Canon EF 70-200 mm f/4L USM review - Image resolution

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Canon EF 70-200 mm f/4L USM

22 September 2007

Arkadiusz Olech

4. Image resolution

The L-grade lenses are known for their very good picture resolution. The tested 70-200 is no exception. Although its flawless results, compared with the best fix focal length lenses are noted only at 135-200 mm. At 70 mm we noticed a small decrease in the resolution results – by 10-15% – in relation to the lens’s maximum results. Well, even among L-grade lenses, zoom lenses are ruled by their own laws -if there is better in some place, then it must be worse in the other.

Canon EF 70-200 mm f/4L USM - Image resolution

At the edges of the frame the situation isn’t that fantastic as it is in the center. If we compare it with fixed lenses of 50 mm or 85 mm, the tested lens is significantly weaker. But if we compare it to some other zooms, the 70-200 mm has much better results. In the whole focal length range the lens’s performance is very even but the lens’s results are weaker, at many focal lengths, than our agreed level of 30lpmm as being good.

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A comparison of the best and the weakest L-grade lens results in the middle of the frame are shown in the test table clippings. I would like to remind you that these are only JPGs, which we are using to show our viewers the results. The real resolution results presented in the charts above were achieved by analyzing the RAW files.