Both have same lens construction, three ED elements.
http://asia.olympus-global.com/imsg/dslr/lenses/70-300_40-56/
C.H.Ling
----- Original Message -----
From: "Ton Maas" <tonmaas@xxxxxxxxx>
>
> Yes, it was obviously borrowed from Sigma, but the Oly website suggests
> it has been modified (more ED elements) to meet Oly standards. Anyone has
> more info on that?
>
> Ton
>
>
>> The DZ70-300 looks like borrowed the glasses from Sigma:
>>
>> http://www.sigmaphoto.com/lenses/lenses_all_details.asp?id=3303&navigator=3
>>
>> Based on photozone's review, its performance is not that impressive:
>>
>> http://www.photozone.de/Reviews/Canon%20EOS%20Lens%20Tests/326-sigma-af-70-300mm-f4-56-apo-dg-macro-test-report--review?start=1
>>
>> Just like the DZ18-180, it has the same optical design from Sigma 18-200,
>> I
>> was hopping the Olympus version better but I was wrong, the edge
>> performance
>> drop at 35mm and overall drop at 180mm disappointed me.
>>
>> C.H.Ling
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