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INON D-180 Manual
Version 1. October 4, 2003
Copyright 2002, 2003 by INON America, Inc. All rights reserved.
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as a Slave Strobe, by reducing the amount of backscatter caused by light coming from
the camera’s internal strobe illuminating suspended particles in front of the lens,
enabling clearer, higher quality images.
The system (Patent Pending) was devised from the D-180’s design conception. First, a
“Clear Photo Filter” is placed over the camera’s flash. This filter blocks visible light,
only allowing non-visible wavelengths to pass though. Accordingly, there is no
visible light to illuminate the particles in front of the lens. The non-visible light is
picked up by a fiber optic cable and relayed to the strobe, triggering a flash output.
Clear Photo Film is included with Inon “Optical D Cable/Cap Sets” available for
various camera/housing systems.
5) Shutter Linked Auto-Off Focus and Target Light
The Focus and Target Light has many functions. First it shines light on the subject,
increasing contrast so both Manual and Auto Focusing are easier. Also, it helps aim
the strobe’s beam axis directly on the subject. Upon activating the Focus Light
Switch, the Focus Light will turn on, and upon sensing the camera’s internal strobe
flash, will automatically turn off so no light from the Focus Light is recorded in the
image. Also the Focus Light can be set to turn off automatically in about eight
seconds if the Focus Light Switch is not pressed again.
Reference No. 1 Automatic Flash Adjustment of External Strobes
When using external strobes, in order to automatically adjust the amount of flash output and
properly expose the subject, it is necessary to calculate and control the strobe’s flash duration (light
output amount / “intensity”) using the following information.
ISO sensitivity
Aperture Value
Reflectivity of the subject
Of this information, depending on the method of measurement and part of the subject being
measured for reflectivity, the methods of automatic flash output adjustment can be classified as
follows:
1) During exposure, the camera meters (measures) in real time
Subject reflectivity measured TTL (Through The camera’s Lens) in real time; strobe quenches
(turns off) at time of “proper” exposure. (Real Time TTL Auto Exposure Adjustment)
Using a light sensor on the camera, subject reflectivity is measured in real time; strobe
quenches at time of “proper” exposure. (Real Time Auto Exposure Adjustment)
2) Before exposure, camera meters (measures) a “pre-flash”
Camera’s internal strobe fires a small “pre-flash” to illuminate the subject. During pre-flash,