Eltima electronic Jokie 2 User manual

User's Manual

light barrier

Ver: 1.0.3

Description of components

velcro tape

tripod socket

infrared

transmitter

camera socket

operating mode switch

80 mm reflector

DC-plug

battery case

40 mm reflector

receiver

DC-plug

potentiometer

light barrier

Content

Description of components.................................................3

Content..............................................................................4

Intro uction.......................................................................5

Intended purpose..................................................................5

Symbols...............................................................................5

Maintenance and storage........................................................5

Quick Start.........................................................................6

Getting started......................................................................6

Functional concept.............................................................7

Reflex light barrier.................................................................7

The light beam......................................................................8

Reflectors.............................................................................9

Sensitivity..........................................................................10

Operating mo es..............................................................11

Reach and sensitivity...........................................................11

Release delay, lag time........................................................14

Thunderstorm photography...................................................15

Detecting projectiles............................................................15

Keep-active mode................................................................16

Wake-Up............................................................................16

Taking pictures with Jokie²..............................................17

Setup and alignment of the light barrier.................................17

Setup.................................................................................17

Alignment of the light barrier................................................17

Finding the midpoint of the reflector......................................18

Connecting the camera.........................................................18

Important camera settings....................................................18

Auto-focus..........................................................................18

Aligning the camera towards the camera and the subject.........19

Focal plane parallel to light beam..........................................19

Focal plane parallel to flight path...........................................20

Using the geometry of the subject.........................................20

Working with the sensitivity of the light barrier.......................21

Taking pictures of small objects.............................................21

Blanking out of smaller objects..............................................21

Taking pictures without reflectors..........................................22

Connections.....................................................................23

Camera connection..............................................................23

Power supply......................................................................23

Specifications...................................................................24

Type..................................................................................24

Measurements.....................................................................24

Weight...............................................................................24

Power supply......................................................................24

Power consumption..............................................................24

Service life with one set of batteries......................................24

Reach................................................................................24

Response time....................................................................24

Scope of delivery.................................................................24

Notes...............................................................................25

4© eltima electronic 2013

Intro uction

Introduction

Dear client,

thank you for purchasing our light barrier . For you,

being an ambitious photographer, it shall be a reliable tool

that is both handy and easy to operate.

Please do not hesitate to contact us if you should miss

anything or have further improvement proposals. Only like

this the product will be able to develop to fully meet your

requirements.

Please read this manual carefully before using the light

barrier. It is supposed to get you familiar with operating

the system and all its functions. In this way you will be

able to use all the advantages offers.

Inten e purpose

This light barrier was solely built to release photo-

graphic cameras, flashes and filming devices. Please do

only use it for this purpose!

Symbols

Symbol for tips concerning the handling of the de-

vice.

Important advice concerning the function of the de-

vice.

Important advice to prevent damage of the device or

connected devices.

Maintenance an storage

• is not waterproof and therefore neither suitable

for use in rain nor under water. Please contact the man-

ufacturer immediately in case it should get wet. Water

drops can be wiped off with a dry cloth.

•Do not drop it or expose it to shocks.

•This device is a precise electrical/optical system. Do not

try to make alterations yourself.

•Please remove the batteries in case you should not use

the device for some time. This will prevent any leaking

of the batteries.

•Please clean the lenses occasionally with a soft cloth.

Quick Start

Getting starte ...

•Insert four batteries or accumulators into the battery re-

tainer.

Please observe the correct polarity, which is shown

at the bottom of every battery compartment.

•Put switch 2 of the mode switch to ON,

all others to OFF.

•Turn the potentiometer left until the end

stop.

•Install the light barrier and the 40mm reflector on one

tripod each.

•Plug the DC-plug in the DC-plug of the light barrier. At

this point the ED will shine green.

•Plug the 2.5mm jack plug of the camera adapter unit

(adapter unit available as accessories) into the camera

socket.

•Position the light barrier and the reflector opposite to

each other at a distance of 60 – 80 cm.

Note: This distance is chosen randomly and it is

neither the shortest nor the largest possible dis-

tance between camera and reflector.

•Align the infrared beam towards the reflector until the

ED goes out. The light barrier is ready for use now.

•Plug the other end of the camera adapter unit into the

remote control socket of your camera.

•Switch the auto focus of your camera to “manual“.

•Move your hand or another object through the light

beam. The camera will be released.

6© eltima electronic 2013

Image 1: Battery case

Image 3: mode

switch

Image 4: Setup

ca. 60 – 80 cm

Image 2:

polarity marking

Functional concept

Reflex light barrier

The light barrier is build according to the principle of

a reflex light barrier. Sender and receiver are in the same

housing.

