Wide Angle Set Up for Sony a6xxx

I would love to hear about your experiences with the gear once you've had a chance to use it. I am considering the same rig (vs. upgrading my old and heavy D200 / Ikelite setup)

My first version of a 3D printed ring to get focus going on the Samyang Rokinon 12mm initially (8mm later), after some refinements to get it to properly stay on the lens) worked out great only for the first few seconds of trying.

Then the realisation set in that the ring simply was not deep enough the rubber gear needs to be hard supported all the way out (or in, towards the diver so to speak) underneath the rubber teeth. if not the rubber gear (the one for the 10-18) is flexible enough and the manual focus on my 12mm moves hard enough (which I like, just hard in comparison to an e-focus lens like the SEL1650) so that manual focussing works until at some point the gear teeth flex out of the way (w/o the gear itself being pushed out of location. I tried to keep that 3D printed ring such that I can leave the ring on the lens pretty much permanently (since in order to get it to not slip I made it a split ring, rubber coated the inside and low profile cable tie-wrapped it hard to the lens and to get it off it is necessary to cut the tiewrap, which i would like to avoid (multiple times?) on a trip.

Anyway, a second attempt with the support ring supporting all the way out to the very tooth end of the gear shall be done... in due time (no diving in sight for a while...)

I dived with a Samyang 12mm manual focus with the 6" dome.  Its not really workable as you really do need the focusing.    Whilst you can setup gears to manually focus, its kinda fiddly to operate underwater I think and difficult to nail the focus accurately.

What I did is I removed the front outer casing on my Zeiss Touit 12mm.  It now easily fits inside the Seafrogs case.  Haven't dived it yet but it should be good.

Thrawn777 wrote:

I dived with a Samyang 12mm manual focus with the 6" dome. Its not really workable as you really do need the focusing. Whilst you can setup gears to manually focus, its kinda fiddly to operate underwater I think and difficult to nail the focus accurately.

Could you instead just preset the focus to suitable for the typical 3-4ft range, and use the aperture as needed to expand DoF?

kelpdiver wrote:

Could you instead just preset the focus to suitable for the typical 3-4ft range, and use the aperture as needed to expand DoF?

And thats pretty much exactly what I did.. I set focus to about 5 feet and aperture at f/8 before a days of diving. Footage looked ok on the A6300 screen during the day.

But on the laptop.. 90% of footage is a little out of focus... I do a lot of scenery shots.

Aperture control is manual as well through the aperture ring.. so not reachable during a dive.

hi

i have same camera to use, just consider 16mm in APSC means 24mm in FF.

therefore i choose Sony 16mm instead of 20mm. i am also planning to have their wide and fisheye  converter. The opening of F2.8 is rarely being used underwater anyway, usually f8 and above if you have strobe with u.

rgs

Rendra

jakarta - indonesia

I'm using samyang 12mm fisheye with sony a7r3. And loved it. For focus, i use zeiss 16-35 focus gear with 3d printed ring. The printed ring fill-in gap between focus grip and focus gear.

The ring is couple millimeter thick. I recommend you print it a bit thicker than it should. Then use sand paper to refine perfect fit. Also, you can add so e rubber band if its too loose.

For apeture, is set to f8 all the time.

Hi, do you have any update with your set up forvthe sony 16mm 2.8 with fisheye? Coz, I'm planning with that kind of set up. Tnx