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oskar

Member Since 10 Jan 2007
Offline Last Active Jan 26 2015 11:31 PM
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Posts I've Made

In Topic: Full Frame SLR wide angle corrector port tests

20 January 2015 - 05:36 AM

Great work!  

 

I have also  been musing on that corrective elements should be brought back into UW photography, á la Nikonos, but a general afocal solution is great!  I'm very interested in what the practical / theoretical limits of FOV could be. Also convex front elements of ultra widangles probably cause problems with fixing the lens.  I suppose the internal and external corrective lens distance and co-axial pracements are very very important.

 

Keep us posted, and I hope some manufacturers catch on!

 

Cheers

/O


In Topic: Land based flash underwater?

20 January 2015 - 05:12 AM

Interesting! Pls post some pictures as you go.

 

Cheers

/O

 

Still a work in progress... got the strobe ( Yongnuo yn-460) and building the controls now.. It will be a tube design and the length of the flash is 135mm, if you remove the shoe and modify the head (its not going to swivel ever again) the length can be reduced.. Manual only of course..


In Topic: Oly 12mm f2 in Nauticam 3.5" mini dome.

20 January 2015 - 04:54 AM

There is another thread on the DSLR forum on using the 12mm in the 4.33" dome. There it was tested with a different set of diopters. Go have a look.  I have the lens and got the diopter but is yet to take it underwater.

 

The few dives i managed to do last year was with the 8mm FE, no time for a  "junk dive" at all to test new equipment unfortunately :-) 

 

I've used it with the 4.33" dome and no extension, so similar setup but not the same. My general experience was that the image quality was fairly good, but that the minimum focusing distance restricted how close you could get. Also 12mm is not really all that wide underwater. On the plus side, it is a very compact wide angle setup.

 


In Topic: Sony a7 series with 28mm and clip-on fisheye

20 January 2015 - 04:47 AM

My hunch is that there are not many UW users of the Sony a7x systems so far. Isn't that right?

 

Everybody are waiting for the right lenses...

 

/O 


In Topic: Land based flash underwater?

14 January 2015 - 10:53 PM

I've done this with youngnuo 462 before. No heat issues. I sacrificed all controls though. You can strip the plastic of the body too if you feel brave and get a separate battery holder. Beware of high tension. I'm also using 18650 type lithium batteries instead of AA