Originally Posted by
Tannin
There is no point in buying a 2X TC for an f/4 lens. Just a waste of money. A 1.4 is certainly handy though. Is the difference between the Mark II and the Mark III likely to be significant? Good question!
As for justifing the Wimberley, there is no need. If you are eying off a Wimberley because you think it will be the best head around, or perhaps just because you think that there are several good ones and this is one amongst them, don't bother. Honestly. Nope, I recommend that you buy the cheapest head you can lay your hands on - but be sure that you do the calculations correctly, including all the costs. A Wimberly sets you back about $600 plus freight. But there are a number of heads that you can buy for as liittle as $100, plus some better ones around the $350 mark. So you can buy a Wimberley for $600, or you can buy a $100 head, stuff around with it, throw it away and get the better quality $350 one, use that for a while until you realise that it is wrecking too many shots and throw that one away too and get a Wimberley. $600 is less than $100 + $350 + $600 = $1050. Save money, just buy the Wimberley.