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Pavel Kolpakov

Member Since 27 Nov 2015
Offline Last Active Yesterday, 08:37 PM
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Posts I've Made

In Topic: Strobe speed vs. SS

15 September 2018 - 12:37 AM

       Tom is right. Normal Sync Speed (shutter window is fully open) is determined by the camera, not the strobe. Underwater strobes work only with fully open camera shutter, because they produce flash mono pulse only. Underwater strobes don't support HSS. 

 Mechanical shutter of modern DSLR cameras has sync speed about 1/200 s. This is fast enough for 99% of underwater shooting tasks. Don't forget that flash duration is just 1/1000 by itself, it freezes moving underwater objects very well.

 

       If you need more fast sync speed with underwater strobes for any special aim, then use cameras equipped with electronic-mechanical shutter. For example, one of my cameras Nikon D50 has sync speed up to 1/500. But believe me, for normal cases this is not necessary. I used sync speed 1/500 with underwater strobes only 1 time for all years of underwater shooting. Don't forget that camera has other controls as well, for getting desired exposure.

       If you need a speed more fast than 1/500, than use land strobe in the housing. This case High Speed Synchronization (HSS =40 khz flash flicker) is available, for speeds up to 1/8000.


In Topic: Sea&Sea YS-D2 strobe Problem

12 September 2018 - 03:17 AM

Instead of starting new topic I want to ask about TTL Sync with Canon 5D and Sea&Sea YS-D2.

 

Is it possible to get TTL via 6pin cable like this 

https://www.easydive...21/bulkhead-s6/

 

or only via special electronics like this

https://uwtechnics.c...housings-detail

Hi Tomek,

 

Sync cord is just a wire, nothing more.

For uw strobe automatic light control you need electronic TTL-Converter.  Device supports rather complicated dialog with camera by 6-wire Canon HotShoe interface and controls lighting exposure. At device output you can connect YS-D2 by fiber optics or by sync cord.


In Topic: Seafrogs ST-100 Pro Underwater strobe - need your openion

18 June 2018 - 09:54 AM

Dealers say that this is Meikon company product.

https://meikon.com.h...derwater-strobe


In Topic: Nauticam housing for Nikon D300s

13 June 2018 - 08:34 AM

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Products are following:
NA-D300s housing - 1000 USD;
230mm Glass dome fisheye port #18808 - 1200 USD;
N60G Macro port #18701 - 230 USD.

In Topic: Nauticam housing for Nikon D300s

12 June 2018 - 02:50 AM

The price is slightly reduced: 1000 USD