That is not true. Both the Mark I and II exactly like the mark III have the lens physically longer at wide end. ...
See photos & article here RX100M2 versus RX100M3 Lens Differences.
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That is not true. Both the Mark I and II exactly like the mark III have the lens physically longer at wide end. ...
They're both good cameras and the housings for the RX100III from Nauticam and Ikelite are improved for sure.
All of these latest cameras have 24mm lenses on the wide range, so I think the external lens manufacturers (Inon, Fix, etc) will have to come out with some lenses that match fairly soon.
The LX100 is interesting for sure, but it has a super zoom lens that may make it too hard to house well. I guess we'll see at DEMA...
Jack