Difference between a Sigma DG and non DG lens?

[wanzw]

checked the website. this is what sigma states for their DG

DG (DG Lens)
These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs.

what does it exactly mean? how come the same lens 70-300 f4-5.6, has the same apeture but one with DG and non DG?

[Stratix]

Originally Posted by wanzw checked the website. this is what sigma states for their DG DG (DG Lens) These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs. what does it exactly mean? how come the same lens 70-300 f4-5.6, has the same apeture but one with DG and non DG?

DG lenses are newer, this having 100% no problem with DSLRs. some non DG lens might not work DSLRs, giving Err99 errors due to incompatible chipping on the lens.

[wanzw]

hi there, thanks for your reply. optically wise, there is no difference between a DG and non DG?

thanks!

[Stratix]

Originally Posted by wanzw hi there, thanks for your reply. optically wise, there is no difference between a DG and non DG? thanks!

yeap. no difference. i personally use a 70-300 Sigma non DG lens on my 300D and it worked like charm. =)

[wanzw]

kewl. thanks for clearing my doubts here.

cheers

[satay16]

i thought non-DG dun have that coating the DG has?

[hazta]

Originally Posted by satay16 i thought non-DG dun have that coating the DG has?

Think u got mixed up w 'EX'

[satay16]

Originally Posted by hazta Think u got mixed up w 'EX'

nonono.........me refering to inner coating on the rear elements. remembered about something like DG have that coating and non-DG dun have.

[metallilan]

I did a google and i came up with this : http://www.photo.net/bboard/q-and-a-...?msg_id=00Gyfj

I think one point mentioned came from the last reply at the bottom:

Quote: As I pointed out the DG versions of many of the lenses have identical optical formulae. I suspect that the only change is in the lens coatings , the markings, and the marketing. These lenses all feature upgradable firmware so if the DG lenses ships with newer firmware then the older version can be updated. All in all I would say that for most of the Sigma lenses there is no reason to favour the DG version over the, probably otherwise identical, non-DG version. I know some working pros (event and stock not "fine art") whose kits are based around Sigma lenses

[wanzw]

well i guess i will just scout for a non DG ver and hope it works on my 400D.

[metallilan]

Originally Posted by wanzw well i guess i will just scout for a non DG ver and hope it works on my 400D.

I have a friend who's using the DG version on his D50, but i'm using the non-DG on my D70..works fine...

[ExplorerZ]

Originally Posted by hazta Think u got mixed up w 'EX'

DG is a special coating formulated for sensor (not film). as for EX, it is actually the higher end series just like tokina having its 'pro' series. i guess the coating you are talking about is on the other part.

more info can be found here http://www.sigmaphoto.com/lenses/lenses.asp

[jaix]

Originally Posted by wanzw well i guess i will just scout for a non DG ver and hope it works on my 400D.

I have the Sigma 70-300 DG and it works fine on my 350D.