Sigma 1.4 converter
I wasn't impressed with mine on the Bigma but it's very good with the 100-300mm f4 and non HSM 70-200mm f2.8.
Still deciding which is the best combination when I need around the 250mm mark!
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6378 posts
20 years
Leeds,
UK
I'll be honest and say the IQ isn't good enough for me when using it with the Bigma, despite been listed as compatable, although I have to admit I always used it handheld. I would imagine it would be OK on the shorter focal lengths.
List of compatable lenses linkscroll down for Pentax.
Virtually mint with original caps and case.
Prefer Bank transfer.
My PPG link
My Flckr link