- EF 28-200mm f / 3.5-5.6 USM
- EF 28-200mm f / 3.5-5.6
- EF-S 18-200mm f / 3.5-5.6 IS
The processing of the panel is, as usual Canon quality. She is tight and firmly on the lens and by the velvety black coating on the inside, all blend influences are avoided on the lens.
Likewise avoided black vignettes on the edges of images - just in the range of 18-24mm. An advantage of this tulip shape over the "yogurt cup shape" other aperture. In addition, the panel does not rotate when zooming, so they always static sitting on the lens - at least with my 18-200mm.
What else is there to say? The panel has also done good service in rainy weather. Quote at least in the drizzle could well discourage the drops of the lens.
Conclusion: High-quality diaphragm for beautiful pictures in almost any weather conditions.