Thanks for the info, Markulous,
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Don't forget there're 2 x Sigma 50-500s now: the original Bigma and the newer OS version - the OS version is very well rated and would appear to outperform the 150-500
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I could only find the one Sigma 50-500 on the WEX site (Sigma 50-500mm f4.5-6.3 DG OS HSM - Canon Fit), so I assume this is the newer of the two you mentioned. This is the one with only 2 reviews (both good), that I linked to in my post.
At the moment, I've got a Canon EF-S 18-200mm f3.5-5.6 IS Lens, and was thinking about replacing it (when and if funds allow). Your information about the the Kenko Pro 300 looked really interesting, but I think I'm snookered by this statement from Kenko (especially the last two sentences), but it might still be suitable for the OP:
"The PRO 300 family is designed specifically to be used with prime telephoto lenses of 100mm or above, such as, a 300 mm f/2.8 lens, and work best with telephoto lenses of 200mm to 500mm. The PRO 300 can be used with telephoto zoom lenses as well as prime lenses. However, Kenko does not recommend them for zoom lenses that have a range starting under 50 mm.
Please note: Kenko teleconverters are not compatible with Canon EF-S lenses."
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Be aware that adding a TC which makes the aperture of the lens f/8 (like on a 100-400 @ f/5.6) will prevent AF on most Canon cameras (unless you use the pin tape trick)
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What's the pin tape trick?
I guess, ultimately, as others have already said. I've got to save up, then go and have a play with both the Sigma and Canon lenses to feel what they are like to handle and use.
Apologies for the hijacking of this thread. Hopefully, the OP will find it interesting, as we both seem to be looking for a similar solution. And thanks once again to Markulous, for the information and comparisons, very useful.
Cheers
Nick