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Member Since 02 Apr 2004
Offline Last Active Oct 11 2017 12:21 AM

#354616 60mm VS 100mm DOF

Posted by gobiodon on 24 November 2014 - 12:09 AM

In my blog I made a comparision of 30mm, 50mm and 100mm macro lenses taking the same subject at approx. the same magnification:



You will see that the DOF is the same in all 3 cases (at given F number) but the perspective is completely different. Check especially the relationship with the background (not just the background blur and the field of view, but how the close subject behind the main one looks).

They were taken not underwater but I hope it's helpful.

#337234 What type of fiber optic cable for DIY sync cable

Posted by gobiodon on 20 September 2013 - 12:42 AM

I want to make a long (about 3 meter) fiber optic sync cord (L-type see & sea ends) to use with an off camera strobe (for snoot photography).  I do not want to use a remote slave trigger ( such as the Triggerfish).  I have found a source for See & Sea compatible end caps that will accomodate a 2.0mm external diameter fiber optic cable.  I need to find out the best type of fiber optic cable to use for this application, and a place where I can order this cable.  If any of you can offer any insight on the type of cable rquired, I would appreciate it!  Thanks, Doug

Check this:


The  2mm diameter fiber is not so flexible. Maybe the 1mm is enough. If you want to curl your filament, check this link:




#329669 DIY curled optical cable

Posted by gobiodon on 13 April 2013 - 07:12 AM

It was a topic before to make DIY optical cables. There were suggestions to simply use optical fibers as cheap options. There are many dealer selling it per meter.

To make the length variable, the fibers can be curled. Previously I tried to use a hair drier to form the fibers but I've just found the hot water approach better. I gave a detailed description on how to curl optical fibers on my blog:




I haven't tried it underwater but it should work well.