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Hi powered zooms are a compromise of power vs quality. At the edges of the zoom range you start to get all sorts of quality problems and the higher the power the worse they get. Plus a high zoom will cause loads of camera shake, even if the cam is mounted on a tripod.
IMO the expensive cams keep the zoom smaller so the quality isn't lost too much, and the cheaper cams have large zooms as it is often the feature list that sells the budget/lower cost models rather than quality.
Mark.
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Lexicon MC-8B. L/C/R: Blue Sky 6.5's, SL/SR/SBL/SBR: Blue Sky 5's, Sub: Velodyne DD-15
Panasonic NV-HS830, VTX-D800U via TiVo, Arcam DV29 & Sony BDP-S500 > Lumagen VisionHDP > Panasonic TH-46PZ85B. Marantz RC9200
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