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Canon RF 400mm f/2.8 L IS USM : Specifications and Opinions

The Canon RF 400mm f/2.8 L IS USM is a supertele lens for FF and APS-C, manufactured from 2021. The focus is done by Ultrasonic AF Motor (Ring-USM), it has image stabilization. The average price, when it has been added to the JuzaPhoto database, is 13000 €;

10 users have given it an average vote of 9.9 out of 10.

MOUNT

This lens is available with the following mounts:

Canon RF: this lens is compatible with mirrorless fullframe and APS-C Canon RF.

Specifications
Focal lenght	400 mm
Angle of view	6.2°
Format	FF, APS-C
Max. aperture	f/2.8
Aperture blades	9
Lenses/Groups	17 elements in 13 groups
Min. focus distance	2.50 meters
Reproduction ratio	0.17x
Features
Stabilization	Yes (built in lens)
Focus	Ultrasonic AF Motor (Ring-USM)
Internal Focus	Yes
Built and notes
Tripod ring	Yes
Extenders	Yes
Filters	52 mm
Lens hood	Yes, supplied
Weather sealing	Yes
Weight	2890 g
Dimensions	168 x 367 mm
Buy
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Reviews

What do you think about this lens?

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The following opinions have been automatically translated with Google Translate.

Mattia Campos

sent on June 24, 2025

Pros: Image quality and pleasantness Extraordinarily light and can also be used handheld.

Cons: Witnessing the vision of the terminal part (attachment) of the lens and touching that "welded" adapter, made of gray metal, even in relief with respect to the surface of the barrel, is a terrifying and gruesome experience worthy of the best horror movie .... To play it down I could quote Henry Fonda in the film "My name is Nobody": "you glitter like the door of a brothel"; ) Consequently among the cons I obviously put the price, well above that of the GM 400 and now equal if not even higher in some situations than the undisputed Sovereign of all 400 2.8, that is the Nikon Z

Opinion: A 400 F2.8 is the Supertele par excellence, the most widespread and sometimes indispensable in the professional field, especially sports. Its focal length combined with its high brightness allow you to work and take home photos in all contexts even when there is no light. This Canon RF also, unlike all the others, has a huge value because it is by far the lightest and can be used freehand. The optical scheme concentrated in the rear close to the camera mount, and its not excessive length (it is 10cm shorter than the 600) help to create a perfect balance during use, especially on the R1, allowing you to shoot even handheld for a long time without feeling fatigue, despite a weight of over 4kg, that seem half of it. Compared to the 600 F4 RF the difference is huge... The 600 after a few minutes makes itself felt heavily and necessarily requires a monopod. Even compared to the Sony 400 GM which can benefit from lighter flagships such as A1 and A9, the difference is obvious, and even compared to the Sony 200-600 zooms and especially the 400-800 and 150-600 this RF 400 is more pleasant to use freehand, despite a much higher weight on paper, which however is not felt. Despite the imposing size inside it seems empty, it is impressive! The only drawback is represented by the bracket which is not ergonomic and above all it is too short and penalizes its transport, in this regard I also recommend replacing it with a Leofoto CF - 05 as recommended by the user Marco50. In terms of selectors, I would have liked the direct presence of the Full time manual focus (as on the 400 GM) which is not present here. Regarding performance: Autofocus: by now the autofocus of zooms such as the 100-500 is so good that being able to instantly notice differences in speed, responsiveness and precision is practically impossible.... any differences may emerge in critical light conditions where an F2.8 sees us better ... Optical quality: many "curious" and many enthusiasts who look at it with admiration, desiring and dreaming of it, might think that its sharpness like that of a 600 F4 can be incredibly high, much more than that of a cheaper telezoom (100-500, 200-600, 150-600 ... etc... ) and that the churned photos are much sharper .... In reality, this is not the case ..... or at least not as much as you can imagine... The sharpness of a 400/600 is about that of a modern and very good Canon 100-500, only slightly higher... difficult to see differences, if not pointing sights and then viewing on the monitor at 100% ... in practice, in the field, you will not see any differences... However, what you will see, quite clearly, will be an overall more pleasant and "alive" image while that of the zooms will be flatter ... The details are taken and reproduced in a clearer and more pleasant way, the subjects appear more embossed, in relief with the background, and the background is obviously cleaner. A characteristic of luminous supercanvases is in fact that they reproduce an intense blur, but at the same time sober, neutral, as well as the colors that are more real and faithful.

