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Relationship between lens speed and sensor size

Started Oct 8, 2012 | Discussions thread
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Relationship between lens speed and sensor size
Oct 8, 2012

I'm hoping someone can help me understand better to compare cameras and lenses with various sensor sizes and lens speeds.   For example, if looking at the Panasonic FZ200, which has a 2.8 lens throughout its full zoom range but uses a small P&S sensor, how can I (or can I?) compare that at a 300mm length (35mm equivalent) against a camera that uses a micro 4/3 sensor or APS-C sensor using a similar length zoom lens that at the long end is at 6.3?

I hope my question makes some sense.

Thanks in advance.

 Larry251's gear list:Larry251's gear list
Sony Alpha NEX-6 Sony a6000 Sony E 16mm F2.8 Pancake Sony E 55-210mm F4.5-6.3 OSS Sony E 16-50mm F3.5-5.6 PZ OSS +3 more
Panasonic Lumix DMC-FZ200
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