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Phil Rudin

Member Since 25 Jan 2005
Offline Last Active Today, 06:06 AM

Posts I've Made

In Topic: Are people leaving micro four thirds?

04 May 2016 - 01:55 PM

Hi Tom, I was skeptical also but had several chats with design teams from two major manufactures of dome ports and both confirmed that the flange distance, in this case about 22mm rear lens element to sensor for Sony full frame mirrorless and about 42/43mm for Can/Nik FF DSLR does in fact make a difference with lenses of like angles of view. The result is that smaller domes can be used with mirrorless cameras with the same sensor size as a DSLR and still achieve like results.

In Topic: Are people leaving micro four thirds?

03 May 2016 - 10:34 AM

Several points and a few photos. First Olympus involvement in the 4/3 systems goes all the way back to the Olympus E-1 which was a DSLR as were the E-3 E-5 and a bunch of E-400 to 600 cameras. Olympus M/43 Mirrorless cameras and open platform allowed this format to begin to gain traction and evolve into what it is today. At the beginning no one gave the 4/3 system much of a chance for success but now everyone has mirrorless cameras and several new players have become involved. The system has had many growing pains including when Olympus dropped the 4/3 DSLR line completely. To the issue of people leaving M4/3 I think the answer is that their are simply many more systems to chose from and many manufacturers have found a niche within an ever growing market. Panasonic for instance became the go to for video. Now you can find a lot of excellent video choices beyond Panasonic. 


I think a more accurate topic may be are people leaving DSLR for mirrorless camera systems. With the introduction of the Sony A7 lineup you now have a full lineup of mirrorless cameras that can compete at the very highest level of both image quality and video performance. 


Regarding the size factor M4/3 and APS-C mirrorless bodies like EM-1 and Sony A6300 will always allow for a smaller and often cheaper overall system V. most DSLR's. Lens size however is a simple matter of physics and full frame lenses regardless of mirrorless or DSLR by their nature will always remain larger and more expensive. 


I have included the front page from my review for uwpmag.com on the Sony A7R II and Ikelite housing, for the full review go to uwpmag.com for this FREE PDF download.


I have also included photos of the Nauticam NA-EM-1, NA-A7 and popular DSLR housings for size comparison. The Sony housing is clearly a "tweener" sitting between the M4/3 and DSLR. I also included a photo of the Sony NA-A7R II housing with the port configuration for the Sony FE 16-35mm F/4 zoom, while the lens is about as big as a 16-35 for DSLR housings it can be used with a much smaller 180mm port with results as acceptable as the 16-35 on DSLR with a 230mm port. This is a result of the shorter distance between lens and sensor in mirrorless cameras like A7R II. I also included a photo of the Sony A6300 with Zeiss 12mm and A7R II with Rokinon 12mm for a size comparison.


Regarding lens choices M43/ has a excellent set of lenses for U/W photography in verity of price ranges. Sony is catching up with both FF and APS-C lenses but at present M4/3 is still ahead in that area. The ability to adapt lenses to mirrorless cameras has also improved with excellent adapters like the Metabones.  

In Topic: Nauticam domes on Aquatica housing...

02 April 2016 - 07:50 AM

Off topic, great job on the new Zenunderwater.com web site.

In Topic: Fisheye with Sony a7Rii

20 March 2016 - 09:30 AM

Another Fisheye option for the Sony A7R II is the ALL MANUAL Rokinon 12mm F/2.8 ED AS IF NCS Fisheye for Sony E-mount. I used this lens with the new Ikelite Sony A7R II  TTL housing, the up to 2.8 inch universal gear (included with the housing along with a second up to 3.0 inches gear) for focusing the lens using focus peaking, a very short port extension and the Ikelite eight inch dome port. Prior to the dive I set aperture at F/9 and used shutter speed and ISO to control exposure. I also used two Ikelite DS 161 strobes set to TTL along with two dome defusers. I think a smaller diameter port  configuration could be supported using perhaps a 140 mm dome port. The eight inch port worked across a wide range of subjects but is not ideal for very CFWA. This lens is also branded as a SamSung and perhaps others, it is quite sharp and works well out of the water for such things as astro photography.



In Topic: Which Bulkhead for Nauticam A7RII housing?

01 February 2016 - 07:38 AM

I have been using the Nauticam flash trigger with fiber optic cables and Inon Z-240 strobes. The flash trigger has a very fast recycle time and a very long lasting battery. 


Be aware that all of these flash solutions Nauticam, Ikelite and Nikonos work in manual flash mode NOT in TTL.