Wwl-b1 with 24-60... What focal length?

[HCIdiver]

I was watching alex excellent video on a1 Sony settings and he mentioned using SteadyShot Adjust Manual mode when using the 28-60 lens with the wwl-b1 wet lens. He suggested to dial in the focal length in this scenario. 

Quick kudos for the smart ones on here that know how i can find this out please? Is it 14mm or more or less? 

 

Weather is bad here so im tweaking....

Edited July 27 by HCIdiver

[HCIdiver]

OK. Did a bit of googling... and found a post on this site from @Architeuthis here: 

Based on this I am guessing the answer to my question is 13mm! 

 

REplies below if im wrong...

 

[fruehaufsteher2]

Maybe this helps:

https://www.usa.canon.com/pro/electronic-range-calculators/angle-of-view?srsltid=AfmBOopuFgvwHXgH0bqclAwuZc_ufA1ykX-Sy2UdmSg6C-fWz8_ckvMu

in combination with the Nauticam Port Charts:

https://www.nauticam.com/pages/wwl-1-port-chart

 

The converter FOV is 130-70 degrees but the information whether this is vertical, horizontal or diagonal is not given. Let‘s say it is diagonal.

 

The according focal length at 130 deg could be around 10-11mm if used on land. For 70 deg it is around 30mm

 

[Chris Ross]

The WWL is a 130° field on the diagonal axis however it is stretched significantly more in the corners due to the barrel distortion.  The horizontal field works out to be about that of a 13-14mm full frame lens.  It is equivalent to a 10mm or so rectilinear lens only on the diagonal.  I would think using the horizontal field which has a slightly magnified image scale as input to the stabilisation routines would probably be the best bet as it is  the effective focal length for most of your subject.