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: Alternatively I could get a shorter bigger aperture zoom up to 200 or 250mm and add a 1.4 or 2X extender.
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Hi Jekyll59,
The Canon 1.4x and 2x extenders will only work with L series telephoto or telephoto zoom lenses, so if going this route, be careful which lens you buy. See
here for a compatibility chart. I think you also lose a couple of stops, so they are only useful in good light conditions.
Looking at the reviews of the lenses, already mentioned by others, on the Warehouse Express site (WEX): The Sigma 150-500 seems to get fairly mixed
reviews, from 14 reviewers, the Sigma 50-500 only has a couple of
reviews, so is difficult to judge, the Canon 100-400 seems to be generally liked by all 26
reviewers, it's also on the extender compatibility chart, if you did want to go even longer!!
Now, I just need to start saving. A shame we've got a hosepipe ban, else I might be tempted to go and do some car washing to make some extra money.
Regards
Nick