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Member Since 28 Aug 2008
Offline Last Active Yesterday, 10:39 PM

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What extension port needed for Nauti 4.33" dome to use w/ 9-18 lens?

31 July 2014 - 07:37 PM

Hi Guys!



I'm thinking of getting the Nauticam housing for the Oly EM-10.  I already have the Oly 9-18mm wide angle lens and I'm thinking of getting the Samyang/Rokinon 7.5mm fisheye lens.


Based on experience, can anybody comment on the following?:


  -  What extension port should I use with the 9-18mm lens so it will fit with the 4.33" dome?

  -  Since the front of the lens moves as you zoom, are the corners sharp at both 9mm and 18mm with this set-up?

  -  Would putting a +2 or +4 diopter on the 9-18mm lens help with corner sharpness?


  -  Externally, the dimensions of the Samyang/Rokinon 7.5mm fisheye lens is similar to the Panasonic 8mm fisheye.  How is the performance of this lens with the Nauti 4.33" dome?  Are the corners sharp?

  -  I don't think manual focus will be an issue with such a wide lens (I'm thinking of just setting focus to about 5 inches in front of the dome before the dive). I'm I correct to assume this? Would it be better if I had a zoom gear with this lens?


  -  Will the new "pancake" Oly 14-42mm EZ zoom lens work well with the 4.33" dome?

  -  Again, would putting a +2 or +4 diopter on this lens help with corner sharpness?


  -  Any other port recommendations? Since my budget is tight, I don't want to buy 2 domes (The 4" for the 9-18mm and 4.33" for the 7.5mm as recommended).  I already buying the 60mm macro port as well.