FWIW - my SIgma 70-200 f2.8 reports simply "SIgma Lens" in the exif
"lens info" and "lens model" fields as shown on flickr. The Tokina ATX
400mm f5.6 displays SMC F 35-70 f3.5-4.5 in these fields, but the focal
lens is recorded as 400mm. By contrast genuine Pentax lenses show the
specific model number.
On 6/14/2016 4:28 PM, Igor PDML-StR wrote:
I remember hearing the legend that in era of film SLRs, Sigma did not
purchase the information on the K-mounts AF interface from Pentax and
was reverse-engineering it for the purpose of their (Sigma's) K-mount
lenses.
I don't know if that was fully correct or an urban legend.
I am guessing you, Alex, might be referring to that here.
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