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Member Since 02 Mar 2017
Offline Last Active Jun 26 2019 08:49 AM

#407264 Snoot aiming advice - Retra LSD

Posted by Oskar@RetraUWT on 18 June 2019 - 11:59 AM

Thank you Tom and Chris for quickly responding to Tim's issue and helping out. Since this topic was started at the same time as Tim sent us his email I said that I will reply here. 


If you can see the pilot light clearly and more or less in the center of the beam this means the LSD is mounted correctly which is the most important thing. 

Since Tim already has experience with the LSD on his Z-240 I will skip the basics but if someone is interested here is the topic where most of the beginner stuff was covered: http://wetpixel.com/...showtopic=62595


What I would like to add is that masks act as apertures. The smaller the hole the darker the light output and with our masks it goes down about 0.5-1 F-stop per step.

With smaller holes and the Z-240 it is normal to use full power. The new Z-330 is more suited for this because of higher power and the pilot light is slightly tilted making it more central in the LSD which helps with aiming. But still the ideal scenario for snooting is a pilot light and flash tube shining from the same spot or what is more common: a round flash tube with a pilot light in the center.

#405310 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 14 April 2019 - 06:16 AM

We haven’t tested this yet on the new Retra Flash but Adam tested more than 400 flashes on the original Retra Flash which has 100Ws: http://wetpixel.com/...ymbiosis-ss2/P3
This is quite ideal test situation with new batteries, almost constant room temperature and consecutive firings. In real life there are things that can reduce the number of flash, mainly the temperature and battery age/condition. But we can expect something roughly around 200-300.

Anyway we are working on a proprietary battery pack design which will improve the new flashgun performance (not compatible with original Retra Flash). The new battery pack design will require more intensive work and we aim to confirm it’s design after the new Retra Flash Prime/PRO are already shipping. Specifications will be announced in due course. News on this here: https://www.retra-uw...ra-flash-update

#405262 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 13 April 2019 - 12:11 AM

The below graph compares two flashguns with similar specifications when set to full power. Their maximum power in the center and light fall off is similar.


Comparing SC-150 and RF PRO.png

#403290 Inon Z-330 ready light comes on early

Posted by Oskar@RetraUWT on 07 February 2019 - 01:25 AM

The problem is not with indicator lights but the lack of a testing standard that would clearly define the flashgun specifications AND that the manufacturers would follow.

#395680 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 23 May 2018 - 11:42 PM

Hi newboy


Please send us an email to info(at)retra-uwt.com and we will send you a .pdf file. 


Every strobe is included with this sheet so we are happy to send you new ones. They are waterproof so you can take them with you into the dive box. 


A few posts ago we were talking about TTL compatibility and I want to add that we are still working on a new firmware. We decided to make some changes which could help us be compatible with existing converters. The results are yet to be confirmed but once we have an update available we will notify everyone about the possibility of upgrading the firmware. 


Thank you very much!

#392686 Wetpixel strobe review

Posted by Oskar@RetraUWT on 25 February 2018 - 01:58 AM

In fact, thinking twice about it i am not too sure what would be my favorite strobe behavior in regards to capacitor not fully charged, but i'd still like to know how the Retra and Inon are supposed to behave in that regards.


If there is something fast going on and you are unable to wait for the complete recycle time you usually want to get some light onto the scene instead of having a dark image, later possibly solving it in post production. The Retra Flash will fire before the ready light is on. 

#391625 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 24 January 2018 - 11:27 AM

Hi guys, what sort of routine do you apply for the retra o-rings:
-Lubricating each time you open battery compartment?
-taking out the orings to do so?
-with which lube? I have hips of inon grease...


Envoyé de mon iPhone en utilisant Tapatalk

Hi Nicolas


We suggest lubricating every 10 times the battery compartment is opened/closed. The o-rings don't need to be taken out if they are clean and without dirt or debris. We supply a silicone grease with the Retra Flash although any silicone grease is useful for lubrication. 

#391129 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 11 January 2018 - 04:10 AM

Hi Nicolas, the problem with overheating is usually at the lamp where the majority of heat is generated. For this reason we are using high quality quartz glass which has a much higher melting temperature compared to borosilicate glass used in most photo flash. Higher melting point means there is less chance for cracks to occur on the lamp at high temperature. Besides this we make our housing from a single piece of aluminium so the heat can spread away more easily. For one of our tests we triggered the lamp 1000x times at full power in 2s intervals using 8 batteries and it didn't go wrong.



#390537 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 26 December 2017 - 09:57 AM

I wonder if the FIX / upgrade to solve the TTL issue on the UWT circuitry be an easy fix?


Hi Barry, regarding the UW Technics TTL converter we are sure that in the future there will be better compatibility. At the moment no additional calibration was made on those converters to support the Retra Flash but I believe that this will change during next year.



#390528 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 26 December 2017 - 06:25 AM

Hi Everyone! 


Thank you for posting your reports and sharing your thoughts. It's really helping us understand where we need to improve and your positive feedback is very supportive. This underwater strobe would not be possible without your input!


We will continue working in this way and we look forward to keeping in touch. 


Our heartfelt thanks for your support and Happy Holidays!

#388319 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 11 October 2017 - 09:08 PM

After everything youve done certainly not. Weve fully + extra refunded you and youve shown no respect for what we are working hard to achieve.

#388312 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 11 October 2017 - 12:48 PM

Hi Allen, I guess it’s water under the bridge.

We’ll keep up the hard work and get the photographers, who are patiently waiting and being supportive of our efforts, the product we’ve been perfecting all this time.

Thank you all very much.

#388296 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 11 October 2017 - 08:24 AM

Hi Allen, we have refunded and additionaly compansated your order after we’ve received several negative emails from your group.
I understand the frustration of waiting and we wanted nothing else but send your order. Unfortunatelly you have bullied us into a corner and we replied.

We are now achieving more and more shipments each day and photographers who were so kind to be patient and supportive are already getting their rewards.

Our heartfelt thanks to everyone who gave us the positive thoughts to move forward.

Thank you

#388224 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 08 October 2017 - 01:36 AM

Hi Everyone, we've been able to send about 20% of pre-orders in the last two weeks. Now that we've gained some experience we can pick up the pace and hopefully get all strobes sent in the next 3-4 weeks. 


Thank you for your patience and support!

#387910 RETRA Strobe Thread

Posted by Oskar@RetraUWT on 25 September 2017 - 11:04 PM

Anyone getting shipping notifications yet?


Hi Everyone, the first two boxes are going out today!


We will gradually build up quantity for the first two weeks so I kindly ask for your patience. It will take 4-5 weeks before all pre-orders are sent and delivered.

Once your order is ready for shipping you will get an email with tracking details. All orders are shipped with DHL Express so they will get to you as soon as possible. 


Thank you all for your patience and support!