06-23-2015, 03:01 PM
Magnesium is no better shield against high frequency - and in front of the plastic body is a metal bayonet. Also, the mirror box is not only plastic?
If I look at this explosion drawing, I see at least two parts potentially made of some cast or sheet metal, which are in between the sensor and the radiating HS drive of the Tamron - this could be enough to prevent banding.
![[Image: exploded.jpg]](http://www.dpreview.com/reviews/CanonEOS550D/images/exploded.jpg)
If I look at this explosion drawing, I see at least two parts potentially made of some cast or sheet metal, which are in between the sensor and the radiating HS drive of the Tamron - this could be enough to prevent banding.