I am on the verge of buying the Sigma 2x TC to compliment my 120-300mm 2.8. Does anyone have any experience with this setup? Is IQ acceptable? Any sample photos?
Thanks
I haven't used this set up myself, but I understand that the 2x TC can degrade the IQ quite a lot. I do use a 1.4x TC on the Sigma 300 f2.8 prime and the IQ is fine.
well the thing is that the difference between 300mm and 420mm doesn't justify the cost for me, compared to the difference between 300 and 600. I came across this article which, even though in japanese, it has lots of full resolution photos, from different cameras and with both TCs. It does look softer, but more than acceptable at f/8 and above with a 2x TC. I would just like to know from people who use teleconvertors how they find it.
I think I will eventually end up with both, but for now I think I'll go for the 2x.
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