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Member Since 05 Aug 2011
Offline Last Active Apr 10 2015 07:26 AM

Posts I've Made

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

In Topic: sea snake question

21 March 2014 - 10:28 PM

I clearly see spines on right side white band. Also this crop is from front end of the snake and in the images from article linked by John it

appears the spines are reduced or almost absent on that end of the snake. Perhaps you could ping an email with a link to this thread to

Kanishka Ukuwela. Be very interesting to hear his thoughts.





Here is Kinishka response after he was sent a link to this discussion:


"Hi John,
Thanks for the message. The snake on the photograph is the Common File snake (Acrochordus granulatus) (check this link: http://en.wikipedia....rdus_granulatus). This is not a true sea snake. It belongs to the family Acrochordidae. They are mainly brackish water species, but they are well known to enter the sea as well.