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Hello Pavel,

 

Referring to the TTL converter for Sony a7Rii to be released, fitting it to a Meikon case, can you recommend a retrofit to the single hole in the top of the case for fiberoptic cables to two strobes? Or would the case have to be modified for two optical bulkheads? Below are diagrams of the Meikon case hole that fits their standard sync bulkhead.

 

Thanks for any help.

 

post-77081-0-68200000-1557778765_thumb.jpg

post-77081-0-42065600-1557778800_thumb.jpg

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Posted (edited)

Hello Pavel,

Referring to the TTL converter for Sony a7Rii to be released, fitting it to a Meikon case, can you recommend a retrofit to the single hole in the top of the case for fiberoptic cables to two strobes? Or would the case have to be modified for two optical bulkheads? Below are diagrams of the Meikon case hole that fits their standard sync bulkhead.

Thanks for any help.

 

Yes, Meikon bulkhead has rather special shape mount. But there is no problem with it. For TTL-Converter usage, UWTechnics will suggest 3 optional bulkheads as replacement:

- Optical bulkhead / Sea&Sea style optical connector. For 2 strobes you can use HowShot Dual FO cable, for example, or another brand dual 613-core cable of new generation.

- Electric bulkhead / Nikonos style. For 2 strobes you can use Sea&Sea Dual sync cord.

- Electric bulkhead / Ikelite style. For 2 strobes you can use Ikelite Dual sync cord.

Edited by Pavel Kolpakov

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I received two Z330s today. It took 6 weeks to deliver.

 

And ignoring the warning in the instructions, they work fine in parallel via a Y sync cable,as Pavel and others have said they would.

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I just got a un technics converter today. Installation was easy.

 

I did a few test shots and they look good.

 

Odd, they recommend for the Em1 ii to set the flash compensation to +0.5, but I swear the camera goes from 0.3 to 0.7

Still it is cool to be able to + or - the light from the camera (I need to play with assigning a button for it.

 

I won't be able to play with the system in the water until my channel islands trip in August.

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Posted (edited)

I just got a un technics converter today. Installation was easy.

 

I did a few test shots and they look good.

 

Odd, they recommend for the Em1 ii to set the flash compensation to +0.5, but I swear the camera goes from 0.3 to 0.7

Still it is cool to be able to + or - the light from the camera (I need to play with assigning a button for it.

 

I won't be able to play with the system in the water until my channel islands trip in August.

 

I also love this TTL-Converter for Olympus cameras. New generation TTL product, everything is optimized there.

Can you show some underwater images with that TTL, after your dive trip?

Edited by Pavel Kolpakov

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Posted (edited)

I modified my a7Rii Meikon case for the dual fiberoptic bulkhead connector that comes with the Seafrogs a6xxx Salted Line case.  I'm hoping to interface the UW-Technics converter with it so I can keep the standard synch cable connector as well.

 

fiberoptic ports.jpg

Edited by davec13o2

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On 5/14/2019 at 6:22 AM, davec13o2 said:

Hello Pavel,

 

Referring to the TTL converter for Sony a7Rii to be released, fitting it to a Meikon case, can you recommend a retrofit to the single hole in the top of the case for fiberoptic cables to two strobes? Or would the case have to be modified for two optical bulkheads? Below are diagrams of the Meikon case hole that fits their standard sync bulkhead.

 

Thanks for any help.

 

post-77081-0-68200000-1557778765_thumb.jpg

post-77081-0-42065600-1557778800_thumb.jpg

If it takes standard S&S connectors just use a double hole bushing:  https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwj7kIOI7PnjAhXvH7cAHUvAAmkQFjAAegQIABAB&url=https%3A%2F%2Fwww.backscatter.com%2FInon-Double-Hole-Rubber-bushing-for-fiber-optic-ca&usg=AOvVaw2Cil2iynFGuZBkfJi4USIJ

There is also a right angle version available.

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Thanks Chris,

Since that posting, I've been using the adapter you show  in the right port of my Seafrogs a6500 case because the left side port doesn't get enough light diverted from the onboard flash to trigger a strobe reliably.  The commercial two-port plastic bulkhead adapter is all I could get for my a7Rii case.

I've also used the double hole bushing to relay trigger light to two strobes from a Nimar led trigger, and in that case neither strobe would trigger.  One strobe would trigger, although not reliably, with a single hole bushing, possibly because the fiberoptic cable was better aligned with the axis of the weak led.  These problems go away with both single and double hole bushings when used with the flood of light from the a6500 onboard flash.

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51 minutes ago, davec13o2 said:

I've also used the double hole bushing to relay trigger light to two strobes from a Nimar led trigger, and in that case neither strobe would trigger.  One strobe would trigger, although not reliably, with a single hole bushing, possibly because the fiberoptic cable was better aligned with the axis of the weak led.  These problems go away with both single and double hole bushings when used with the flood of light from the a6500 onboard flash.

Are you using single- or multi-core fiber optic cables? I've seen multiple recommendations to use multi-core cables (typically 613 strands) with LED triggers and/or less sensitive strobes because they transmit light more efficiently.

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I use the Howshot cables for Inon strobes from Diversion.  I assume they're multicore, but I haven't verified that.  I get the same results with Meikon cables and with unknown brands from China via ebay.

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I ran a pair of Z240's through a Sea&Sea Y cable without any issues before moving to optical connections. (I have a couple of Y cables and a couple of direct cables available if anyone wants to make me an offer)

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Posted (edited)
On 8/11/2019 at 2:17 AM, davec13o2 said:

I modified my a7Rii Meikon case for the dual fiberoptic bulkhead connector that comes with the Seafrogs a6xxx Salted Line case.  I'm hoping to interface the UW-Technics converter with it so I can keep the standard synch cable connector as well.

 

fiberoptic ports.jpg

Good job!  And good idea!

Please advice, where did you buy that transparent spare part? I also need it.

By the way, UW Technics is developing now TTL converter for Seafrog A6xxx housings. It's LED board is purposed for installation on this transparent part (inside the housing).  TTL converter has LED and Electric outputs, as usual. So, you could more easy use both type connectors (Optical/Electric) on your A7RIII housing, using that transparent part you has installed and Nikonos bulkhead simultaneously. 

Edited by Pavel Kolpakov

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Here are the dimensions I used for milling my case.  Note the shoulder that makes it a bit more complicated.

 

Plastic fo bulkhead dims.jpg

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I wanted to give a shout out to Pavel Kolpakov for his outstanding contributions on the Wetpixel forum and to me personally. I have been using the UW Technics TTL converter for a while now, but confess that I ditched TTL long ago and only shoot manual.

On trip to Fiji recently the converter froze with the LEDs on. The only way to turn them off was to remove the batteries, impossible underwater! Pavel guided me through at the time and with his advice I completed the trip without losing too many shots. On returning home I have still experienced the problem on most dives but turning the camera on and off usually solved it, until last weekend when it  froze up completely again.

I contacted Pavel again and have to say I was blown away by his assistance, which was almost immediate.

Pavel you are a true credit to the industry, it really is breath of fresh air to meet a person that is so willing to help and share their knowledge, and to resolve a technical issue when the need arises. The Wetpixel community are lucky to have you and I am truly grateful for your help.

Regards

John

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4 hours ago, JohnVila said:

Pavel you are a true credit to the industry, it really is breath of fresh air to meet a person that is so willing to help and share their knowledge, and to resolve a technical issue when the need arises. The Wetpixel community are lucky to have you and I am truly grateful for your help.

Regards

John

Add another vote to that. Pavel, you are just terrific. Don't go away. We need you!

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