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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 04 Sep 2015 (Friday) 09:03
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Flash Duration info for Jinbei HD600 V & Rovelight 600B

 
OceanRipple*
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Post edited over 3 years ago by OceanRipple*. (4 edits in all)
     
Sep 04, 2015 09:03 |  #1

Hi, The Jinbei HD 600 II & V and the Rovelight 600 B are currently quite popular. Apart from their portability, it's their functionality with focal plane shutters used above their usual max sync speed that has caught people's attention. My unit under test is an HD 600 V.

I was keen to find out exactly what was happening in terms of flash duration when the units are operating both in normal mode and in "H" mode. (Note; scales may differ.)

Full power under both control modes, upper traces are 'Normal', lower are "H":


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OceanRipple*
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Sep 04, 2015 09:05 |  #2

.. and for Half power ..


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OceanRipple*
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Sep 04, 2015 09:06 |  #3

.. and Quarter power ..


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OceanRipple*
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Post edited over 3 years ago by OceanRipple*.
     
Sep 04, 2015 09:11 |  #4

.. please check the scales carefully .. (when it comes to electronics, I'm a 'Proto Newbie' . . . )

Still it's obvious that the durations under H are very much longer than under normal mode. That is as expected - it looks as though control in normal mode is IGBT style whereas under "H" it may be 'Variable Voltage' control.

So, I would advise strongly against leaving the unit in H mode except when that feature is specifically called for.




  
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OceanRipple*
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Post edited over 3 years ago by OceanRipple*. (3 edits in all)
     
Sep 04, 2015 09:23 |  #5

Another wrinkle ..

When in Normal mode, the power control tech seems to change at around 1/8th power. On my unit, the increments become somewhat non-logarithmic at 1/8th power - with 1/8th being c 1/3rd of a stop below that expected. This flash-meter confirmed finding is (IMO) supported by:

Note, in this pair the Y axis scale is unchanged. Upper trace is 1/4 and the lower trace is 1/8th as set on the unit. The area under the lower curve is not half of that under the upper curve.

However, this is at least predictable & reproducible - so I'm not too worried, at this price point.


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nixland
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Sep 04, 2015 10:45 |  #6

Thanks a lot. This is what I am looking for. :)

If you have a chance to do the same with Profoto B1, Phottix Indra and speedlite, it would be awesome :)




  
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OceanRipple*
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Post edited over 3 years ago by OceanRipple*. (9 edits in all)
     
Sep 04, 2015 11:09 as a reply to  @ nixland's post |  #7

Hi, I don't have access to either a B1 nor an Indra, (I believe that the Indra does 40-50KHz pulsing) but good Speedlite info is avaiable here:

http://gock.net …-durations-small-strobes/ (external link)

my data for a 580ExII was very similar to that for his 580 (original) except that at 1/1 (non HSS) the flash was curtailed at 5.52 ms.

T0.1 times for Jinbei HD600V:
In 'H' mode they are intentionally long @ c 1/125th sec.

In Normal mode (approx, provisional & rounded to slower):
1:1 1/200th
1:2 1/820th
1:4 1/1600th
1:8 1/1600th
1:16 1/2900th
1:32 1/2900th
1:64 1/3500th
1/128 1/5000th

IOW AFAICS it is not solely IGBT tech going on here - note the steps etc.


Speedlite HSS at full power looks like this:


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nixland
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Sep 06, 2015 02:57 |  #8

OceanRipple* wrote in post #17694854 (external link)
Hi, I don't have access to either a B1 nor an Indra, (I believe that the Indra does 40-50KHz pulsing) but good Speedlite info is avaiable here:

http://gock.net …-durations-small-strobes/ (external link)

my data for a 580ExII was very similar to that for his 580 (original) except that at 1/1 (non HSS) the flash was curtailed at 5.52 ms.

T0.1 times for Jinbei HD600V:
In 'H' mode they are intentionally long @ c 1/125th sec.

In Normal mode (approx & rounded to slower):
1:1 1/200th
1:2 1/820th
1:4 1/1600th
1:8 1/1600th
1:16 1/2900th
1:32 1/2900th
1:64 1/3500th
1/128 1/5000th

IOW AFAICS it is not solely IGBT tech going on here.


Speedlite HSS at full power looks like this:
thumbnail
Hosted photo: posted by OceanRipple* in
./showthread.php?p=176​94854&i=i43428775
forum: Flash and Studio Lighting

That' cool. Thanks.

I want to draw 2 vertical line on the chart for the shutter opening time and closing time but I still can not found what is the duration time of shutter opening on full frame and apsc. I only know that the smaller sensor is faster. Hypersync test on my apsc show almost no gradation/fall off while on my ff the fall off is obvious :)




  
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OceanRipple*
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Post edited over 3 years ago by OceanRipple*. (3 edits in all)
     
Sep 06, 2015 09:02 as a reply to  @ nixland's post |  #9

Yes, there was a Youtube clip about shutter opening but I don't recall if they factored in flash sync. PW did some work on optimizing the various intervals but I didn't see any published times. I use Odins but have not yet played around with ODS. Even without ODS, just using 'H-lightening bolt' timing on my Odin TCU, with a 5DIII, and the Jinbei set to 'H', I get a useably even frame. Although the power captured takes a hit, the 600 starts with plenty.

(Edit: I'm going to be off the grid for a couple of weeks.)




  
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nixland
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Sep 06, 2015 23:08 |  #10

If you could, please capture the 580II at full power in normal mode and in hss mode witj the same Y axis scale.

Also in hss mode at 1/2 power. With same y axis scale too.
Thanks




  
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OceanRipple*
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Sep 07, 2015 02:37 as a reply to  @ nixland's post |  #11

580ExII
Normal 1:1


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OceanRipple*
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Sep 07, 2015 02:38 |  #12

580ExII
HSS 1:1


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OceanRipple*
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Post edited over 3 years ago by OceanRipple*.
     
Sep 07, 2015 02:39 |  #13

580ExII
HSS
1/2
.
The Cursors tell you the times in ms.
(Sorry, I'm away now, c 2w. Cheers)


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nixland
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Sep 07, 2015 05:32 |  #14

Wow, that's super cool. Thanks a lot.




  
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OceanRipple*
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Oct 15, 2015 12:54 |  #15

I've had some inquiries about how I tested the durations. Tx to Andy Gock, see:
http://gock.net …-durations-small-strobes/ (external link)

. . I just tried to follow his suggestions. I know next to nothing about electronics, but had some fun with a borrowed oscilloscope. Like:


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Flash Duration info for Jinbei HD600 V & Rovelight 600B
FORUMS General Gear Talk Flash and Studio Lighting 
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