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Member Since 05 Aug 2011
Offline Last Active May 10 2015 08:34 AM

Posts I've Made

In Topic: Using a mini-altimeter as a leak detector

09 May 2015 - 09:38 AM

Hello Albert,


I think people who are into rocketry use that device to record maximum altitude. Does it have a mode that allows you to continuously observe pressure changes within the housing. How long does it remain on? Something like that would certainly be an improvement over the usual red/green light indicators. 


I see that there is also an "altimetertwo" and an "altimeter3." Do you know how they differ from yours. I think the altimeter3 can de controlled by an iPhone.


Right now, I'm using a rather large aneroid barometer the same way. However, once installed, it shifted some housing controls out of alignment - to fix that problem, I had to I shave quite a bite of material off the bezel and off the back of the thing.     

In Topic: Do 15mm's need servicing?

09 December 2014 - 05:21 PM

Hello David,


In 1985 I bought a 15 mm lens that was used a lot until 1992. Then it was put away until 2011, when my son used it on an old Nikonos V during a trip to the Red Sea. That lens had never been serviced. The knobs worked smoothly, the pictures were in focus, and there were no leaks during the 40 dives he did.


The 15 mm lens is very complex. If it seems to be working OK, then I think there is less risk in taking it on a dive than there would be in having it serviced by someone who may not have worked with one for many years. Do you know anyone who could be trusted with the job?


John McCracken

In Topic: Cuttlefish action in Devon, UK

18 November 2014 - 04:50 AM



Wonderful images. I'll have an opportunity to do a bit of diving in Ireland in May 2015. Does anyone know if there are Irish dive spots where you could witness this kind of cuttlefish action in May? How long do these spawning aggregations last?


John McCracken 

In Topic: Nikonos V help

18 July 2014 - 01:52 PM

Thats what i had figured, I'm trying to find somewhere to service it locally but if that doesn't work out is there any online places that have good reputations? I'm gonna call around tomorrow and see if I can find somebody who could do it. 


Hello Henry, 


I think you could get a good second hand Nikonos (or two) for less money than it would cost to have yours serviced. You might even want to take a crack at servicing it yourself. I had a similar problem in the mid 80s, so I very carefully took it apart, cleaned and lubed the o rings and reassembled the thing. It worked just fine. Unfortunately, I was less careful the second time I tried to do that and was unable to get it back together - I still have a bag full of Nikonos parts.


You can check for air tightness after servicing by heating the camera with a hair dryer before closing the back. Then, after it has cooled for a while, try to remove the lens . If you can feel some suction on the lens then your seals are good.


Below is a link to a Nikonos 5 service manual to help guide you if you want to give it a go.



John McCracken

In Topic: Ikelite Canon 100D / Rebel SL1 : review ?

15 July 2014 - 02:15 PM


Below are two pictures taken with the ikelite housing and the Tokina 10-17 lens set at 10mm. The first picture is taken with the ikelite dome and the second one is taken prototype precision dome. Both pictures were taken from the same location, withe the camera mounted on a tripod with 18" between the front of the dome and the same subject. I have full size images but I loaded these into the editor and re-sized them only. I hope to be able to get some pictures with both domes at 12mm soon. 


How would the coverage compare if the test photos were taken underwater? Would it change much from a surface test?


John MCracken