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Member Since 27 Dec 2012
Offline Last Active Oct 18 2016 10:30 AM

Topics I've Started

Dyron Wide angle correctors for m43?

10 October 2016 - 04:12 AM

I came across a store review of the WWL-1 and an interesting piece of glass showed up there: the Dyron SWAL13.

Has anyone tried this, and its narrower siblings on a m43 camera?


First round I'd try it on my NA-RX100iv for 4k video shooting, as a cheap alternative to the WWL-1.

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.