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DIY small dome port for CFWA

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Wetpixel member Barry Guimbellot (Dupsbear) has a great article on the front page about making your own small dome port for CFWA photography. The end result looks amazing.

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Wetpixel member Barry Guimbellot (Dupsbear) has a great article on the front page about making your own small dome port for CFWA photography. The end result looks amazing.

I am one of Barry's friends who has this port. I can attest to its quality of workmanship. Soon, I hope to get some pool time to shoot with this puppy.

Bob

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I am one of Barry's friends who has this port. I can attest to its quality of workmanship. Soon, I hope to get some pool time to shoot with this puppy.

Bob

Pretty awesome. I may have missed it, but is this a glass or acrylic dome?

It would be interesting to know how it compares in price and quality to a 'commercial' dome like the Zen.

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Pretty awesome. I may have missed it, but is this a glass or acrylic dome?

It would be interesting to know how it compares in price and quality to a 'commercial' dome like the Zen.

It is acrylic. You will need to contact Barry Barry's site for price, but it should be less that the Zen.

Bob

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Fantastic work Barry - thanks for the great info and development (I know how much work that is especially making fiberglass!).

 

Cheers

James

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Pretty awesome. I may have missed it, but is this a glass or acrylic dome?

 

Acryllic - blowing a glass dome is serious work, arcyllic is more manageable without specialist kit.

 

This picture shows a home-made acryllic mini-dome on my F100 housing (right):

post-713-1225877131.jpg

 

Certainly a useful item to own.

 

Alex

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Yes, the dome is acrylic.

I priced a glass dome and found for my configuration each dome, coated inside and out, would cost ME $1000. Over a grand for a port to me is not the best use of my money. Acrylic is easy to get scratches out, glass is another matter. Glass actually has a slightly higher refractive index than acrylic. For me, using acrylic is a no brainer.

Barry

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Andy just asked what was an advantage of using the Tokina 10-17 with a 1:4X teleconverter in my port. I told him it give me more working distance so I can still light my subject and still get a good depth of field.

Below is an example of a nudibranch taken with the 10-17 and a 1:4x teleconveter. We were beside a wreck on a very murky day, so my diver is very dark in the image. On a better day, I would get a better image of the diver with this combination.

1372.jpg

 

I also tried the 10-17 with the teleconverter in a flat port just to see what I could get. I was trying to get good depth of field but with a wider field of view.

243.jpg

 

For those of you that are aware of these little shrimp on urchins, you will appreciate the depth of field in this image. Although not using my mini-dome, this image shows the benefit of a teleconverter. Without a teleconverter, I would never have been able to light these subjects.

 

Barry

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I'm chewing over buying a mini-port for CFWA. If I get one, why would I still need my 8" FE port? I can see the obvious advantages of the CFWA port - but what are the disadvantages that make a grown-up dome port still worthwhile?

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why would I still need my 8" FE port?
Your still going to need an 8" dome if you want to use any sort of rectilinear wide angle lens or shoot under/over shots.

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Oh right! Thanks mate. :clapping:

I'd forgotten about over-unders

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Oh right! Thanks mate. :clapping:

I'd forgotten about over-unders

 

Those are half the fun! :clapping:

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Those are half the fun! :clapping:

You mean it's not "fun" to try to do an over/under with a point and shoot? (no dome, just 1" of flat glass)

 

I'm always up for the challenge, but I agree my success/failure ratio of 30:1 could stand improvement.

 

LOL

 

IMG_7480-crop.jpg

Edited by CompuDude

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Andy just asked what was an advantage of using the Tokina 10-17 with a 1:4X teleconverter in my port. I told him it give me more working distance so I can still light my subject and still get a good depth of field.

Below is an example of a nudibranch taken with the 10-17 and a 1:4x teleconveter.

Barry

 

Several people have contacted me wanting to know what do use for a gear if using a Tokina 10-17 lens with a1:4X Kenko teleconverter in a Nexus housing. Below, are some pictures of a Nexus gear that will work. The gear is for the Nikon 12-24 mm lens. The fit is tight but works great.

 

100328_TokinaGear_2.jpg

Above, is the completed gear with lens and teleconverter.

 

100328_TokinaGear_4.jpg

Above, is the lens and TC without a gear.

 

100328_TokinaGear_3.jpg

The above image is the lens, TC and inserts that come with the Nexus 12-24 gear.

 

100328_TokinaGear_5.jpg

Finally, the Nexus gear with the insert that comes with the gear.

 

I use the above setup when I know I will not be shooting extra wide like in a cenote or in wreck photos. The lens and TC combination gives a field of view close to the old Nikonos 15 mm lens, but with a zoom.

 

I designed my mini port to accept the above setup without additional port extensions, which makes the port much more versatile.

 

Barry

www.creativeillusionsphoto.com

www.marinekeywords.com

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Barry, have you considered making the port for Ikelites modular system?

 

Regards Bent C

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Barry, have you considered making the port for Ikelites modular system?

 

Regards Bent C

 

Hi Bent C,

No, I was just trying to make a DIY for my Nexus that worked out good enough to make some to sell. I don't want to try to make ports for other housings.

