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I have the Sigma 70-300 APO DG (1:4-5.6) Telephoto Zoom and love it to death. I've been able to catch some awesome shots, especially the moon, with it.Just out of curiosity, is this a good lens and would it be worth getting? Sigma 150-500mm f/5-6.3 AF APO DG OS HSM Telephoto Zoom Lens for Canon Digital SLR Cameras. Am I moving too fast or just stick with the lenses I have, up to the 300.