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Just a little thought;
Sigma's 2*Teleconverter is in fact closer to a 1.95 teleconverter no full 2*TC (something you only notice when compared side by side with another 2*TC)
Several of sigma's 500mm zoom lenses (eg 150-500mm) are often reported as being closer to 450mm instead of the full 500mm
Tamrons 90mm f2.8 macro lens is in apparently really an f3 lens
Those are 3 such cases I've heard/encountered, but I'm curious as to other examples; and not just from 3rd party as I'm sure if they are "getting away" with such then the "big boys" on the field (eg canon and nikon) are probably using similar title and marketing tactics.
This is purely out of interest I'm not trying at all to say anything about the quality or reliability of 3rd party or 1st party gear (got 2 great 3rdparty lenses and I'd only swap one to upgrade it to the OS version).
Sigma's 2*Teleconverter is in fact closer to a 1.95 teleconverter no full 2*TC (something you only notice when compared side by side with another 2*TC)
Several of sigma's 500mm zoom lenses (eg 150-500mm) are often reported as being closer to 450mm instead of the full 500mm
Tamrons 90mm f2.8 macro lens is in apparently really an f3 lens
Those are 3 such cases I've heard/encountered, but I'm curious as to other examples; and not just from 3rd party as I'm sure if they are "getting away" with such then the "big boys" on the field (eg canon and nikon) are probably using similar title and marketing tactics.
This is purely out of interest I'm not trying at all to say anything about the quality or reliability of 3rd party or 1st party gear (got 2 great 3rdparty lenses and I'd only swap one to upgrade it to the OS version).