Sigma 50 1.4 and 50-150 2.8 have same Lens ID????

Started Sep 19, 2012 | Discussions thread
EinsteinsGhost
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Re: Exif 2.3
In reply to Zamac, Sep 21, 2012

Zamac wrote:

With Exif 2.3 my new Sigma 30mm F2.8 is reported as E 30mm F2.8 and not as 30 mm F2.8 Macro (the Sony) while my older Tamron is reported as 100mm F2.8 Macro in place of 90mm.

Minolta 100mm f/2.8 Macro has a LensID of 2581. Tamron 90mm f/2.8 is also chipped with the same information (Lens ID 2581). And since maximum aperture is identical, the description defaults to the Minolta. In fact, there are many other lenses that use the same Lens ID:
Sigma AF 90mm F2.8 Macro
Sigma AF 105mm F2.8 EX [DG] Macro
Sigma 180mm F5.6 Macro
Sigma 180mm F3.5 EX DG Macro

Of these, I suspect that the first two will also show up as “100mm f/2.8 macro” but the last two should be identified properly (as they have unique maximum apertures). And all of these are macro lenses, so another field used to identify that characteristics of the lens, will be set similarly for all of them.

The "E" with your Sigma 30mm f/2.8 comes out of another field on the EXIF: Lens Spec. There could be several reasons why 30mm f/2.8 is not confused with the 30mm f/2.8 (A-mount) or 30mm f/3.5 macro (E-mount).

  • Lens Spec value of "E" plays a role. This itself would help differentiate from 30mm f/2.8 for A-mount.

  • Maximum aperture is different from 30mm f/3.5 macro, as well as the macro lens identifier in the EXIF would be set as macro for the Sony 30mm f/3.5 but not for the Sigma.

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