Camera Raw: Sony rx-100 underwater lens correction

  • 2
  • Question
  • Updated 3 weeks ago
  • (Edited)
Does anybody have a lens correction for Sony rx-100 with mpk-urx100a underwater housing? 

Without a proper calibration, the pictures suffers severely from color aberrations and radial distortion. Saves me for a lot of time if somebody have a lens profile that match my setup.
Photo of Green bubbles

Green bubbles

  • 3 Posts
  • 0 Reply Likes

Posted 3 weeks ago

  • 2
Photo of Todd Shaner

Todd Shaner, Champion

  • 1111 Posts
  • 360 Reply Likes
See the notice at this link.:

https://www.sony.com/electronics/cyber-shot-compact-cameras-other-accessories/mpk-urx100a


Not sure what you mean by radial distortion, but he Sony RX100 uses the Built-In lens profile. Do you have anything attached to the lens filter mount?

Partial darkening or distortion of the screen may occur with certain kinds of accessories attached to the filter thread.

https://forums.adobe.com/message/9397182#9397182

You'll need to adjust the WB to correct for underwater lighting.  Please post a screenshot that shows the issue.






Photo of Green bubbles

Green bubbles

  • 3 Posts
  • 0 Reply Likes
Thanks for the reply!

In the center of the image there is almost no chromatic aberrations, but in the edges of the image there is a lot. Here in this image I have checked the chromatic aberrations remover button in Lightroom -> lens corrections. This remove some of the problem, but the picture still have some aberrations as well making the picture getting "dragged" toward the center.

Radial distortion might not be the correct term. But the clarity of the image get bad toward the edges. This may be the lens quality, but this problem only occur when taking photos underwater. I guess this is because of light moving trough different mediums. This photo from wikipedia describes the problem quite well. https://en.wikipedia.org/wiki/Underwater_vision#/media/File:FlatMask_above-below.jpg

My idea was that a camera calibration would fix this problem.

Edit: No additional lens or filter is used.


(Edited)
Photo of Todd Shaner

Todd Shaner, Champion

  • 1111 Posts
  • 360 Reply Likes
I think what you're seeing is a combination of chromatic aberration due to the housing glass and some focus error (too far).  To minimize this try setting the focal length to a less wide angle setting (50mm equivalent) and perhaps use manual focus. Also make sure the LR Lens Corrections panel is using the default 'Built-in' lens profile as shown below.

Check that you've assembled the RX100 camera in the mpk-urx100a housing using the correct inserts and rings for your specific RX100 series camera model.

https://www.sony.com/electronics/support/res/manuals/4688/46880411M.pdf




Photo of Green bubbles

Green bubbles

  • 3 Posts
  • 0 Reply Likes
Again, thanks for the reply!

Yes, I did not hit the focus right on, but I do get an distortion of some kind. And by setting a longer focal length, the distortion and chromatic aberration is much better. But I need my 28mm focal length, so need some other ways to solve the problem. 

The build-in lens profile from LR is working just fine, and the uw housing is correctly installed.

But would a calibration done with uw images of a checkerboard do the thing? 

Normal images (not uw) have some chromatic aberration, but it is almost not noticeable after applying the LR lens corrections as you mentioned in the last post.
Photo of Todd Shaner

Todd Shaner, Champion

  • 1111 Posts
  • 360 Reply Likes
Try applying Defringe correction under Lens profile> Manual tab as shown below. The basic chromatic aberration (CA) correction fixes only lateral chromatic aberrations. The Defringe tool can be used to also correct any remaining CA, which is of the axial type. It looks like Amount 8 and Green Hue 17/38 works well. You need to keep the Amount slider as low as possible to prevent desaturating similar colored areas of the image. You can create a preset to apply these settings along with any other settings you normally use for underwater images.

http://blogs.adobe.com/lightroomjournal/2012/04/new-color-fringe-correction-controls.html