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Am I also correct in assuming the Optical zoom in a camera is achived using adjustable barlow lense? It seems that at 0 mag I can use F2.8-F4.1 but at 4x my lowest F is 4.1-F8. From this I guess there is a second element controlling the zoom?
If this is off topic Mods could you cut this out and start a new thread. I think the information Dennis posted is very usefull. I would like to see more of this discussion. Maybe we can get Dennis to right a Camera 101.
Regards
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