Comments on: Nikon CLS Advanced Wireless Lighting, Part III

By: picmax

picmax — Tue, 24 Nov 2009 13:32:36 +0000

My understanding is the same. What matters is if there is a pulse at given time interval, not the width of the pulse itself.

Ch 4 is more like 150us, 375us, i.e. 1x, and 2.5x.

Thanks for your comment.

Max

By: GrzesiekN

GrzesiekN — Tue, 24 Nov 2009 08:17:19 +0000

My English is very poor, but informations will be very usefull Because transmission is flash dependent, pulse width has no meaning. Only egde of single pulse can be detected. Channel (header in my opinion) is coded by two first impuls as follow:
CH1: 150us,225us (us meaning microsecond)
CH2: 255us,150us
CH3: 255us,225us
CH4: 150us,350us
Rest of transmission has diffrent coding method. Pulse is always multipy of 150us. What this mean? If pulse length:
150us binary result is [1], 300us [10], 450us [100], 600us [1000] …

By: picmax

picmax — Sun, 15 Nov 2009 06:39:14 +0000

Russ,

Perhaps the 4th post of the series can answer your question.

http://dptnt.com/2009/11/nikon-cls-advanced-wireless-lighting-part-iv/

Max

By: picmax

picmax — Thu, 12 Nov 2009 14:43:28 +0000

Russell,

I am not sure at this point. I need to conduct some more tests. If I can decode the final output amount data, the conclusion will be obvious.

Thanks.

Max

By: Russell MacDonald

Russell MacDonald — Wed, 11 Nov 2009 17:16:00 +0000

Great information! I’m looking forward to the rest of the study.

One thing I still can’t understand is, when there are multiple groups, when are the preflashes analyzed by the camera?

Does the camera analyze all the data from the various groups at the same time, or does it analyze each group individually without reguard for the other groups?

Thanks!

Russ