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tamas970

Member Since 27 Dec 2012
Offline Last Active Mar 17 2016 02:56 PM
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Topics I've Started

WTB: Subtronic Nova/pro270

04 January 2016 - 12:50 AM

I am looking for one of these giants. Optical ttl is an advantage. Must be shipped to Germany or Switzerland.

Ultrashort nikonos cable/female adapter for HW optical converter?

24 December 2015 - 01:52 PM

I would like to try the Heinrichs Weikamp optical converter on a subtronic nova. First problem: how to connect the converter if I want to use fiber cables? Is there a light/very short nikonos cable or a female adapter to match the converter with the strobe?

German uwpix forum down?

16 December 2015 - 11:53 AM

Anybody following the German UWPIX forum? It seems to be vanished from cyberspace...


Underwater Guide number?

09 December 2015 - 04:05 AM

There are very different views on the gudie number values underwater: some use a factor of 2, some even 4(!) to estimate underwater GN from land values.

Which is correct for clean blue seawater or 50m vis pool? I suppose color temperature also has a significant effect here, the 4200-4800K strobes getting punished for their nice warm light...

 

E.g how do the inon z240's compare to the subtronic novas in terms of underwater working distance? (iso, f-stop being the same)

 

 

 

Coverage might be the cause of confusion here, "flat port" strobes, like the inons, squeeze their beam underwater, e.g. the 100°-s of the z240 becomes 70°, approximately doubling the power/surface ratio.

I guess a factor of 2 is sufficient for "squeezed angle" strobes, factors of 3+are for dome-port units, like the subtronics, seacam.


Weaker+stronger strobe in pair?

08 December 2015 - 11:11 AM

I was wondering, does anyone use strobes with different power in pairs? (coverage, CT the same)

 

I am about to buy a venerable Subtronic Nova - which is the third most powerful light known to me underwater (2nd being its successor pro270, first Baker) which I might pair with a Subtronic Maxi.

GN's underwater: 20+16, other characteristics match.

 

If I am right with the formula, I should expect GN 25.6 total (2 novas would result 28), worse case the "maxi side" of the objects ~2-3 stops shadows - which is unlikely to prevail, because where shadows are visible (macro+other close-by stuff) both strobes would operate at very low power settings.