A fantastic group of friends shared our Raja Ampat Underwater Cruise in September.
Jeff compiled this video and Dawn kept swimming into the frames.
Shot with Olympus OMD EM5 MkII and PEN E-PL6 camera's.

The  Panasonic LUMIX G MACRO 30mm f/2.8 ASPH. MEGA O.I.S. Lens is designed for the micro four thirds range of camera's. So it fits directly to the complete range of Olympus PEN and OMD digital camera's, plus Panasonic Lumix camera's.
The lens was released in May 2015 without any fan-fare, it just quietly slipped into the market.
I often find myself in need of a lens for underwater use that allows me to take in a wider view than the other macro lenses available for the micro four thirds format, as I want to reduce the amount of water between the camera and the subject. The 30mm Panasonic Macro Lens has a much wider field of view (40 degrees) than either the Olympus 60mm Macro Lens (20 degrees) or the Leica 45mm Macro Lens (27 degrees), so I can photograph larger subjects without being too far back from the critters. But if I see something smaller that I want to photograph, I can get as close as 50mm from the lens to the subject, and get 1:1 reproduction ratio. Now that's a handy lens!
Then with the addition of a strong wet lens in front of the 30mm macro lens, I can also photograph really tiny subjects. Even adding more versatility during the same dive, if I then decide I'd like to shoot some video, the 30mm macro lens really shines, as I can hand hold the camera without any shake and have enough room in the frame for the critters to play, plus not have particles showing in the frames, as I am really close to the subject.
The 30mm Panasonic Macro Lens is sharp and focuses very fast, I'm super happy with my purchase. This lens also won't break the bank, I bought mine when it was on special for less than $300. I use it with the same short port that I utilise with my Leica 45mm Macro Lens, made by Zen for the Olympus Pen Housings, as the 30mm macro lens is the same length (within a couple of millmeters) as the 45mm Leica Macro Lens and fits perfectly in this port. Some Photos and a short video taken with my Olympus E-PL6 and the Panasonic 30mm Macro Lens are below.

Microsoft ICE (Image Composite Editor) is a great tool for creating panoramas from fish eye images. The software is free and does a great job of merging photos into a panorama without needing to learn any fancy techniques or complicated software. Download here: http://research.microsoft.com/en-us/um/redmond/projects/ice/
The above Panorama was compiled by the Microsoft ICE 2.0 software, from 36 fish eye images I took on the USAT Liberty Wreck in Tulamben, Bali. I used an Olympus PEN EPL6 in a PT-EP10 housing with a Panasonic 8mm fish eye lens and Athena Dome Port. The camera was hand held and with no strobes. Shot in Manual (so the exposures were consistent across all images).
I shot the images by moving the camera in a semi circular pan at two levels (see the thumbnail images in the following slide show to see what I mean).
I then imported them into the ICE Software and let the program do its magic. The slide show below shows the steps I took. (click on the numbers to view each Screen Shot)
There are also two websites that can display files output from ICE in 3D or high definition zoomable panoramas (PhotoSynth & DeepZoom).... But that's for another day!

We have just returned from Cenderawasih Bay in West Papua having extraordinary experiences diving with Whale Sharks. Also diving some great WWII shipwrecks, aeroplane wreck and beautiful reefs.

Always in search of unique underwater photography methods (2015 marks my 40th year taking underwater photos, so I need some stimulation). A few months ago, I began experimenting with adding extension tubes on my Olympus PEN camera's.  I already owned two prime macro lenses for the PEN camera's:

• Olympus M.Zuiko Digital ED 60mm F2.8 Macro 
• Panasonic Leica DG Macro-Elmarit 45mm F2.8 ASPH OIS
  

So with the addition of a set of inexpensive extension tubes I experimented with what could be achieved without any great outlay and achieve more than 1:1 macro underwater photography AND produce high quality images.
Extension tubes are just that, a tube that connects to the camera body and then the lens attaches to the extension tube. There is no glass to add distortion, all the extension tube does is move the lens further from the camera's sensor (which without getting to technical, adds additional magnification and closer focusing ability to the camera's prime lens).
The extension tubes I used were very cheap, from memory around USD$30 for a set of two (see below for details). The important part is that these have electronic contacts, so the camera can talk to the lens. Some very cheap extension tubes available for the Micro Four Thirds Mounts do not have this. There are also more expensive extension tubes available, that look to be made from heavier material, but offer no photographic advantage.
I tried various combinations of the prime lenses. One of each extension tube and even with two extension tubes stacked to get more magnification. The results were impressive with some combinations easier to use than others, but all combinations presented with photographically good results.
I needed an extension ring for the housing port for some combinations, others worked with the standard port. See the chart below for more details. Click on the photos below to see the results: