HELP: Canon EF-S 17-55mm F2.8 USM IS
- Thread starter phantom76
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Welcome.. Heh-heh, every newbie question tends to come with "newbie" account. 
Yes, that is normal. That's prob one reason why some will hesitate and ponder if it's worth to purchase the 17-55mm IS, despite what they hear about its superior optics. The built quality is not on par with L quality. If you turn the zoom ring of the 17-55IS and compare it with other L zooms, such as the 17-40mm L, you will realize what a difference it is. The L zoom's ring turns more smoothly and easily.
Other than that, you will also find vignetting (dark edges on corners) to be common at wide apertures, especially f/2.8. And if you shoot in extremely bright lighting conditions, you might get some flare too.
Despite all these, optics-wise, it's tops.
Yes, that is normal. That's prob one reason why some will hesitate and ponder if it's worth to purchase the 17-55mm IS, despite what they hear about its superior optics. The built quality is not on par with L quality. If you turn the zoom ring of the 17-55IS and compare it with other L zooms, such as the 17-40mm L, you will realize what a difference it is. The L zoom's ring turns more smoothly and easily.
Other than that, you will also find vignetting (dark edges on corners) to be common at wide apertures, especially f/2.8. And if you shoot in extremely bright lighting conditions, you might get some flare too.
Despite all these, optics-wise, it's tops.
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