Paul Colley

This is a big lens, but the performance is well worth it. I do not wish to repeat what other reviewers have already said (and I agree with most of it), but simply add a tip for saving the additional expenditure, space and weight of an additional port. Rather than buy the dedicated lens port (I use a D300 and Subal housing), I use a combination of the 60mm port and an additional spacer (I already had both for other lens and port configurations - many people will have the 60mm port already, I am sure). Although you lose the ability to focus manually, the lens is so good in autofocus - especially if you use a modelling torch for very low light or low contrast conditions - the lens works perfectly well without the dedicated 105 port. If you need to fix the focus range to avoid hunting, you can simply find the correct range in autofocus, set the camera body to manual focus and then shoot at that fixed range. Although I have found a couple of occasions where manual focus via the lens might have been easier, the savings (cost, weight, space) seem more than worth the trade-off.

A hugely informative article, Keri (which answered all the questions that I had about the subject). Thank you.