Roy C
Occasional bird snapper
Jim, I can understand anyone with a Sigma 150-500 wanting to upgrade to the Tammy that for sure (one that I tried was soft as soap at the long end and at normal shooting distances was not a lot longer than the 400/5.6). There will always be exception but I still say that in the main anyone with a nice big white super tele will not be rushing out to buy this lens - If its a case of wanting something smaller for walking around then I would much sooner have a used Canon 300/2.8 IS MkI myself - not a lot heavier than the Tammy, awesome at 300mm, you lose very little at 420mm and useable at 600mm.Well I've got a 500mm f4L and I've ordered the tamron to replace my Sigma 150-500mm zoom. The big prime is great, but if i'm going out all day and walking around, I prefer the lighter zoom. The Sigma was my first long lens and I've been waiting for an update of the 100-400mm to replace it but Canon just waited too long.
At the end of the day Jim, you are obvious happy about the big hit you take between your existing Siggy and the 500/4 and that's fair enough but I would suspect that the majority of 500/4 users would not entertain it.
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