condyk wrote in post #2255131
Yup,l those lucky shooters are all over the Internet. I dunno how our Aussie shooter buddy Wayne gets any of his shots. Lucky guy too eh? Note the use of the term 'shooter', i.e. someone skilled in the craft of photography.
Why do you want IS when you are shooting almost exclusively from a beanbag in a vehicle on safari? Context son ... so important. Fit for purpose not fit for bragging. Sure the 100-400mm will do the job ... to 400mm

and if you want a lb of Namibian dust crudding uop your sensor

Good on a hot day tho' that pump action will keep us all cool

Laddie, let's try to be less coloquial and more analytical.
Talking about the Birdman from Oz is akin to addressing an exception that asserts the rule.
First and foremost, all of his bigmah shots which I remember were taken in bright Ausie sun. Sari may not have that luxury during her trip, decidedly much less so upon her return.
Second, he appears to be well physically suited to handling a very heavy lens...besides he's been perfecting that skill for a long time. Also, it may well be that the lad owns a sharper than usual lens copy.
Shooting exclusively from a beanbag ? I'd say that should limit the lens utility/versatility as well, compared to an IS lens.
Lastly, if upon extension the bigmah does not take air from the ambient directly, where else does she suck it from ? The camera ? Perhaps you are implying that Sigma makes such superior US military grade seals that the bigma just holds vacum.....like a vehicle shock absorber ?..Or perhaps that she is provisioned with singularly effective dust filtration seals ? Not likely, I say.