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Message: <blockquote data-quote="DaveTaylor" data-source="post: 1208702" data-attributes="member: 4698">I've had a look at Keith's shots and they are very good. I just wonder if a 400mm is enough reach or will I have to resort to a converter. The 100-400mm is already a F5.6 at 400mm so with a converter on I will lose even more light and then shutter speeds will drop. I do recognise the 100-400mm is a cracking lens - I do own a 70-200mm F2.8 L series lens and it is amazing.There is a used 800mm Sigma prime lens for sale at £1,500 and I'm considering this, not the 300-800mm zoom</blockquote>