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michaeltsantos

Member Since 28 Aug 2008
Offline Last Active Sep 01 2015 11:31 PM
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Posts I've Made

In Topic: GH4 lens recommandation

24 August 2015 - 09:49 PM

Just to play devil's advocate...

 

I use both the Oly 9-18mm wide and the Oly 60mm macro with the Nauticam 4" wide-angle dome.  I find it a good entry level set-up that gives me both wide and macro options with the same port.  (BTW, both lenses are on sale now at a $200 discount at the Olympus store).

 

For wide angle, I add a +2 diopter to the 9-18mm lens for better corner sharpness.

 

For macro, I just leave the 60mm lens on full range since focus is quite fast.  I also made a $10 DIY flip diopter holder for the Nauticam CMC for super macro shooting (the original one is almost $400!).

 

As I bonus, I was able to attach the zoom gear for the 9-18mm lens on a Rokinon 7.5mm fisheye lens.  This allows me to manual focus with this lens when used with the Nauticam 4.33" dome.

 

Hope this helps!

 

Happy shooting!

 


In Topic: Vignetting with Rokinon/Samyang 7.5mm fisheye in Nauticam 4.33 or 3.5 dome port?

06 July 2015 - 09:07 PM

Looking forward to your seeing your pictures!

 

Thanks!


In Topic: Vignetting with Rokinon/Samyang 7.5mm fisheye in Nauticam 4.33 or 3.5 dome port?

06 July 2015 - 12:09 AM

Sorry guys, don't have a nice pic available.  I'll try to do a better test this month and post pictures later.


In Topic: Vignetting with Rokinon/Samyang 7.5mm fisheye in Nauticam 4.33 or 3.5 dome port?

02 July 2015 - 11:09 PM

Hi!  Attached are some some test shots (sorry again for the bad quality).  Will try to do a serious pool test soon.

 

Test Photo 1:

 

Attached File  P6210023.jpg   135.5KB   27 downloads

No vignetting when the focus area is closest to the camera.

 

Attached File  P6210024.jpg   182.17KB   28 downloads

Slight vignetting when the focus area is furthest from the camera.

I guess this is because the front element moves in and out during focusing.

 

Hope this helps!


In Topic: Vignetting with Rokinon/Samyang 7.5mm fisheye in Nauticam 4.33 or 3.5 dome port?

02 July 2015 - 10:44 PM

Hi!  I find that it's still important to be able to focus during the dive.  It's very easy to put a focus gear on the Rokinon lens. 

 

Please see the pictures below: (sorry for the bad picture quality, not sure why the images are posted up side down)

 

Attached File  Rk1.JPG   132.62KB   26 downloads

Oly 9-18mm lens with Nauticam zoom gear

Rokinon 7.5mm lens with rubber band and "shims" (cut from a motorcycle tire inner tube)

 

Attached File  Rk2.JPG   99.99KB   27 downloads

Rokinon 7.5mm lens with rubber band and "shims" mounted on the focus ring

 

Attached File  Rk3.JPG   117.77KB   24 downloads

Rokinon 7.5mm lens with Nauticam 9-18mm zoom gear mounted (just the outer ring)

 

Attached File  Rk4.JPG   98.14KB   26 downloads

Rokinon 7.5mm lens in Nauticam EM-10 housing. Focus can be adjusted with the zoom gear!

 

Hope this helps!