Hi everyone,

Anyone know how to go about using this lens with a Nauticam housing?

Sony A7rV. Why this lens? Because it's immediately available to me for free.

All I'd need are a port and a dome.

Will reach out to nauticam as well but any thoughts?

Thanks everyone.

You'll need a couple of things, first a zoom gear - until it is on the port charts that means designing and printing one. Sometimes you'll be able to find a zoom gear from another model lens that will work, but usually a custom gear is required.

Second you need to decide which port you want to use with it. basically with Nauticam it's either the 180mm or 230mm. Some of the newer 16 - xx mm zooms work fine with the 180mm, including the newest Sony zooms and some of the Tamron zooms. Others need the 230mm port for good corner performance. Hard to tell which is needed until someone tests it,

Third you need to work out what extension is needed. getting this right is important for good performance behind a dome. This involve placing the entrance pupil at the centre of curvature of the dome. You need to work out where the entrance pupil is and do some geometry to work out where it is in relation to the dome. Not incredibly complex but you need to comfortable with geoemtry and the required calculations. The Caveat is that the calculation may be able to be done, but the lens might perform better with a little more or less extension when physically tested.

The alternative it to take a stab and and try it with different extensions if you have them available, If you don't have access to a port and some extensions probably you need to wait for Nauticam or some other interested person with the right resources to test the lens. Maybe @Phil Rudin will test it sometime?

Thanks, Chris.

Food for thought.

You could make it work, you would need a custom zoom gear and the 230mm dome port for best results.

This is not a lens I will be reviewing or recommending due the 25cm minimum focus distance just to many newer lenses that focus to less than 20cm and work great in a 180/170mm dome. At F/2.8 one example would be the Sony FE 16-25mm with a minimum focus distance of 18cm big difference when using the 180mm port.

Edited October 30Oct 30 by Phil Rudin