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DoubleH

RX100 IV vs V/VII/VII - is PDAF worth upgrade?

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I've been using my Sony RX100IV/Fantasea housing for a while with decent beginner-level results.  While I'm not ready for the expense nor have the time to fit a housing and climb the UW learning curve with my APS-C mirrorless (Fuji), I was at least thinking of upgrading to a newer model of the RX100.  The primary upgrade starting with the V is phase detection auto-focus which I understand makes focusing much (much) faster.  Is this a worthwhile upgrade for underwater photography?  Any other upgrades from the V onward worth considering for UW?  My primary focus is stills, a little video but not much. 

Thanks. 

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I recently bought the RX100Va. I chose the VA over the Vi and Vii for the f1.8 lens, the Vi and Vii have a f2.8 lens as it's fastest apature. Other than the apature and the focal length there isn't much change between VA (24-70mm) and Vi and Vii (24-200mm).

 

Here is the comparison of the VA vs VI:

https://cameradecision.com/compare/Sony-Cyber-shot-DSC-RX100-VI-vs-Sony-Cyber-shot-DSC-RX100-V

 

Here is the comparison of the VA vs VII:

https://cameradecision.com/compare/Sony-Cyber-shot-DSC-RX100-VII-vs-Sony-Cyber-shot-DSC-RX100-V

Edited by Dann-Oh

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Remember that underwater you mostly shoot stopped down (although maybe not as much on compacts) and with artificial light. I would probably shoot a 1" compact at about f5.6.

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