Canon EF 70-300mm f/4-5.6 IS II USM Review

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  • Excellent sharpness
  • Low CA, especially centrally
  • Well controlled distortion
  • Low flare
  • Well priced
  • Fast and precise AF
  • Effective IS
  • No weather sealing
  • No hood supplied as standard

Canon Ef 70 300mm Is II Usm Front Oblique View

Here we have Canon’s new, updated version of their moderately priced 70-300mm full frame lens. It offers improved AF, improved optical quality and a new electronic display. We coupled this to the Canon EOS 5DS Rbody, so let’s see how the lens performs and handles.

Handling and Features

Canon Ef 70 300mm Is II Usm On 5d Sr At 70mm

70-300mm is a very useful telephoto range, versatile, fairly compact and offering an excellent balance between performance and cost. The step up to 400mm would add a fair amount of cost as well as increasing the size of a lens significantly. The Canon 70-300mm f/4-5.6 IS II USM lens is not the smallest such optic, but balances well on the Canon EOS 5DS R camera body and weighs in at a reasonable 710g.

Starting at the front element, we have a 67mm filter thread, surrounded by a bayonet fit for the ET-74B lens hood that is not provided as standard but has to be bought as an additional accessory. It could be argued that most marques provide the dedicated hood with such lenses, and really Canon should do the same. As a separate item, the hood costs an eye-watering £79.99/$120. Most users will no doubt look to third party hoods that can cost considerably less.

Immediately behind this, the manual focus ring is electronic in operation. It also allows for manual tweaks to the focusing position when using the AF system. AF uses a nano USM motor, which is fast, silent and utterly efficient in locking onto the focus point.

The zoom ring is wide, well ribbed and clearly marked with a range of focal lengths. This can be used in the usual way, but the barrel can also be pushed and pulled at the front to change the focal length. There seems to be no major advantage to doing so, although it is just possible that it might assist in video making to make a smoother zoom action.

Closest to the lens mount, we have a series of switches. On the right, there is a lock switch and this can be used to secure the lens at 70mm, to prevent it extending whilst being carried. On the left, we have the Stabiliser on/off, the AF/MF and a mode switch.

General Article Images

Electronic Display 1 

Electronic Display 2

Electronic Display 3

The mode switch selects the display on the electronic panel. An electronic display of the focusing distance is quite useful as there is no indication on the lens barrel itself. Also on this display is a depth of field indicator that changes as the lens is zoomed. This latter function is not very useful as only f/8 and f/22 appear and the scale is just too small. The second option is a display of focal length set, but again it is of doubtful relevance as the figures are etched very clearly on the lens barrel, right next to the display. Finally, an indicator can show the amount of shake in two directions, but as we are looking either through the viewfinder or at the back screen, having such a display does not really help at all. If the display were not there, the lens would be no less useful and no less easy to operate.

The optical construction consists of 17 elements in 12 groups. There is one UD (Ultra-Low Dispersion) glass element. Focusing is down to 1.2m, giving a maximum magnification at 300mm of 0.25x, or 1:4. The diaphragm consists of 9 rounded blades in a bid to improve bokeh, the quality of the out of focus areas in an image.

Handling of the lens is superb, all the controls working smoothly and everything is ergonomically well designed. Finish is also superb and the overall feel gives a high degree of confidence.

Canon Ef 70 300mm Is II Usm Rear Oblique View


The resolution graphs reveal a complex performance. Starting at 70mm, centrally sharpness is excellent from f/4 through to f/16, after which it drops away significantly. It is still good at f/22 but soft at f/32. At the edges, performance is good at f/4 and f/5.6, but perks up well to become very good at f/8 to f/16. Edges are fair at f/22 and soft at f/32.

100mm sees excellent central sharpness from f/4.5 to f/8 and it remains very good at f/11 and f/16. Sharpness is still good at f/22, but soft beyond that at f/32. The edges are fair at f/4.5, good at f/5.6 and f/8, very good at f/11 and f/16, fair at f/22 and soft at f/32.

200mm sees excellent sharpness centrally at f/5.6 and f/8, very good at f/11 and f/16, good at f/22 but soft at f/32 and f/45. The edges are excellent at f/5.6 and f/8, very good at f/11 and f/16, good at f/22 and soft at f/32 and f/45.

Sharpness at 300mm is very good centrally at f/5.6 to f/11, good at f/16, only fair at f/22 and soft at f/32 and f/45. The edges are very good from f/5.6 to f/11, good at f/16, fair at f/22 and soft at f/32 and f/45.

Overall, the sharpness can be considered to be very satisfactory and certainly, images are crisp and vibrant. The very small apertures are of course also very soft, but that is to be expected because of diffraction and I suspect not many users employ telephoto zooms at apertures much beyond f/8 anyway.

MTF Charts

How to read our MTF charts

The blue column represents readings from the centre of the picture frame at the various apertures and the green is from the edges.

The scale on the left side is an indication of actual image resolution as LW/PH and is described in detail above. The taller the column, the better the lens performance.

For this review, the lens was tested on a Canon EOS 5DS R using Imatest.

CA (Chromatic Aberration) shows up as colour fringing, and in some circumstances can be clearly seen at the edges. Centrally, the lens is highly corrected at all focal lengths, in fact impressively so. The edges show CA, mostly at either end and less so at middle focal lengths, but in any event, this can be tackled in software and not all subjects will reveal the fringing.

Chromatic Aberration Charts

How to read our CA charts

Chromatic aberration (CA) is the lens’ inability to focus on the sensor or film all colours of visible light at the same point. Severe chromatic aberration gives a noticeable fringing or a halo effect around sharp edges within the picture. It can be cured in software.

Apochromatic lenses have special lens elements (aspheric, extra-low dispersion etc) to minimise the problem, hence they usually cost more.

For this review, the lens was tested on a Canon EOS 5DS R using Imatest.

Distortion is very well controlled for a zoom lens. There is -1.83% barrel distortion at 70mm, visible but not excessively so. Thereafter we move to pincushion distortion, measuring +0.11% at 100mm (near perfect drawing), +1.66% at 200mm and +1.89% at 300mm. For the sort of subjects likely to be shot at the longer lengths, much of the time this may not need correction, but if necessary we can deal with it in software.

Having commented on the lack of a lens hood, the saving grace is that the lens is not susceptible to flare. However, a hood is still desirable, both for extreme lighting conditions and also to help shield the lens against knocks.

Bokeh is very pleasant, aided by the telephoto nature of the lens and also by the rounded diaphragm blades. Lenses have an indefinable “look” that cannot really be measured, but aesthetically speaking the results from this lens really do have that certain something that offers attractive looking images.

The IS (Image Stabilisation) system is claimed to offer 4 stops advantage. Obviously, that will depend on the individual photographer, and that even varies day to day. Taking the “rule of thumb” that would suggest at 300mm a shutter speed of 1/300 second would be needed to avoid camera shake, it was found that sharp images could be reliably obtained at 1/30 second. This is almost exactly the 4 stops claimed.

Sample Photos



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