I didn't have a Sigma 100-300mm I could borrow for the comparision, but here is the Sigma 170-500. Btw the Sigma appears to have a lens hood attached, but that is not the case, it is actually a conical housing for the front elements.
You are viewing a single comment's thread from:
I think the 170-500 and the 100-300 should very similar in size an weight. Both nearly 1.5kg, more than 9cm diameter and more than 20cm in length.
I would have thought at first that this is a lens hood. I also saw the glass in it on pictures on the web.