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FORUMS General Gear Talk Flash and Studio Lighting
Thread started 20 Nov 2017 (Monday) 10:41
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Flash Sync Issue

 
dmward
Cream of the Crop
Joined Jun 2009
Metro Chicago
Nov 22, 2017 18:20 |  #16

Wilt wrote in post #18501371 (external link)
It has to be admitted that if light goes 186000 miles/sec. that changing distance from 10' to 1' is only the matter of 1/1,000,000,000 th of a second vs. 1/100,000,000 the of a second. Even increasing distance to 100' means that it still needs only 1/10,000,000 th of a second for the signal to travel between transmitter and receiver.
If there is an issue caused by short distance, it is most likely the fact that the increase of signal strength overwhelmed the receivers' dynamic range, and the receiver has gone into saturation.

So needing to slow down shutter from 1/200 to 1/160 or 1/125 is caused by A + C, not B.

Talk to an RF engineer about propagation anomalies. Its not the time, its the integrity of the signal. A and C will have more or less known delays considering firmware design and protocol translation algorithms. The unknown is the radio wave in the air. At least that's what RF engineers have repeatedly told me when I've asked about similar technology changes in a telecommunications system. WiFi in one's house is an example we all deal with.


David | Sharing my Insights, Knowledge & Experience (external link) | dmwfotos website (external link)

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TooManyShots
Cream of the Crop
10,122 posts
Joined Jan 2008
NYC
Dec 28, 2017 18:23 |  #17

The Yongnuo RF603II can sync at 1/320s wirelessly....


One Imaging Photographyexternal link and my Flickrexternal link
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Angmo
looks like I picked a bad week to give up halucinagens
Angmo's Avatar
Joined Dec 2015
AZ-USA
Post has been edited 24 days ago by Angmo.
Dec 28, 2017 20:34 |  #18

Also... keep the electrical contacts clean on your hot shoe and camera. Once in a while, I’ll use an eraser to keep them clean-n-shiny. Tighten down on the contacts a bit. Don’t leave them connected loose. Keeps them from slipping out anyway


Nikons, Rolleiflexes, Elinchroms

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dmward
Cream of the Crop
Joined Jun 2009
Metro Chicago
Dec 29, 2017 10:11 |  #19

Angmo wrote in post #18528340 (external link)
Also... keep the electrical contacts clean on your hot shoe and camera. Once in a while, I’ll use an eraser to keep them clean-n-shiny. Tighten down on the contacts a bit. Don’t leave them connected loose. Keeps them from slipping out anyway

And the looser connections add a bit of additional resistance in the circuit.

The 1/320th with the 603 trigger is a combination of good radio and the fact that a slight curtain shadow at the edge of most images is not noticeable unless its a very bright portion of the image.


David | Sharing my Insights, Knowledge & Experience (external link) | dmwfotos website (external link)

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Flash Sync Issue
FORUMS General Gear Talk Flash and Studio Lighting


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