INON D-180 ManualVersion 1. October 4, 2003Copyright 2002, 2003 by INON America, Inc. All rights reserved.13as a Slave Strobe, by reducing the amount of backscatter caused by light coming fromthe 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 novisible light to illuminate the particles in front of the lens. The non-visible light ispicked 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 forvarious camera/housing systems.5) Shutter Linked Auto-Off Focus and Target LightThe 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 aimthe strobe’s beam axis directly on the subject. Upon activating the Focus LightSwitch, the Focus Light will turn on, and upon sensing the camera’s internal strobeflash, will automatically turn off so no light from the Focus Light is recorded in theimage. Also the Focus Light can be set to turn off automatically in about eightseconds if the Focus Light Switch is not pressed again.Reference No. 1 Automatic Flash Adjustment of External StrobesWhen using external strobes, in order to automatically adjust the amount of flash output andproperly expose the subject, it is necessary to calculate and control the strobe’s flash duration (lightoutput amount / “intensity”) using the following information.z ISO sensitivityz Aperture Valuez Reflectivity of the subjectOf this information, depending on the method of measurement and part of the subject beingmeasured for reflectivity, the methods of automatic flash output adjustment can be classified asfollows:1) During exposure, the camera meters (measures) in real timez 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)z Using a light sensor on the camera, subject reflectivity is measured in real time; strobequenches at time of “proper” exposure. (Real Time Auto Exposure Adjustment)2) Before exposure, camera meters (measures) a “pre-flash”z Camera’s internal strobe fires a small “pre-flash” to illuminate the subject. During pre-flash,