Silkypix exif data question.

Just checked my Sigma results in PhotoME

Sigma 18-50 DC reports as Sigma 18-50DC, 12-24 EX, 17-70 f2.8-4.0 or Tamron 35-90 f4.0
Sigma 55-200 DC reports as Sigma 55-200 DC, Pentax SMC-F 35-105 or a Sigma 28-300
Sigma 100-300 EX reports as Sigma 70-200 EX or 100-300 EX
Sigma 10-20 DG reports as Sigma 10-20 DG or 12-24 EX

Similar results in IDimager.

SilkyPix Pro reports the following:

Sigma 10-20 DG as a Sigma 18-50 DC
Sigma 18-50 DC reports correctly
Sigma 55-200 DC as a Pentax F 35-105
Sigma 100-300 EX as a 70-200 EX

Sigma are not alone, my Tokina 80-400 ATX II reported as a Sigma 70-200 EX and my Tokina 80-200 f2.8 ATXPro as a Pentax 35-105 or a Sigma 70-200 EX and my Tokina 20-35 f3.5-4.5 as a Pentax F 35-70

The few Tamron lenses I've had seem to be okay, as do sample shots from some Canon and Nikon lenses.

It seems probable that the main makers lenses report correctly, but there are some considerable discrepancies with some Sigmas and also some of the earlier Tokinas. There is also some variation between PhotoME, IDI and SilkyPix, but at least they do, in general, agree on one or two of the multiple choices.

Looks like a lottery to me unless you stick with the camera makers lenses.

EDIT - All the software versions are up to date.

Just a thought Richard - it might be worth contacting Photome especially if you can give them the lens ident strings from your exifs.