Marco50

sent on June 03, 2023

Pros: Weight speed maneuverability

Cons: As always for these lenses the high price

Opinion: I have been using this lens for a few months, I had many doubts to replace my EF 500 f4 ISII that for many years has given me a lot of satisfaction. I spent an interlude of time using a canon EF 400 f4 DO II with which the spark did not go off. My only doubt for this lens were the missing 100 mm that these days always serve, but if I compare the weight and handling I am convinced immediately, I reduced the weight to a minimum using leofoto bracket (recovered from the previous lens) and folding lens coat hood by doing so you can afford to do wandering hunting even at my age. Autofocus speed certainly the fastest I've ever had, with 1.4 you don't notice any difference and with the 2x it's very fast. Quality: remarkable optical yield at 2.8 if I think that I can have an 800 mm f 5.6 using the 2x also considering the fact that the quality suffers, but I do not see all the difference that I have found in other optics. I will continue to use it in various conditions to see more strengths and weaknesses. I continue to trust mom Canon, but considering that parts of the body have already taken my kidneys I need. Surely the positive thing that the used is easily given away and this makes the difference because it sweetens the pill.

Photos taken with Canon RF 400mm f/2.8 L IS USM

Panthera leo

by Stefano Bonfoco
82 comments, 4165 views [editors pick]

HI RES 41.8 MP

The beginning of the adventure

by Bavassano Michele
55 comments, 5873 views

Rusty Hunchback

by Cirillo Giovanni
132 comments, 10033 views [editors pick]

HI RES 14.5 MP

Enchanted gorges

by Bavassano Michele
54 comments, 4616 views

HI RES 32.7 MP

Goshawk

by Marco50
78 comments, 3644 views

HI RES 15.4 MP

Howl on the attack

by Nangi
91 comments, 3795 views

HI RES 6.3 MP

Last rays of light

by Bavassano Michele
23 comments, 4679 views

HI RES 40.7 MP

HOOPOE IN THE MIRROR

by Marco50
79 comments, 2081 views

HI RES 15.4 MP

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Small lynxes

by Marco50
73 comments, 2853 views

HI RES 15.4 MP

Green Season

by Bavassano Michele
28 comments, 9409 views

HI RES 14.8 MP

Wild Cat

by Bavassano Michele
30 comments, 3646 views

HI RES 25.2 MP

Low-level flight

by Nangi
73 comments, 2451 views

HI RES 6.8 MP

PARDINA LYNX

by Marco50
66 comments, 3067 views

HI RES 8.6 MP

Lynx Baby

by Marco50
60 comments, 2150 views

HI RES 8.6 MP

The lion King

by Bavassano Michele
24 comments, 3832 views

Games

by Marco50
51 comments, 1979 views

HI RES 8.6 MP

Clash of black grouses in the storm

by Nangi
68 comments, 3242 views

HI RES 6.8 MP

Sparrowhawk ?

by Marco50
62 comments, 2243 views

HI RES 24.0 MP

Iberian Lynx

by Marco50
60 comments, 1999 views

HI RES 15.4 MP

Goshawk at dawn

by Marco50
72 comments, 2067 views

HI RES 15.4 MP

Ural Owl

by Marco50
62 comments, 2131 views

HI RES 3.8 MP

Sparrowhawk ?

by Marco50
67 comments, 1904 views

HI RES 15.4 MP

King volture

by Bavassano Michele
23 comments, 3560 views

HI RES 12.8 MP

Turtledove in the mirror

by Marco50
62 comments, 1747 views

HI RES 8.6 MP

Kingfisher

by Marco50
64 comments, 2576 views

HI RES 8.6 MP

Unexpected Griffin

by Marco50
63 comments, 1708 views

HI RES 6.0 MP

Goshawk

by Marco50
67 comments, 2285 views

HI RES 15.4 MP

Lince Pardina

by Bavassano Michele
23 comments, 3290 views

Morning Light

by Bavassano Michele
25 comments, 2162 views

Beauty in the bathroom

by Marco50
72 comments, 2110 views

HI RES 6.0 MP

Welcome back Green Woodpecker

by Marco50
60 comments, 1502 views

HI RES 8.6 MP

Yaffle ?

by Marco50
44 comments, 1308 views

HI RES 8.6 MP

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Jay

by Marco50
56 comments, 2093 views

HI RES 15.4 MP

Goshawk at dawn

by Marco50
57 comments, 2116 views

HI RES 15.4 MP

Golden eagle

by Marco50
60 comments, 2235 views

HI RES 3.8 MP

The black fork in the storm

by Nangi
37 comments, 2067 views

HI RES 6.8 MP

Instants of Eternity

by Bavassano Michele
26 comments, 2724 views

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Reviews » Lenses » Lenses Canon » Canon RF 400mm f/2.8 L IS USM

Canon RF 400mm f/2.8 L IS USM : Specifications and Opinions

Buy

Offerte Usato RCE

Reviews

What do you think about this lens?

Photos taken with Canon RF 400mm f/2.8 L IS USM