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Possible Duplicate:
What is the difference between focal length and crop factor?

I was watching a video review of Tamron 70-300 lens where he mentioned that effective Focal length for a full frame sensor at max zoom is 300 but for APSc sensor it will be 480, How is that it differs based on Sensor size ?

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  • \$\begingroup\$ Thanks ! that clears a lot, I didnt know the actual terms so question might have been duplicated. \$\endgroup\$
    – user88975
    Commented Sep 12, 2012 at 16:48

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