The IR-transmitter emits an infrared light pulse train,

which is reflected by a reflector and thus thrown back to

the receiver.

If an impulse is missing or is received very weak, for ex-

ample because an object is in the way of the light beam,

an electrical switch is closed and the connected device is

released.

This principle of function offers several advantages. First of

all only one device, the light barrier itself, needs power

supply, the other side, the reflector, is passive.

In addition the latter is very solid and easy to handle, at-

tach and camouflage. Furthermore it is possible to use any

object as reflector, for example also the subject itself.

So, in some cases, the light barrier can also be operated

without reflectors.

Image 5: reflex light barrier

Image 6: ight beam is interrupted

Functional concept

The light beam

As described above the light barrier emits quickly succes-

sive invisible infrared light impulses, which are reflected by

a reflector and get back to the receiver. The latter expects

a certain minimum amount of the emitted light back for

each impulse.

While using the light barrier with a reflector, the received

amount of light is above a fixed threshold and the ED is

off. If the amount of light is below the threshold because

an object weakens the light beam or one impulse is miss-

ing since a large object is in the way of the beam, the ED

lights up and the connected device is released.

Due to the sending- and receiving characteristics of the

optical components, combined with the reflection charac-

teristics of the reflectors, the working distance between

the light barrier and the reflector can be roughly divided in

three sections.

The green middle section is the “normal“ working area of

the light barrier. Depending on the reflector used and the

working distance, one can assume a diameter of the beam

of 3-5 mm. The objects to be detected be the light barrier

need to meet and interrupt this beam. The small diameter

brings a very precise and repeatable switching point of the

light barrier.

The sensitivity of the system is highest in the green area.

In the orange area, closer to the reflector, the sensitivity

decreases and it's not sure that smaller objects will be de-

tected.

In the blue area that is close to the light barrier objects

may work as reflectors themselves. Therefore its is possi-

ble that a bright, well reflecting object may reflect the light

better than a reflector that is far away. As a result of that

the threshold value mentioned above is not undershot and

thus the light barrier not released, although an object is

positioned in the light beam. For that reason the light bar-

rier should be set up so that the object do preferably not

move through the blue area.

Consequently the light barrier can be operated without a

reflector in the blue area, which may be a great advantage

in some cases. The reach of the light barrier then depends

basically on the size and the reflection characteristics of

the object, see section Taking pictures without reflectors.

8© eltima electronic 2013

Image 7: Sections of the light beam

Functional concept

Reflectors

Two retroreflectors are included in the scope of delivery of

the light barrier . They consist of a circular plate with

many honeycombed

triple prisms.

One characteristic of

triple prisms is that they

reflect light back into

the direction it came

from, shifted for an

edge length. Image 8

shows the principle of

function of a single

triple prism.

Due to this characteristic a retroreflector does, in contrast

to plane mirrors, not have to be aligned exactly into the

direction of the light barrier. It is totally sufficient when it

looks roughly towards the latter. Solely for reaching the

maximum working distance the reflector should be aligned

precisely.

Image 8: Triple prism

Functional concept

Sensitivity

It is the sensitivity that determines how big an object has

to be at the least in order to be detected by the light barri-

er. Working with high sensitivity, very small objects can be

captured, with lower sensitivity, only larger objects will be

registered and smaller ones remain unnoticed.

In the case of the light barrier the sensitivity cannot

be adjusted. Nevertheless it can be influenced by the

choice of reflector, working distance and transmission

power of the IR-emitter.

The smaller the reflector, the less light will be reflected

and returned to the receiver, see section Reflectors. When

less light gets back to the receiver, the amount of light is

the closer to the threshold value. Then already a fairly

small object will be enough in order to weaken the light

beam to such an extent that the amount of light will be

below the threshold value.

The larger the working distance, the more light intensity is

lost before getting back to the receiver and therefore the

amount of received light is closer to the threshold. Here a

small object will be enough as well in order to weaken the

light beam so that the amount of light will fall below the

threshold value.

The less light is emitted by the IR-sender, the less will be

returned to the receiver and thus the smaller the objects

can be and still bring about a release of the camera.

Facit: The smaller the reflector is, or the larger the

working distance or the smaller the transmission

power of the IR sender, the higher the sensitivity

is.

The other way around, the larger the reflector is, or

the smaller the working distance or the larger the

transmission power of the IR sender, the lower is

the sensitivity of the light barrier.

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