LensTip.com

Lens review

Canon EF-S 18-135 mm f/3.5-5.6 IS

7 December 2010
Arkadiusz Olech

8. Vignetting

The combination of a wide focal range and wide angle of view never favours the vignetting correction even despite a quite average fastness, which characterizes constructions of this type. The tested Canon surprised us nicely in the previous chapter, perhaps an equally pleasant surprise awaits us in this chapter too? Let’s have a look at the thumbnails below and check it out.

Canon EF-S 18-135 mm f/3.5-5.6 IS - Vignetting


No surprise here. At 18 mm and by f/3.5 the vignetting reaches a high level of 44% (-1.7 EV) and after stopping down to f/4.0 it decreases to 38%. The aberration is still noticeable by f/5.6 where it amounts to 22%. On further stopping down we see some improvement but it is rather slight because by f/8.0 we noticed the vignetting level of 20% and by f/11 it reached the value of 19%.


Please Support Us

The coronavirus crisis has been adversely affecting many businesses and, sad but true, ours is not an exception. Despite that difficult situation we would like to preserve continuity and high quality of publications available on all our websites. Still, we are now aware it might be impossible without additional financial help. That's why we would like to ask all those who visit, read, and care about Optyczne.pl, LensTip.com i Allbinos.com for support - it's enough you send us a small sum of money via PayPal. If a lot people decide to support our websites we think we'll stand a chance and survive next months without any lasting harm. We count on your support and understanding, stay safe and be healthy.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

The situation improves a lot at 35 mm focal length. At the maximum relative aperture the brightness loss in the frame corners gets to 27% (0.92 EV). On stopping down to f/5.6 the vignetting becomes hardly bothersome because it reaches just 16% and by f/8.0 it decreases to an imperceptible level of 10%.

When we lengthen the focal length further, some serious troubles with vignetting are back. At 70 mm and by f/5.6 the light fall-off in the frame corners is 36% (-1.31 EV). Fortunately this aberration decreases very quickly on stopping down, by f/8.0 amounting to 17% and by f/11 -to only 10%.

The results at 135 mm are even a bit worse. At the maximum relative aperture we must cope with the vignetting level of 40% (-1.5 EV) and by f/8.0 its value is still 22%. Only the usage of f/11 and f/16 apertures release us from this problem because the brightness loss in the frame corners amounts there to 13% and 8% respectively.

To sum up in this category the Canon 18-135 mm IS didn’t impress us much. However, to be honest, we didn’t expect to be impressed at all.


Canon EF-S 18-135 mm f/3.5-5.6 IS - Vignetting

Canon EF-S 18-135 mm f/3.5-5.6 IS - Vignetting

Canon EF-S 18-135 mm f/3.5-5.6 IS - Vignetting

Canon EF-S 18-135 mm f/3.5-5.6 IS - Vignetting