon EF 400mm f/2.8L IS II USM Lens – $7999 (reg. $9999)

Canon EF 400mm

At a glance:

  • EF-Mount Lens/Full-Frame Format
  • Aperture Range: f/2.8 to f/32
  • Two Fluorite Elements
  • Sub Wavelength Coating
  • Ring-Type Ultrasonic Motor AF System
  • Optical Image Stabilizer
  • Power Focus, Focus Limiter, Focus Preset
  • Weather-Sealed Construction
  • Detachable, Rotatable Tripod Collar
  • Rounded 9-Blade Diaphragm

B&H Photo has the Canon EF 400mm f/2.8L IS II USM lens on sale at $7,999. Compare at $9,999. Free shipping, and 4% B&H Rewards.

Canon Patent For 400mm F2.8, 500mm F4 and 600mm F4 Lenses For EOS R Mirrorless System

Canon Patent

Hi Lows Note spotted a Canon patent application (2019-95525, Japan) which describes optical formulas for telephoto lenses for the Canon EOS R full frame mirrorless system.

The optical formulas are for 400mm f2.8, 500mm f4 and 600mm f4 lenses.

Focal length: 392mm
FNo.: 2.90
2ω: 3.16
Image height: 21.64 mm
Lens length: 360.03 mm
Back focus: 31.01 mm

Focal length: 490mm
FNo.: 4.12
2ω: 2.54
Image height: 21.64 mm
Lens length: 412.08 mm
Back focus: 33.39 mm

Focal length: 588mm
FNo.: 4.12
2ω: 2.11
Image height: 21.64 mm
Lens length: 476.08 mm
Back focus: 33.21 mm

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

Hot Deal: Canon EF 400mm f/2.8L IS II $7999 (reg. $9999), EF 600mm f/4L IS II $9499 (reg. $11499)

Ef 400mm

You can save big on two big Canon super telephoto primes at our exclusive partners Adorama and B&H Photo.

Canon EF 400mm f/2.8L IS II on sale at $7,999 (compare at $9,999) at Adorama | B&H Photo

Canon EF 600mm f/4L IS II on sale at $9,499 (compare at $11,499) on sale at Adorama | B&H Photo

More selected and exclusive deals:

Developers Of Canon EF 400mm f/2.8L IS III and EF 600mm f/4L IS III Lenses Interviewed

Canon EF 400mm

Canon posted an interview with the engineers who designed and developed the Canon EF 400mm f/2.8L IS III and Canon EF 600mm f/4L IS III telephoto lenses.

The interview is available as a PDF and you can see it here.

An excerpt:

Interviewer: Please tell me about the background, design policy, and your enthusiasm at the start of development.

Nagao (Development Leader): Pro photography situations require the ability to capture split-second, one-of-a-kind moments in high quality. I accompanied pro photographers as they shot, and I noticed how many times that they were all packed into a tight space while tracking a subject. In order to capture such photo opportunities, I realized just how important it is to have a piece of equipment that feels like a part of you and that can be manipulated with complete ease in such tense shooting situations. We then started research from the question of “what should the pinnacle of next-generation lenses be?” We listened to the opinions of experienced photographers, thinking of how we could provide the best piece of equipment to satisfy such users, and engaged in the development process with the ideal lens in mind, but without being caught up in the framework of the conventional lens. 

Shimada (Product Planning): The foremost product concept was a lightweight design. This means a dramatic sense of lightness that one can feel when holding in the hand, as we achieved with the EF400mm f/2.8L IS III USM and EF600mm f/4L IS III USM. The reason we are committed to a lightweight design is because even though the pro and advanced amateur photographers who use super-telephoto lenses have their own ideals when it comes to specifications and style, they all invariably request a lighter lens. We also took into consideration the common view that simply lighter is not enough — rather, the weight balance when holding the camera is an important factor as a professional tool of the trade. Of course one requirement that absolutely must be met is high image quality. Just how light could we make the lens while achieving high image quality? That was the key point of this project.


Canon EF 400mm f/2.8L IS III Teardown (Lens Rentals)

Canon EF 400mm

Roger Cicala and Aaron Closz of Lens Rentals disassembled the Canon EF 400mm f/2.8L IS III lens, a lens that costs like a used car.

From their conclusion:

The spring-loaded adjustable collar collection is something of a mystery to us and will remain so until we can spend some days doing optical adjustments on one. The use of the same motor as the RF lens is very interesting in several ways. Only some more tear downs will tell us if this is just a superior motor type that Canon is going to use in all electrically focused lenses (I suspect this is probably the case), or just in lenses with a lot of glass in the focusing element (another likely thing).

Canon has really been very quiet about this lens, despite the known changes inside. I had a lot of trouble finding out which elements are fluorite (two of them are, apparently). There has been some talk about improved focusing speed and accuracy, which I assume has something to do with the new electronic focus system, but not much.

The teardown is explained step by step with a lot of pictures, see it here.

All images © lensrentals.com and used with permission.

Canon EF 400mm f/2.8L IS III at a glance:

  • EF-Mount Lens/Full-Frame Format
  • Aperture Range: f/2.8 to f/32
  • Super UD and Fluorite Elements
  • Super Spectra and Air Sphere Coatings
  • Ring-Type Ultrasonic Motor AF System
  • Customizable Electronic Focusing Ring
  • Optical Image Stabilizer
  • Weather-Sealed Design, Fluorine Coating
  • Detachable, Rotatable Tripod Collar
  • Rounded 9-Blade Diaphragm

Canon EF 400mm f/2.8L IS III: Amazon USA, Amazon CA, B&H Photo, Adorama, Digitalrev, KEH Camera, eBay US, Canon USA, Canon CA, BestBuy