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Nikonos 15mm Service Manuals and Schematics [was: Do 15's Need Servicing?]

ianmarsh

By ianmarsh
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Chris Ross Leviathan

Chris Ross

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Many threads such as this can be found on the web archive, here is the thread as archived:

https://web.archive.org/web/20230127185242/https://wetpixel.com/forums/index.php?/topic/54607-do-15mms-need-servicing/&tab=comments#comment-399921

We do need to be careful copying threads as I believe we need the permission of each contributor to copy it, but we are free to link to it and the archive is likely to be more permanent.

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Chris Ross Leviathan

Chris Ross

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11 minutes ago, Chris Ross said:

Many threads such as this can be found on the web archive, here is the thread as archived:

https://web.archive.org/web/20230127185242/https://wetpixel.com/forums/index.php?/topic/54607-do-15mms-need-servicing/&tab=comments#comment-399921

We do need to be careful copying threads as I believe we need the permission of each contributor to copy it, but we are free to link to it and the archive is likely to be more permanent.

I do see the service manual links don't work as the archive didn't download them.  Perhaps you could link them or add them to this thread?

ianmarsh Marlin

ianmarsh

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I bought a beater 15mm Nikonos UW to see how it ticks.

 

It is elegant in its simplicity compared to modern lenses. To work on it you need a small philips, small flat blade screwdriver, and an adjustable lens spanner with points. This is a specialty item, and available on Amazon. Don't try and remove the front glass without the proper tool... you will fail.

 

Really only the control shaft "o" rings need to be replaced. These can be sourced on the internet from a fellow in France for a few dollars. The three big "o"rings behind the front glass and the acrylic window are not really "o" rings but compression gaskets.

 

In order to replace the shaft "o"rings you need to strip the lens down to its underwear. That is, completely disassemble the lens mechanically. This is not hard, but take photos and make notes as you go.

 

Be carefull not to damage the large gasket "o"rings, you will have to reuse them. THEY ARE NOT AVAILABLE ANYWHERE.

 

Some penetrating oil on the retaining ring (with the engraved writing) for the front glass is wise, but not much. Same for the tiny screws holding the shaft knobs on. These can be a deal breaker if corroded on. You may be able to sacrifice a 28mm lens for its knobs and screws.

 

Also be really careful removing the six spring loaded screws at the back. If you strip these you wreck the aluminum body of the lens. Same goes for the six philips screws that hold the front lens element /sunshade to the body. Corrosion can be a problem with these screws.

 

Remove the 2 control knobs with six TINY set screws. These may have a coat of laquer over the heads. They are super delicate.

 

Remove the front glass retainer first. Don't ding the glass.. you can't replace this.

 

Remove the front half (Sunshade) with the six philips screws. These are 2mm x 4mm. I replace these with SS socket head cap screws which are available at a bolt supply house, likely special order.

 

Remove the six rear spring loaded screws with a small flat screwdriver. These are delicate.

 

Remove the front lens element inside the dome with a lens spanner. That will allow the main optical body to slide out the back. I believe the knobs must be set at f/2.8 and infinity for the control tabs to line up and fall out. I recommend vinyl gloves when handling the optics to keep grease off them.

 

Dismantle the inner mechanics completely down to the back wall of the housing. Work slowly and photograph or make notes of this. When you get to the back wall look out for a tiny spring and ball that sits in a recess and provides the click for the aperture scale.

 

Push the control shafts back into the housing and remove the 'O'rings from the outer seat. Note which shaft goes where, as they are different lengths.

 

Clean everything of old grease. I used alcohol wipes to do this but DON'T LET ALCOHOL TOUCH THE ACRYLIC WINDOW. It will wreck it.

 

Reassemble: Use Nikonos grease on the new shaft "o"rings. The shaft is passed through the housing and "o" ring and the knob replaced pushing the gear from the inside. This is why you cant just replace the "o"ring from the outside.

 

I use a tiny coating of white lithium bicycle grease ( I like Campagnolo) to lubricate the mechanicals, but only a trace.

