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Flotation for E-M1 mk ii

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I am wondering if anyone can perhaps save me some time weighing stuff in the bathtub. I will be soon taking the new Nauticam E-M1 mkii housing out for the first time, using it with a Zen 170mm dome and the 7-14, a Zen DP100 dome with the Oly 8mm FE and the macro 65 port with the Oly 60 lens. Also two Z240 strobes.

 

Has anyone gotten buoyancy requirements dialed in for the housing with those ports and same or similar strobes (salt water)?

 

Thanks

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I shot it last week. For the most part I shot with 1 set of our medium float rings that have about 1.75# of flotation, which is a bit heavy. OK with the 8mm. I did use 2x that and found it almost too much.

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Thank you for the response jack. So 1.75# was too little but 3.5# was a bit much, right? That was with the 100mm glass dome and 8mm lens? I am still hoping to have time to do some tests, but if not, I might start with 2.75# on the 8mm, and extrapolating from there, 3.5# with the macro port and maybe 2# for the 170mm.

 

Does that sound close to you?

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I have been using two Nauticam 2X10 inch (more less) float arms, around 700g (24oz) lift with the Olympus 7-14 zoom, NA-EM1II housing and Zen 200mm port, with two Inon Z-240 strobes. Works for me. For the Olympus 8mm I use the Nauticam 140mm port with 17mm extension with two Inon Z-240's and no strobe arms.

Edited by Phil Rudin

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It was with the 170mm Zen dome. I'd say about 2.25# or so would be good. I also used the Stix float collar with the Zen dome and 7-14 as there's lots of room to mount it on the port adapter. It gives about 1.5 lbs of flotation.

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Thank you Phil and Jack...your numbers saved me time. I did some measurements in fresh water yesterday and came up with about 2.4 lbs for the 170 dome in fresh water, so about 2.25 should be right.

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I have been using two Nauticam 2X10 inch (more less) float arms, around 700g (24oz) lift with the Olympus 7-14 zoom, NA-EM1II housing and Zen 200mm port, with two Inon Z-240 strobes. Works for me. For the Olympus 8mm I use the Nauticam 140mm port with 17mm extension with two Inon Z-240's and no strobe arms.

Hello Phil,
I'm curious about your rig, 200mm dome with Oly 7-14? My guess is that you already had the 200mm dome for the N120 system.
What adaptor / combination do you need? Do you see any benefit over the 170 dome?
Thanks in advance.
Kind regards,
Joss
Edited by Joss

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Edited by Deep6

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Hi Joss,

 

To address your questions, I have owned the Zen 170mm, Nauticam 180mm and Zen 200mm optical glass ports which I have used with the Olympus 7-14 mm zoom and/or Panasonic 7-14mm zoom. My configuration with the Nauticam NA-EM1 II housing is with an 85 to 120 port adapter with lock and a 20mm extension ring with lock.

 

The benefit over the smaller ports has been argued extensively in other threads on this site. For me all things being equal, yes I feel the Zen 200mm offers more benefits for both split shots and corner sharpness. Be aware that the Zen 200mm port has been discontinued.

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The discussion is going away from flotation, towards domeports...

 

I apologize, but allow me just a remark on the 200mm domeport: Athena still produces a, likely identical, domeport, so it is still available: https://www.unterwasserkamera.at/shop/catalog/de/product_info.php?info=p5758_athena-dome-port-opd-f200v-nauticam.html

 

It comes with Nauticam connection, but I do not know which (N85, N100, N120), but this can be easily asked at the dealer...

 

=> As we discussed in other treads the 200 mm port (with r=110) allows correct positioning of a MFT 7mm WA, while the 170mm or 180 mm ports (also r=110) do not allow this, as they will vignette upon correct positioning...

 

Wolfgang

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I have a very similar setup, theEM-1 Mk!! with 12-40mm and 2 x Z240, Zen type II dome. I'm using INON float arms two at 135 gr and two at 210 gr each so total is 690 gr and it seems about right, but still negative. I tried 2 x 135 and 2 x 390 gr with the macro port and 60mm macro and it ended up positive, so I went back to 690 gr the same as the Zen dome, but it's still a bit more negative than when using the dome.

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I have owned the Athena 200mm port as well with the threaded Olympus style mount for the 4/3 housings like the Athena housing in the attached photo. This was during an advert shoot in Las Vegas for Turnberry Co. using an Olympus E-3 and Olympus Zuiko 8mm F/3.5 lens. It also worked very well with the Zuiko 7-14 DSLR lens.

post-2618-0-20101500-1518976402_thumb.jpg

post-2618-0-55688600-1518976415_thumb.jpg

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I'm using the Nauticam 90x170 Carbon Fiber Aluminum float arms and its neutral !!

al

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