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Member Since 07 Nov 2004
Offline Last Active Jul 28 2015 05:05 AM

Posts I've Made

In Topic: Backscatter Airlock Vacuum system with Nauticam M16 bulkhead

19 July 2015 - 11:54 AM

I will buy it. PM sent.

In Topic: Red Sea long white shell

18 July 2015 - 08:04 AM

Great write-up!


In Topic: Any Luminescence / UV / Blue light experts out there?

13 July 2015 - 06:18 PM

Some useful info can be found here:





In Topic: Red Sea long white shell

13 July 2015 - 06:08 PM

It could be part of a scaphopod shell a.k.a. tusk shell, a type of mollusk.

In Topic: Diopter

30 June 2015 - 08:18 AM

You need to know that diopters reduce the working distance, this may be good or bad.

I have used the Nikon achromatic diopters (long discontinued) with the old 70-180 Micro-Nikkor with good results - for salmon egg pix. More recently I have done some experimenting with a vintage 200mm Medical Nikkor lens that came with a set of dedicated diopters.


Using them is a matter of trial and error. They cannot be removed during a dive as they are mounted on the lens inside the housing. Doing direct comparisons is an impossibility without two identical setups other than no diopter on one.


More recently a number of (presumably, since they are multi-element) achromatic wet diopters have been introduced for extreme magnification but I have not used them for my purposes since it would be quite awkward using them in a stream. See threads on them on this site.