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ianmarsh

Member Since 15 Jan 2012
Offline Last Active Yesterday, 03:35 PM
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Posts I've Made

In Topic: For Sale: Seacam S180 Magnifying Viewfinder

18 October 2017 - 03:41 PM

Price drop!

 

$550 USD

 

 Will include shipping at that price.

 

ian


In Topic: Nikon D850 in D810 or D800 housings: Compatibility check

17 October 2017 - 11:01 AM

So.....

 

 

D850 in Seacam D800 housing... complete and utter fail!

 

No big surprise here, but the threaded tripod mount is not even in the same place. Never had a chance:((

 

ian


In Topic: housing for Nikon D810

09 October 2017 - 12:36 PM

Gui

 

There is one on eBay in Holland.

 

 

http://www.ebay.com/...3AAAOSwFqNZWVQV

 

 

ian


In Topic: Issues/Problem with Sea&Sea YS D2 Strobe?

03 October 2017 - 03:33 PM

Agree with all of the above

 

I purchased two YS-D2 strobes three months ago for a big upcoming trip. I am very apprehensive about even taking them... way to go Sea And Sea. What was I thinking?

 

Now they release a new version that is actually supposed to work properly. I agree. There should be a recall on all Black Sea and Sea YS-D2 and replace them with the new version, no questions asked.

 

I am toying with the idea of taking my old Nikonos SB-105 instead. I KNOW they work.

 

ian


In Topic: Introducing Nauticamís WACP - The Wide Angle Corrector Port: Discuss Here

02 October 2017 - 06:09 AM

Thanks Alex

 

Let's see if I understand this:

 

The Nikonos RS 13mm is a fisheye, so not really fair to compare to the WACP which is rectilinear.

 

I guess one thing to keep in mind is that the focal length quoted on the lens barrel is the "true" focal length, in air. This is a physical property of the lens construction. The actual focal length in use (underwater) must be multiplied by 1.33. This also changes the FOV of the lens.

 

I had long assumed that Nikon would have originally quoted the focal length (and therefore FOV) on the Nikonos RS and 15mm as the focal length in their native medium (water), since the lenses where designated as R-UW, and don't focus in air. I guess that is not the case.

 

I am assuming this does not happen with the WACP, and in fact, just the opposite. Because of the "Correction", the field of view is increased, at the same time "repairing" the damage done to the corners of the image due to refraction (CA) and curvature of field (DOF).

 

That's got to be some fancy physics. As you said... "You CAN have your cake, and eat it too".

 

That doesn't often happen in the real world:)

 

ian

 

 

 

 

Thanks Ryan.. I just spotted your response while I was typing:)