Jump to content


rwe

Member Since 08 Jul 2005
Offline Last Active Aug 24 2017 02:14 PM
-----

Posts I've Made

In Topic: Flash duration?

14 August 2017 - 12:52 PM

YS-D2 full flash duration - 4.2 ms. You can use full energy at shutter speed slower than 1/250.

YS-D250 full flash duration - 23 ms. You can use full flash energy at shutter speed slower than 1/50.  

But how often do you need full energy? - very rare. In many cases we use only a small part of it, and there is no problem to set more fast shutter speeds (up to Nikon's max synch speed 1/250).

Sorry, I don't know Seaflash-60 flash duration. There is a round tube inside, but tube's diameter and thickness are small. I can suppose duration about 5...8 ms. 

 

Underwater objects move rather slowly because of the water, flash freezes them fine, independently of strobe type and duration. There is no need to specifically take care of this.

 

 

 

Not all underwater objects move slowly as can be seen by the blurred critters in this photo taken on a night dive with an Inon Z-240 (shutter at 1/125): 


In Topic: Brand new Ikelite Sony a7 housing Issues.

05 January 2017 - 11:36 AM

I am considering buying an Ikelite housing and would be interested in hearing whether there was a resolution for your problems.


In Topic: Mares fin bungee breakage

18 December 2016 - 01:25 PM

I also liked the bungees because there was no excess rubber flaps and they were easier to get on and off. 

 

I did have a spare with me.  It  was the more typical adjustable strap, was from my previous fins which were also Mares, was over 10 years old, and it was still in good shape which made me think the bungee rubber was defective.  But it is obviously a different rubber and may well degrade faster.  Back in the '70s when I still spearfished, I did make new speargun rubbers periodically but I never had one break in service although they would get surface cracks/degradation over time and I would replace them.  The fin bungee had no surface cracks or obvious degradation so I didn't think it had started to degrade. 

 

Anyway I am planning on buying new straps and repairing the bungee strap as one of several spares. Triggerfish, you made the comment with respect to spring straps "if you still find them comfortable".  Wondered what you were referring to.  Are some spring straps 'uncomfortable'?


In Topic: adding a second strobe

25 November 2016 - 01:57 PM

Hmmm, yeah, my preference too would be to go for matched strobes.

 

Why go for an unmatched pair, rwe?

I was just trying to keep the bulk down a little; both for traveling and underwater.  I tried using a Nikonos 105 paired with the Z-240 some years back when I first switched to digital and decided that my diving enjoyment was significantly less carrying that much around underwater (in TTL the slower 105 also tended to overexpose pretty often).  But my present system is smaller so the difference between a Z-240 and S-2000 may not be that much.