Thanks Bill. Yes, I try to keep the whole focal range with me, without having to change lenses. I would rather use my 5d2 and 5d3, but this great little Sigma, the 18-250 is an EF-S lens. The closest equivalent full frame lens is a monster Canon 28-300L, that has too much overlap with several other lenses I have. For trains, the APS-c and Siggy are a good enought combo, as long as I keep it stopped down to about f8.Nice shots. I have found the 5DIII/telephoto zoom + 7D/wide angle zoom is a very convenient combo to carry where you may be photographing both birds and trains.
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