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Phil Rudin

Member Since 25 Jan 2005
Offline Last Active Today, 08:05 AM

Posts I've Made

In Topic: Any experience with the Sony A72 or A7r2?

Today, 08:07 AM

I am shooting with fiber optic cords using the Nauticam flash trigger which is manual with my Inon Z-240 strobes. My housing also has the Nikonos style bulkhead and it can be used in manual with cords for Ikelite like the attached link I believe, you should consult your retailer for specs.



In Topic: Comparing Pana 8mm 3.5f and Oly 8mm 1.8f (1)

30 September 2015 - 07:59 AM

If you have no fisheye port Zen Underwater now offers Olympus 8mm F/1.8 ports for both styles of Olympus housings (Pen & OMD) with the extension built in.



In Topic: Any experience with the Sony A72 or A7r2?

15 September 2015 - 01:26 PM

Ken, Be aware that many of the products I review are not ones that I own which was the case at the time with the A7 II review. I also never owned or tested A7 so it wouldn't be my place to make comparisons however several non diving reviewers who I have some faith in have said that the A7 II is faster. Faster is a term which is hard to pin down and relates to lens choice and a number of other issues but I agree that some DSLR's are faster and some are not. 


The last point is that Canon 6D full frame is the only camera at the same retail price point as A7 II and while you can find other discounted FF cameras which are now a year or two old, A7 II gives you a lot of image quality for the buck. I now own one with a battery grip which holds two batteries for my out of water travel and walk around camera. 

In Topic: Any experience with the Sony A72 or A7r2?

15 September 2015 - 10:49 AM

Regarding D.K.S. comments over battery life what I said in the article is that "battery life is an issue with ALL mirrorless cameras compared to DSLR's without EVF"". Other things that drain power include 5-axis image stabilization, live view LCD, choice of lenses and more. I have used many, mirrorless cameras including the A7R II and I don't find the Sony brand to differ much from other mirrorless cameras with like features. We all know that DSLR's have better battery life because they don't have any of the features that draw on the battery in the same way and because they are for the most part much larger bodies they can have much larger batteries. 


With the FE 16-35mm F/4 lens using IS battery drain is less of a problem than with a macro lens. Regarding low light ability the shot inside the cavern opening at Gennie Springs was taken without a focus light and the focus on the dark cavern walls was tack sharp. 


I agree that the 90mm lens is more of a challenge to focus than the zoom lens but then all macros are. I don't use the image stabilization shooting macro because most macro is heavily strobe lighted and the IS does not add much value during the 1/1000th or so time that the strobe takes to light the subject. And yes I could name other macro lenses in the same focal range that are faster but none that focus more accurately and have better overall image quality. 


As I said in the article the Sony A7 line is a three year work in progress and if you compare those three years improvements to three years in the DSLR world the tech differences are obvious. Everything in photography is a tradeoff and if the feature set of the Sony A7 line is not of interest and total MP's is then a DSLR should be a no brainer. On the other hand if you are looking for a high end mirrorless camera with all of the benefits not found in DSLR's then the A7 II,R,S for video line are well worth a look.


To me the biggest to the A7 line underwater is lack of FE (native mirrorless) lenses and this issue is also being address by Sony with eight new FE lenses to be released by early 2016, I hope one is a fisheye.

In Topic: Uncompressed 14-Bit RAW image on the A7sII and A7rII

15 September 2015 - 10:08 AM

I think the difference between Sony's RAW Lossy compression and 14-bit RAW will not make a great deal of difference underwater. While a welcome addition to the A7S II and A7R II the 14-bit difference will be most noticeable with long exposures like star trails and other night photography.