For solo jet displays, I am mostly at 600 or 840 (with TC), so the prime is perfect (for me). For team displays or heavies, I have the 100-400 if I need it, which is less restrictive than the 180-600 at the wide end.I shoot air shows, too. I can't imagine using a fixed prime, way too inflexible. My 180-600 is perfect for most shows on my Z 8 and Z 9.. Also, the weight and size difference is not to be underestimated - when hand holding the lens for hours (I shoot air shows), the lighter weight of the 600 PF will be appreciated.
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