Sigma 100-300 DG?!

[jamundj]

I'm considering buying a Sigma 100-300mm F/4 EX IF HSM APO but I know it is also in a DG version. I know this means that it is optimized for digital cameras, but what does this actually mean?! The specs seem to be exactly the same, but the DG costs about 1/3 more! Can anybody help me on deciding what to buy?! It will be mounted on a Canon 350D...

Jonas

 

[DocFrankenstein]

The DG supposedly has low-reflection coatings on the back elements to prevent the light bouncing from the sensor, to the element and back, thus creating haloes

Film doesn't have this problem because it absorbs light better than the sensor.

It might be just a marketing trick, since there's tons of lenses from film days which work perfectly fine.