Jump to content


Photo
- - - - -

Stacking Extension Rings - Aquatica + Canon 17-40mm


  • Please log in to reply
4 replies to this topic

#1 betti154

betti154

    Eagle Ray

  • Member
  • PipPipPip
  • 342 posts
  • Gender:Male
  • Location:Sydney, Australia

Posted 20 November 2012 - 11:49 PM

Hi Guys,

I've just realised that according to the Aquatica lens chart I should be using extension #18457 (67mm) with the 5D3, 17-40mm and 8" dome.

As I don't want to travel with yet another extension ring, can I'm wondering if I can stack the ones I already have and need to get a solution. With what I have, I can make a 63mm, 70mm or 75mm long stacked extension.

I'm guessing the 70mm solution will be the way to go, but my dome theory is a little rusty so looking for some advice.

thanks, damien
Damien Siviero
Canon 5DmkIII + 7D. Aquatica Housing. Ikelite + Inon Strobes. Canon + Tokina Glass.
http://damiensiviero.com

#2 Timmoranuk

Timmoranuk

    Great White

  • Member
  • PipPipPipPip
  • 1170 posts
  • Gender:Male
  • Location:Near NDAC, South Wales
  • Interests:Technical diving; open circuit and rebreather, U/W photography, topside photography, travel, aviation and sailing.

Posted 21 November 2012 - 04:24 AM

I don't shoot with an Aquatica but I frequently stack Nauticam extension rings. Upsides are a more flexible, weight saving solution when travelling and less cost (I should take my own advice as I have 2x20mm, 2x30mm, 2x40mm, 2x50mm, 2x60mm & 2x70mm). Downsides are a marginally heavier rig and an extra o-ring seal to worry about!
· Canon 5D3, 7D & Nauticam housings. Sigma 15mm, Canon 16-35mm, Tokina 10-17mm, Sigma 8-16mm, Canon 10-22mm, Sigma 17-70mm, Sigma 70-200mm, Sigma 120-300mm, Canon 60mm & 100mm
· INON Z-240s & Sea & Sea YS-250 Pros
· SmallHD DP4 monitor & NA-DP4. Fisheye Aquavolt 3500s & 7000s
· Zen DP-100, DP-200 & DP-230

#3 betti154

betti154

    Eagle Ray

  • Member
  • PipPipPip
  • 342 posts
  • Gender:Male
  • Location:Sydney, Australia

Posted 21 November 2012 - 06:14 AM

Thanks for the validation.

After a few beers I had the idea to jump in the pool and test out the setup. So that I can keep one extension for using on another rig, I tested the 75mm stack and it appeared to work fine. More vibrant subject matter is required, but I'm going with that for now. For Internet archive reference, it was one #18453 & one #18456.

Kind regards,
damien siviero
Damien Siviero
Canon 5DmkIII + 7D. Aquatica Housing. Ikelite + Inon Strobes. Canon + Tokina Glass.
http://damiensiviero.com

#4 Drew

Drew

    The Controller

  • Video Expert
  • 10645 posts
  • Gender:Male
  • Location:GPS is not reliable in South East Asian seas

Posted 21 November 2012 - 12:37 PM

Damien
The 18457 is actually 54.5mm extension (67mm overall). You have to minus 13.5mm from overall length to get the extension length. I stacked 2 x 18453 (28.5mm) to get 57mm and it worked fine. I used the 18453s with the macro port with the 100L and extension tubes and extended accordingly.

Drew
Moderator
"Journalism is what someone else does not want printed, everything else is public relations."

"I was born not knowing, and have only had a little time to change that here and there.


#5 betti154

betti154

    Eagle Ray

  • Member
  • PipPipPip
  • 342 posts
  • Gender:Male
  • Location:Sydney, Australia

Posted 29 November 2012 - 05:20 AM

Thanks Drew for the correction.

Seemed to work in the end, image quality didn't seem to be an issue with the stacked setup.
Damien Siviero
Canon 5DmkIII + 7D. Aquatica Housing. Ikelite + Inon Strobes. Canon + Tokina Glass.
http://damiensiviero.com