New 20mm lens
hi i have just been supprised by my wife who brought me a nikon 20mm 1:28 lens(isnt she great) I would like to know a bit about this lens if anybody can help that would be a step in the right direction. i plan on taking some landscape shots latter and would like to know about best apperture to use ,ie a good starting point.also why is their a switch on the lens to lock it to f 22 (i think) thanks for your help .Kym
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