 

Thanks for asking,

Barry

www.creativeillusionsphoto.com

www.marinekeywords.com

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Hi Bent C,

No, I was just trying to make a DIY for my Nexus that worked out good enough to make some to sell. I don't want to try to make ports for other housings.

 

Thanks for asking,

Barry

www.creativeillusionsphoto.com

www.marinekeywords.com

 

That is to bad, Barry! It looks like a great port. I am amazed that it is even possible to make such a port as DIY. Greta jobb.

 

Regards Bent

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Well, I am still building mini dome ports and thought I would answer some questions members have emailed.

 

How I get a straight cut for the dome is by using a drill press with a diamond cutoff wheel. I carefully measure with a millimeter gauge and slowly cut the dome by keeping the dome secured to the table with my opposite hand.

post-8837-1281475474.jpg

 

After cutting the dome, I use new/sharp sandpaper on a flat board to make sure the dome sealing surface is kept flat. Then, I hand cut the inside and outside edge of the flat surface, since acrylic does not like sharp edges and might craze or fracture.

post-8837-1281475492.jpg

 

Once my dome sealing surface is flat, I collect my housing parts and secure them together as explained in the original text.

 

After the dome is secured and allowed to dry for several days, I take a Nexus port cap, remove the center pressure release plug and install a air tight hose adapter in the port cap. A automotive brake vacuum is used to check every dome several times before going into a wet pressure tank.

post-8837-1281475536.jpg

 

When I know the dome is water tight, it is ready for the ocean.

 

I hope these pictures help those that want to make their own mini dome port.

Barry

post-8837-1281475512.jpg

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Well, I am still building mini dome ports and thought I would answer some questions members have emailed.

 

I hope these pictures help those that want to make their own mini dome port.

Barry

 

Thanks for the post. I'm still trying to put an old glass port on an old Ike port. Although I'm afraid that the curvature of the dome may not be enough for the Tok with 1.4. Also the Ike port diameter is slightly smaller than the port diameter and needs some sort of fitted adapter end. Got my diamond cut off wheel and drill stand though...LOL.

 

Bo

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Thanks for the post. I'm still trying to put an old glass port on an old Ike port. Bo

 

Hi Bo,

 

A Wetpixel friend of mine is machining a dome for the Ikelite port to fit the Tokina lens. I will be happy to give you his contact information in private.

 

Barry

www.creativeillusionsphoto.com

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I recently received one of Barry's domes to use with my new Nauticam housing. I am using a Nauticam / Nexus port adapter. I was concerned about the performance of the Sigma 17-70 lens in this dome. Attached are some photos using both the Tokina 10-17 and the Sigma 17-70. They look good to me. Next month, I will putting the dome to the test on some cenote dives.

 

TomC

 

Sigma 17-70 @ 17mm

post-3775-1284267478.jpg

 

Tokina 10-17 @ 10mm

post-3775-1284267465.jpg

 

Sigma 17-70 @ 17mm

post-3775-1284267497.jpg

 

Edit: I neglected to say how impressed I am with the build quality of this piece. It has a very robust shade that is fastened to the dome in an ingenious manner. That was one of the complaints I had with my old 6" dome - the shade was always getting knocked off when the deck hands placed my housing on the camera table - not anymore!

Edited by tomc

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I recently received one of Barry's domes to use with my new Nauticam housing. I am using a Nauticam / Nexus port adapter. I was concerned about the performance of the Sigma 17-70 lens in this dome. Attached are some photos using both the Tokina 10-17 and the Sigma 17-70. They look good to me. Next month, I will putting the dome to the test on some cenote dives.

 

TomC

 

 

Edit: I neglected to say how impressed I am with the build quality of this piece. It has a very robust shade that is fastened to the dome in an ingenious manner. That was one of the complaints I had with my old 6" dome - the shade was always getting knocked off when the deck hands placed my housing on the camera table - not anymore!

 

Outstanding Tom! I used the Bare dome on my Nexus D80 rig with the Tonk 10-17 for the Manta dive on the Big Island last July. Except for the plankton backscatter, the pics are good. No plankton ==> no matas.

 

And your right, good construction and minimal size. I haven't tried the Sigma 17-70 with the Bare dome. What extension did you use?

 

If I can use this one port for the 10-17, 10-17 + 1.4 TE, and the 17-70, that just leaves the set up for the 105 macro and I am good to go.

 

TIA,

Bob

Edited by Deep6

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I haven't tried the Sigma 17-70 with the Bare dome. What extension did you use?

 

I do not know what extension you would use on the Nexus housing but I used a 40 mm extension plus the Nexus / Nauticam adapter ring on my Nauticam housing. I suspect that the adapter rings adds some extension itself.

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I do not know what extension you would use on the Nexus housing but I used a 40 mm extension plus the Nexus / Nauticam adapter ring on my Nauticam housing. I suspect that the adapter rings adds some extension itself.

Thanks Tom,

 

That's a good place to start; likely 40 to 50 mm in total, I'll try 60 mm and work backwards.

 

Regards,

Bob

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Are there any nauticam users out there using Barry's dome?

I am aware that this would need a nexus port adapter already but,

I am interested to find out about any extension rings required for

a tokina 10-17 with or without a TC. Thanks in advance for any replies!

Cheers,

Phil

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