Oxford School of Photography

insights into photography

Why Lens Speed Varies or why does my lens have different apertures at different zoom lengths

In class when teaching Understanding Your Digital SLR camera I am often asked why does the zoom lens I bought with my camera say f3.5-f5.6 and why does it vary when I zoom. There is a simple explanation to this but this answer on the digitalphotography lifetips site says it all so if you want to know have a look here

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