(For some reason it says I'm not logged on to post a comment under the Article but I did the requested Forum password reset and can post here...)
One thing to note about the Dock is it can be useful if you get a Sigma EF Lens to adapt to RF.
This can be a good idea as some are very reasonably priced, for example I see the EF 50mm f/1.4 Art can be had for £409 used in excellent condition (which is a larger but interesting alternative to the slightly more expensive 45/1.2 and its "classic" rendering):
However I have found (with my bought-new back-in-the-day) 50 Art that the RF IBIS doesn't work (at least on my R5ii) if the lens is set to Full Time Manual Focusing in its options, which you need a Dock to change. I should point out that when I found IBIS wasn't working I asked Sigma, and a little later they told me the answer, any connection between the two was not even vaguely obvious.
I bought my EF Dock used as it's a simple does-it-work question rather than a lens where you might want to check it a bit more... Though I notice MPB say it's out of Stock so used availability might be an issue, as people buy them if they have a suitable lens and presumably would either keep them or sell them with their last Sigma EF lens...
One thing to note about the Dock is it can be useful if you get a Sigma EF Lens to adapt to RF.
This can be a good idea as some are very reasonably priced, for example I see the EF 50mm f/1.4 Art can be had for £409 used in excellent condition (which is a larger but interesting alternative to the slightly more expensive 45/1.2 and its "classic" rendering):
However I have found (with my bought-new back-in-the-day) 50 Art that the RF IBIS doesn't work (at least on my R5ii) if the lens is set to Full Time Manual Focusing in its options, which you need a Dock to change. I should point out that when I found IBIS wasn't working I asked Sigma, and a little later they told me the answer, any connection between the two was not even vaguely obvious.
I bought my EF Dock used as it's a simple does-it-work question rather than a lens where you might want to check it a bit more... Though I notice MPB say it's out of Stock so used availability might be an issue, as people buy them if they have a suitable lens and presumably would either keep them or sell them with their last Sigma EF lens...