Quote:
Originally Posted by Jose
No argument here but the cropping magnifies the images; same effect as the use of an extender (optical v.s. digital). And the issue if not one of coverage; it is one of exposure...as shown in the images presented, when the lens is set at 35 mm and the flash head as 35 mm, the image is underexposed compared as to when the lens is at 35 mm and the flash head is at 50mm (note that illumnation across the image is even at both the 35 and 50 mm flash zoom settings). My point is that the Flash should automatically set the zoom to 50 mm rather than 35 mm since in the Canon 40D the 1.6X sensor makes a 35 mm a virtual 50 mm.
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You are confused. Cropping magnifies nothing, and is nothing similar to a teleconverter. The reason the image is underexposed in the first example has nothing to do with the zoom range selected, but is a byproduct of ETTL metering. It is well known that Canon's flash system underexposes consistently by about 2/3 stop. If you look closer at the second image, the center is slightly brighter, due to the narrower beam produced by selecting a longer zoom setting. The image is still underexposed.