[Klaus]

The Tokina is half the weight and length of the Sigma lens ...
As much as I like Sigma lenses these days - regarding its "extension tube" it's quite pathetic really.

My point was: an unjustified price for a 3rd party lens in today's pricing landscape.

And about the size and weight... Of course it is, that is the norm anyway with lenses that are a stop faster

And on the tube... It is not an extension tube (lens does not focus closer), but rather a mirrorbox-replacement-sans-mirror, or integrated adapter.

Make a guess why I put the "extension tube" in quotation marks ... ;-)