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Another mini-dome project


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#1 casbba

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Posted 29 October 2010 - 05:59 PM

In a previous thread I mentioned I'd had some success with a DIY mini-dome for an Ikelite housing. That port is ok for a Tokina fisheye with 1.4 TC but is a bit too long for the Tokina without a TC.

So, I needed to build another mini-dome for the Tokina on its own and here's what I did. I took an old Ikelite flat port – a short one that was used for film cameras with standard 50mm lenses – not much use these days. I just needed the rear section of this port to mate with the housing, and part of the barrel.

1.jpg

I ordered an acrylic dome from a company that specialises in blowing domes to size. Mine needed a 4 inch outer diameter to match the barrel diameter of the Ikelite port.

2.jpg

I cut through the barrel of the flat port with a hacksaw, smoothed the cut edge with fine wet and dry paper, and glued the dome onto the rear portion of the barrel using acrylic cement.

3.jpg

The most time-consuming part was fashioning a shade. I used a short section of 4 inch diameter PVC pipe and just gradually shaped it until it didn't show up in the frame with the Tokina set to widest.

4.jpg

I painted the shade flat black and spot glued it to the barrel of the port using contact cement. It can still be removed if need be.

5.jpg

The finished product.

Barry (Dupsbear) pointed out that the small 4 inch diameter of this port will probably impact on image resolution, and I may find this to be the case when I get around to using it. Unfortunately at that point I'd already ordered the dome, so decided to go ahead with the project anyway. Still, for an all-up cost of under 50 AUD, I guess I could lash out and make another one if need be.

There are a couple of other mods on this housing that can be seen in the photo above. I've fixed a strip of plastic 'wood' (modwood) to the Ikelite baseplate to give the housing a firm base to sit on, and I've replaced the circular zoom control knob and aperture control knob (obscured) with Ikelite 'wing nuts' that they use to secure their handles to the baseplate. This allows very easy one finger control of zoom and aperture, even while wearing thick neoprene gloves.

#2 Balrog

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Posted 30 October 2010 - 01:39 AM

Nice project.
Be interested to see how it performs.

#3 Alex_Mustard

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Posted 30 October 2010 - 01:48 AM

It is worth noting that these cheap domes are non-optical quality materials and manufacturer. So it will be interesting to see if that makes a visible difference to the shots, or not.

Alex

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Nikon D4 (Subal housing). Nikon D7100 (Subal housing). Olympus EPL-5 (Nauticam housing).


#4 casbba

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Posted 09 November 2010 - 03:21 PM

Yep, I couldn't agree with you more Alex. I guess for me a lot of the fun in u/w photography revolves around these little DIY projects… loads of satisfaction from making something that keeps the camera dry and gives a reasonable (while perhaps not perfect) result. It's just a hobby so I don't get too stressed about it.

Anyway, I finally got around to using the little dome u/w. It didn't leak, crack or implode, so I guess that's success of sorts… for me at least!

DSC_8694.jpg

#5 blibecap

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Posted 10 November 2010 - 07:01 PM

Can You Post a link to a full sized picture? I would be interested in knowing where you aquired the dome from.
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#6 casbba

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Posted 10 November 2010 - 10:18 PM

Can You Post a link to a full sized picture? I would be interested in knowing where you aquired the dome from.

PM sent

#7 davichin

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Posted 17 November 2010 - 03:01 PM

I ordered an acrylic dome from a company that specialises in blowing domes to size. Mine needed a 4 inch outer diameter to match the barrel diameter of the Ikelite port.


Hello!

I have a project in mind and I would like to know of companies where to order domes to size...

Thank you very much! :)
D300, D7000. 10.5, 10-17, 16, 10-20, 17-70, 60, 105, 150 Hugyfots, Subtronic Novas, Seacams 350, YS250s, YS-D1s
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#8 casbba

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Posted 17 November 2010 - 10:43 PM

Hello!

I have a project in mind and I would like to know of companies where to order domes to size...

Thank you very much! :)


After lots of searching I got mine from this link EZ Tops manufacture small domes, globes etc... though as Alex pointed out since they're relatively cheap they're not going to be optical quality. Not sure that I can spot the difference, but I'm sure there are better photographers out there who could. If you did manage to source better (ie optical) quality domes made to measure I'd be interested to find out where.

#9 davichin

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Posted 18 November 2010 - 12:25 AM

After lots of searching I got mine from this link EZ Tops manufacture small domes, globes etc... though as Alex pointed out since they're relatively cheap they're not going to be optical quality. Not sure that I can spot the difference, but I'm sure there are better photographers out there who could. If you did manage to source better (ie optical) quality domes made to measure I'd be interested to find out where.


Thank you very much, Casbba! Your dome

I guess that for marketing/economics reasons people/companies don´t share where they get their domes from... :)
D300, D7000. 10.5, 10-17, 16, 10-20, 17-70, 60, 105, 150 Hugyfots, Subtronic Novas, Seacams 350, YS250s, YS-D1s
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www.davidbarrio.com

#10 hanachan

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Posted 19 November 2010 - 07:24 AM

nice job!
i also made a mini dome 3 years ago.
how to make
photos taken with this dome
thank you.