How would the lens on the RX100 need to change in order to remain fast throughout?

Started Jul 24, 2012 | Discussions thread
pcworth
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Re: How would the lens on the RX100 need to change in order to remain fast throughout
In reply to adhemar, Jul 26, 2012

Panasonic has been able to achieve a large improvement at the long end of their zoom, from f5.2 to f2.8. And this, without any significant change to the lens size!

What is preventing Sony from doing the same?

PS: 37 / 2.8 = 13 mm. Hardly bridge cam territory.

Sensor size is the answer. What nosnoop was leaving out of the explanation was sensor size. Notice that on all the cameras where they get a "fast" f-stop they have a smaller sensor than the Sony. In order for the sony to cover its sensor with light, its lens would need to be much larger. Lens diameter to sensor size is a major factor

You might not have noticed that on the LX7 they have shrunk the sensor a little relative to the LX5 and it is a fraction of the size of the RX100. Take a look at the Canon G1X with its APC sensor and the same lens range. The Canon S100, I am not sure about, but I assume the same thing applies. Take a look at the Olympus XZ-1, it has a small (LX5 size) sensor and a huge lens.

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