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Seafrog dome vignetting :(

Discussion in 'Strobes and Lighting' started by Pyndle, Mar 28, 2019.

  1. Pyndle

    Pyndle Angel Fish

    # of Dives: 200 - 499
    Location: US
    64
    13
    8
    Hi guys,

    Since I bought a magnetic adapter for my dome, it is now vignetting at 16mm because of the extra 2/3mm distance added between the lens and the dome.

    So I have a seafrogs housing for my A6500 (Sony A6500/A6300/A6000 60m/195ft SeaFrogs Underwater Camera Housing) and the dome from seafrogs too (Wide Angle Wet Correctional Dome Port Lens Version II (67mm Round Adapter)).

    Both sides of the magnetic adapter fit well on the housing and the dome.

    Anyone else has that issue? Any easy fix? I’m thinking of cutting part of the dome and glueing the magnetic adapter onto it so that it sits closer to the lense, but it doesn’t look easy and might not hold up very well.

    Bonus question:
    Even without the magnetic adapter, unless the dome is in a very specific position, I can see some of the petals of the dome in my pictures. The longer petals have to be exactly horrizontal, which is fine, but that means the dome cannot be screwed onto my case all the way (because all the way means it doesn't end up in the right angle).
    I have the same problem with the adapter, I can rotate the dome but by steps of 2/3cm, otherwise the magnets don't work. And there's no position where I have the minimal vignetting on screen and where the magnet work.

    Any advice is welcomed :) Thanks!

    Edit: oops, realized it's in the wrong section sorry, but I can't find anywhere to delete the post or edit the section?
     
  2. Barmaglot

    Barmaglot Manta Ray

    # of Dives: 100 - 199
    Location: Israel
    644
    247
    43
    The longer petals have to be vertical, not horizontal.

    I used the magnetic adapter with the fixed-port housing, didn't experience any vignetting at 16mm. Maybe the macro port is a little bit longer? I recall mentions that the 30mm macro lens is a tight fit in the fixed port housing, maybe this has something to do with it.
     
  3. Chris Ross

    Chris Ross Barracuda

    # of Dives: 200 - 499
    Location: Sydney Australia
    478
    158
    43
    What lens are you using, the 16-50mm?, the standard fix is to zoom in slightly till it goes away. Unfortunately you get what you pay for, the sea frogs housings it seems work well enough but don't always provide full functionality . It is probably set up to work with other lenses as well and the variations of lens length among different options for lenses in the port mean that it is very tight on tolerance before it vignettes.

    Are there any set screws to allow the lens shade to be rotated independently, the photos of the dome are not showing that part well, but one photo shows a hole where you might expect to find a set screw.
     

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