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Udo van Dongen

Member Since 27 Feb 2006
Offline Last Active Mar 13 2014 05:50 AM
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Posts I've Made

In Topic: Dump your housings!

10 September 2013 - 07:02 AM

It also seems to work better than Rain-X on your dome port


In Topic: Nikon D90 + Hugyfot or Olympus OM-D E-M5 + Nauticam

29 July 2013 - 06:36 AM

Hi Chris,

 

To tell the truth I am not very concerned about the capabilities of Nikon D90. I think it is fast enough and the resolution and imgae quality it provides is more then I need. I agree that it is already an old camera but I don't see my self upgrading to a higher model.

 

I have searched for second hand housing for my D90 but i couldn't find anything/ Ikelite is not an option for me cause I really do not trust plastic especially if I will be using a DSLR inside it. Hugyfot was my option because it is easy to get in Netherlands, fairly priced among competiton for metal housings and it looks to have a very good slim design.

 

Anyway, I think I will check my options a bit more and probably go for the E-M5. i just have to be sure if the Macro 60 mm Nautica port can be used with 12-50mm with the addition of this 3rd party zoom gear.

 

But I still appreciate any more comments, advises.

 

Thanks

Hi Chris,

i can get you in contact with at least two persons in the UK who have a 2nd hand housing for the D90 for sale: one is a Nauticam and one is an Aquatica, i don't expect them to be expensive.

 

Udo


In Topic: care of the external surface of my (Nauticam) NA-EM5

02 June 2013 - 11:38 AM

I use a few drops of silicon oil which is sold as 'seal saver' and rub it in with my fingers.


In Topic: Housing Sentry Vacuum Seal

28 May 2013 - 06:23 AM

Udo,
 
What was amount of the vacuum you were using for your camera?  I always wondered if too much vacuum was not good for the seal.  On the other hand would it be better to have the vacuum at a level that was just above the point where the green light will change to red so that a very small leak would be detected as the vacuum decayed slowly away?  The dial on these vacuum gages are broken up by one half inch increments of vacuum and therefore the resolution is not all that good for detecting very small changes in vacuum readings. I don't know if a vacuum gage with more precision would be a better way to help detect a very small leak.  

 

I normally make the vacuum until the red light changes to green and not more for the reasons you mentioned. According to the manual this is -200 mBar (so actual pressure in the housing will be approx. 800 mBar). I guess there is still a tolerance in this vacuum as temperatures and atmospheric pressure may differ too (a larger pressure difference then a volume decrease of 2-3 drops). When i wanted to see whether i could see water leaking in, i made the housing as vacuum as a the vacu-vin pump allowed me to, and that worked, because i saw a drop of water hanging on the pin of the button when i pushed it.

I never did a pressure drop test with an accurate pressure gauge. Possibly something would be visible a week ago, but hopefully now not anymore because i replaced, cleaned and greased most of the O-rings myself now.

 

Cheers, Udo


In Topic: Housing Sentry Vacuum Seal

27 May 2013 - 06:53 AM

 
I (used to, because it quit working by itself some months ago) have a Hugycheck with its permanent monitoring and I think it is a good idea. Pressing buttons during the dive etc... may cause a leak (it did to me) even after being perfectly watertight on the surface. If I were to get a vacuum system I would get one with constant monitoring and, please, a reliable one...

 
The Hugycheck indeed isn't flawless! When i put my housing under a vacuum the green LED blinks and keeps on blinking, also overnight or longer. Last week i was using my housing in Spain and almost every day after a day of diving i discovered some tiny drops inside the housing. I emailed the manufacterer about it, and (as usual) they said it's most likely that the drops of water fell from my hair or that they are originated from the wet outer edges from where tiny drops spash in when you take the 2 halfs from the housing apart. But later that week i discovered that after a day of diving my camera body was wet too! Especially around the AF-ON button there is a rim around the button on the camera and with a balloon air blower i could blow out salt water. Fortunately my camera body still works fine, because it's weather sealed (advantage of a pro-body?). More accurate examination of the housing showed that the AF-ON button was having a slight leak. I put my housing under a vacuum without a camera and via the port i could see a small drop of water on the inside of the AF-ON button (the housing was still wet on the outside from the rinsing); no doubt about it, a leak. The Hugycheck always indicated that the vacuum is still present. Apparently a few drops of water in the housing do not cause a detectable pressure increase, which makes sense to me because the pressure increase is indeed minimal. BTW, an overnight green blinking Hugycheck was still green blinking the next morning, so based on hugycheck my housing was always perfect.
 
Anyway, Pascal from Hugyfot was so kind to send me a few new buttons, O-rings, spacers and some extra strong replacement springs which they sell for tech dive photographers who want to take photos up to 150 metres depth. My personal belief is that stronger springs put slightly more pressure on the O-rings, which will make them close better. Pascal denied it would make any difference, but i feel a little more confident about it this way. Fingers crossed the next trip! My housing is now almost fully equipped with extra strong springs except for two buttons (he didn't send enough springs...)
 
cheers, Udo