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Gudge

Member Since 16 Oct 2005
Offline Last Active Today, 01:55 PM
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#343438 Sigma 15mm fisheye focus problem

Posted by Gudge on 16 February 2014 - 03:47 PM

One of the main requirements of using the appropriate extension ring is to ensure the centre of the dome port is aligned with the entrance pupil of the lens:

 

http://www.marinethe...domespacer.html

http://wetpixel.com/...les/dome-theory


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#339263 How did you flood?

Posted by Gudge on 10 November 2013 - 11:04 PM

 

Final note:  The vacuum check system may extend all the way back to the 70's.   I'm asking around to find out more....

I think you will find that doing a vacuum check to ensure that the seals on submersible enclosures are functioning correctly goes back a very long way.  I spent a large chunk of my life as a Submarine Engineer Officer in the Australian Navy.  The last thing we did before going to sea and diving after an extended period in harbour for maintenance was to close all the hatches, pull a vacuum inside the submarine and monitor over a period of time to ensure that none of the seals on hatches, periscopes etc were leaking air into the boat.  This has been a standard maintenance procedure in submarines for a long time.  If a vacuum check is good to keep me dry when the submarine dives (water in the people tank is not a good thing :) ) it's good enough to ensure my camera stays dry when I take it diving.




#338737 Changing the D7000 to Inon Z-240 fibre optic cable connector!

Posted by Gudge on 28 October 2013 - 07:18 PM

I think that the old larger cap will fit on the T4 strobes but not vice versa.

Bill

That's my experience.  My wife uses Inon S2000 strobes (same connector as Z240 Type 4) with fibre optic cords off her old Type 2 Z240s.  No impact on either manual or sTTL function has been noted.




#338502 Retra LSD Prime and old INONs?

Posted by Gudge on 22 October 2013 - 03:00 PM

I think Retra's web site was a little out of date when I ordered my Retra Pro.  At that time the angled adapter was offered as an optional extra and I ordered mine without it.  When I received it, it was fitted with the angled adapter.

 

The angled adapter is good in that it allows you to align the LSD so that the aiming light in the strobe is shining on the centre of the light collector in the LSD.  This ensures that the beam from the aiming light is a bright as possible and accurately shows where the beam from the flash will fall.  The only downside I found was that because the angled adapter is clear to allow you to align the strobe's aiming light on the light collector, it does allow some light from the strobe to escape.  Depending on strobe position this can allow escaping strobe light to light the background of your shot.  For example:

 

ROSS9284-M.jpg

 

ROSS9823-M.jpg

 

Although it can work to your advantage as shown in these two shots, in general it doesn't.

 

However it is easy to fix the strobe side leakage problem.  Once I had determined the optimum position for the LSD on the strobe I put an alignment mark on the LSD and the strobe and covered the clear adapter with duct tape.




#332375 Help needed with Olympus EPM1

Posted by Gudge on 04 June 2013 - 01:51 PM

You're not doing anything wrong.  The maximum flash sync speed of the E-PM1 is 1/160.  Once you attach the flash the maximum shutter speed you can set is locked at 1/160.




#324589 Kenko 1.4 TC...but which one!

Posted by Gudge on 16 January 2013 - 05:09 PM

While I do use a Nauticam housing I am using Subal mount dome ports/extensions with a Nauticam/Subal converter. Therefore, I can't answer your question directly based on what I'm using. The Teleplus Pro 300 is 19mm long so you'll need an extension ring as close to 19mm as possible. I add a Subal 18mm extension ring when using the teleconverter but in your case it looks like the best fit is the Nauticam 20mm extension ring:

18520 Compact Port Extension 20

Edit: Correct part is Extension Ring 20 #21120

You will also need a new zoom gear for the combination:

19227 TN1017-Z+1.4


#322123 This is terrible. How do you photography one of these?

Posted by Gudge on 06 December 2012 - 03:30 PM

Took this in Lembeh about three years ago, Steve's and Adam's advice is basically what I did.

Posted Image


#315699 Will it work?

Posted by Gudge on 01 September 2012 - 09:17 PM

While those lenses may fit inside the dome and work without and extension ring the results will be less than satisfactory (distortion, soft edges etc) because the entrance pupil of the lens will not be aligned with the centre of the dome. There's more information here:

http://wetpixel.com/...ll/dome-theory/


#312804 "Eye level" of Persian Carpet Flatworm

Posted by Gudge on 14 July 2012 - 11:44 PM

Flatworms do have a "head" (for want of a better word) but it is not clearly visible all the time. Here's a couple of shots showing the "head", it's the inverted V shaped bit at the front end. Use this in your composition as you would rhinphores with nudibranchs:

Posted Image

Posted Image


#283928 inon z240 pdf manual(type 4)

Posted by Gudge on 06 June 2011 - 11:46 PM

I found this article in the Reef Photo & Video Knowledge Base much more value than the manuals:

http://www.reefphoto.com/kb.php?id=7


#191446 Where to from Singapore?

Posted by Gudge on 18 November 2008 - 11:41 PM

I probably didn't word it quite right, Philippines I've been to once, and Bali I'm probably doing next year. I'm really just looking for something where I can jump off a direct flight from Singapore and jump into the water (more or less), stay there for a couple of days, then come home. Does such a place exist? Tell me if I'm dreaming!

Fly direct to Manado via Silk Air (approx 3 hours from memory) and you can be diving in Bunaken and/or Lembeh.