Help with New Lens..
Hi all. I am after getting a new lens to capture shots from different angles at KSA and other airports when I travel. At the moment I have the Canon F2.8L 70-200mm Lens. I was looking about the 400mm range. I went all out when I bought the canon lens and would find it hard to afford a long range Canon lens. Does anyone use Sigma lenses. I notice they are quite a bit cheaper and have various ranges eg 50-500mm, 120-500 and 150-500 if my memory serves me right.
If anyone uses these, how do you find its uses for aviation at the maximum zoom. I read the images can become quite blury when shooting wildlife at 500mm. Any help will be much appreciated on the Sigmas or any other ideas.
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