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Phil Rudin

Member Since 25 Jan 2005
Online Last Active Today, 07:43 AM
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Posts I've Made

In Topic: Ikelite housing for A7R II -- tiny viewfinder

Today, 07:05 AM

I used the standard eight inch acrylic dome port and a short extension, don't recall the part number. For the 16-35 zoom a longer extension is required and I think that part number is in my review. I would like to see a smaller port configuration like maybe a six inch dome or an adapted ZEN Underwater optical glass port for fisheye lenses. Rokinon/Samyang has just announced a 14mm auto focus lens, their first designed specifically for the Sony FE not a DSLR lens with an extension like the current 14mm manual and my 12mm manual focus. I am eggier to see how this lens will adapt using a dome in the 180 to 200mm range.


In Topic: Ikelite housing for A7R II -- tiny viewfinder

Yesterday, 07:32 AM

All of the issues you have pointed out were addressed in my review of the Ikelite A7R II housing in the current issue of uwpmag.com along with a few others like lack of a back focus (thumb control) for rear AF. The TTL to manual can be switched on the strobe so I don't see that as a major issue. Regarding the pickup finder I don't think you will find any A7R II housing that has a pickup finder that will do justice to the outstanding EVF on this camera, it is quite large and the pickup finders just does not see all the way into the corners. The housing is equipped with the standard finder found in all Ikelite DSLR housings so I would not expect Ikelite to design a new finder just for this housing when you have a replacement option which as you have pointed out adds an additional cost to the system. 

 

You may want to look over my review because it addresses some other positive issues as well. An E-mail to Ikelite should resolve your issue over the Canon Fisheye as to port extension length. I used the Rokinon 12mm fisheye for Sony Full Frame so I think Ikelite will be able to give you some direction on that issue.

 

uwpmag.com is a free PDF download during the issue cycle.


In Topic: Nauticam a6300 housing

19 May 2016 - 10:22 AM

The recommendation from both Nauticam for the 180mm dome and ZEN Underwater for the 170mm dome is that you use a 60mm extension. Since the widest end of the lens is before the lens is extended to 18mm it could vignette, I would want to test this longer extension before investing in something that may not allow you to use the full zoom range.

 

Not sure that I agree that the 90mm AF is "very bad" it requires a learning curve as any new lens would. Do agree that it is a bit slow compared to some macro lenses and that if you are shooting video that the lens should be manually focused. I shoot the lens with the focus limiting switch set to the 0.5m-0.28m range. Anything beyond half a meter is a bit to much water between the lens and subject in most cases. I also have the lens optical steady shot turned off. I have used the lens on both the Full Frame A7 series cameras and the A6300 (above water). I have the manual lens gear in my Nauticam A7R II housing but only use it if I want to be sure I am focused all the way to 1:1.


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.