 

Reassembly is the reverse of disassembly. Take your time and it is actually fun.

 

Use a thin layer of Nikonos grease on the "o" ring gaskets, just until they are shiny.

 

Any locktite inside can be replaced with a dab of nail polish or touch up lacquer.

 

Make sure you get the right knob on the right shaft, or you'll be tearing it apart again (I did).

 

Use a small drop of laquer on the screw heads of the shaft lockscrews and note the orientation of the screws relative to the flats on the shaft. The screw positioning is assymetrical.

 

When you replace the six screws that hold the front element/sun shade, watch the orientation of the shade. It goes with the sun shade projections at the 12 and 6 oclock position.

 

Place the lens face down and preload the body with a bit of downward pressure as you tighten the six philips screws or the SS socket head capscrew replacements. This takes a bit of the load off the threads as this is a delicate area, and may have some corrosion already. Also I use a tiny bit of Lanocoat on all external threaded fasteners, as well as the six spring loaded screws in the back..

 

Anyway. That's my experience. No guarantees, but a fun way to spend a winter afternoon thinking about your next trip.

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ianmarsh Marlin

ianmarsh

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2 hours ago, atus said:

I wish I would need that service. The holy grail of the underwater lenses.

Just buy one for fun… they are super cheap. Before you know it you will have a canera system built around it!!!

 

Thats how we roll around here!

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  • The title was changed to Nikonos 15mm Service Manuals and Schematics [was: Do 15's Need Servicing?]
ianmarsh Marlin

ianmarsh

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3 hours ago, TimG said:

We should start a sweepstake to see at what part number on the schematic people get to and find it no longer fun.... 🤭

Good one... As my neurosurgeon buddy says... "It's not Rocket Science"

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atus Barracuda

atus

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19 hours ago, ianmarsh said:

Just buy one for fun… they are super cheap. Before you know it you will have a canera system built around it!!!

 

Thats how we roll around here!

I have been making a search in Ebay and I couldn't guess how cheap they really are. Before making a compulsory buying I have been looking for the possibilities to put it in an Aquatica Housing and the only adapter that I have found is for Nauticam housings... Does anybody knows how to adapt it to an Aquatica or Subal housing ?

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ianmarsh Marlin

ianmarsh

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6 hours ago, atus said:

I have been making a search in Ebay and I couldn't guess how cheap they really are. Before making a compulsory buying I have been looking for the possibilities to put it in an Aquatica Housing and the only adapter that I have found is for Nauticam housings... Does anybody knows how to adapt it to an Aquatica or Subal housing ?

Nauticam is your only option.... it is not possible to adapt an existing platform. The optical tolerances are much too fine, in the micron range.

It's also worth looking up Pawel Achtel's work with this lens. His application of the 15mm was used for filming some of the UW in Avatar: The Way of Water. Pawel is an amazing guy!

https://24x7.com.au/3deep/

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ianmarsh Marlin

ianmarsh

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14 minutes ago, ianmarsh said:

Nauticam is your only option.... it is not possible to adapt an existing platform. The optical tolerances are much too fine, in the micron range.

It's also worth looking up Pawel Achtel's work with this lens. His application of the 15mm was used for filming some of the UW in Avatar: The Way of Water. Pawel is an amazing guy!

https://24x7.com.au/3deep/

Also, check out Mike Veitch....http://mikeveitchblog.com/testing-mirrorless-cameras-in-lembeh-strait-part-1/

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atus Barracuda

atus

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It's a pity. Too much money to spend if I have to change my rig to nauticam just for one lens. 

Thank you fr the links, really interesting.

ianmarsh Marlin

ianmarsh

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3 minutes ago, atus said:

It's a pity. Too much money to spend if I have to change my rig to nauticam just for one lens. 

Thank you fr the links, really interesting.

Agree... it's a one trick pony, but a very sharp one. I just posted some images in the gallery... the one titled "Where's Waldo" is taken with the 15mm

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