Ikelite DS51 II User manual

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DS51 II 50ws TTL Strobe
Product Number 40051

2
About this Product
Thank you for your purchase of Ikelite equipment. Please read this
instruction manual completely before attempting to operate or dive
with this product. Please visit ikelite.com to register your product
to receive information on any updates or notices pertaining to your
equipment.
Included in the Box
• DS51 II strobe
• Diffuser # 0561.2
• Bulkhead cap # 9104.7
• 1” Ball Mount # 4081.4
• Silicone lubricant 1cc tube
• 2 year manufacturer warranty

3
Specifications
Weight ....................................................0.6kg (1.3 lbs) with batteries
Energy Rating ........................................50 watt-seconds
Coverage Angle ....................................70° (80° with diffuser)
Guide Number (ISO 100) feet ...............56 surface
Guide Number (ISO 100) meters ..........17 surface
Firing Modes ..........................................TTL, Full, -0.5, -1, -1.5, -2,
-2.5
Color Temperature .................................5700K
Power Source ........................................4 AA
Flashes ..................................................200 full power
Recycle Time..........................................3.5 seconds (full power)
Depth Rating ..........................................90 meters (300 feet)
CE - Compliant with applicable EU directives
Complies with FCC part 15, subpart B, Section 15.109 for Class “B”
Products

4
Important Notices
»To prevent salt build-up and sticking controls, submerge the
strobe in clean, freshwater. Operate the knobs several times
each while underwater to ush out any residue.
»Do not use cleaning agents, spray lubricants, Rain-X, or
other solvents on strobe. Use of an incompatible chemical
compound can damage the plastic and o-rings, and may result
in leaking.
»The DS51 bulkhead connector is not waterproof and must
be capped when not connected to a cord or sensor. Using a
DS51 underwater with the bulkhead connector uncapped or
unconnected will cause the strobe to ood.
»The strobe is factory sealed; do not disassemble. Disassembly
will void your Ikelite DS51 limited warranty.
»Do not continuously re the strobe more than 15 times above
water in rapid succession. If this does happen, allow the
strobe to cool down for at least 10 minutes.
»Lithium-ion batteries are NOT recommended.

5
Contents
Product Registration 1
About this Product 2
Included in the Box 2
Specications 3
Important Notices 4
Getting to Know Your Strobe 7
Mounting the Strobe 8
Ikelite Arm/Mounting System 8
Attaching a Sync Connector 9
Battery Compartment 10
Installing Batteries 10
Strobe Ready Light 11
Power/Exposure Dial 11
OFF position 11
TTL/Auto Exposure Position 12
Manual Exposure Position 12
Strobe Diffuser 13
Using the Diffuser 13
Diffuser Installation and Removal 13
Maintenance 14
Post-Dive 14
Post-Travel and Storage 14
Troubleshooting 15
Photos are over-exposed (too light) 15
Photos are under-exposed (too dark) 15
Strobe will not re 15
Strobe will not re when using sync cord 16
Strobe will not re when using an optical sensor 16
Ready light does not come on 16

6
Compartment Flooding 17
Limited Warranty 17
Service and Repairs 18
Contact Us 18

7
Getting to Know Your Strobe
ikelite
Knob Battery Door Power/Exposure Dial
Strobe Ready Light
Waterproof
Bulkhead
Cap
Bulkhead
Connector
Flashtube
Mount

8
Mounting the Strobe
Ikelite Arm/Mounting System
A 1-inch diameter ball mount is included which will allow attachment to
1-inch diameter ball arms from Ikelite, TLC, Ultralight, Nauticam, and
others. The ball mount may be removed for attachment of the optional
Flex Arm (sold separately). For more information, visit ikelite.com.
Ball Arm (not included)
Ball Mount

9
Attaching a Sync Connector
»A bulkhead cap or waterproof connector must be attached
to the strobe for waterproof operation. Never submerge the
strobe without either a bulkhead cap or compatible waterproof
connector attached.
1. Remove the bulkhead cap.
2. Lightly lubricate the connector O-ring. We recommend using only
Ikelite silicone lubricant to eliminate the possibility of swelling due to
incompatible compounds.
3. Line up the pins and receptacles and insert the Sync Cord Plug into
the bulkhead. The plug should slide easily into the bulkhead. If you
feel resistance, do not force it. Remove the plug and check
alignment.
Sync Cord Plug
Connector O-ring
Bulkhead Waterproof
Bulkhead Cap
4. Rotate the knurled retaining ring until snug on the housing
bulkhead. Do not use pliers or tools to tighten the retaining ring.

10
Battery Compartment
Installing Batteries
1. Rotate the strobe switch to the OFF position.
2. To access the battery compartment, rotate the knob counter-
clockwise several times and gently pull the door off.
3. Install four AA-cell batteries (alkaline, NiCad, or NiMH). Refer
to the “+” and “ – “ markings in the battery compartment to help
properly install the batteries. If the batteries are installed incorrectly,
it may damage the strobe’s electronics.
4. Check that the o-ring and sealing surfaces are clean. Make sure
the o-ring is in the groove and free of dirt or debris. We do not
recommend removing the o-ring from the groove or lubricating the
o-ring.
5. Replace the battery door. Make sure the door ts into the recess
around the battery compartment.
6. The o-ring seal will be visible through the battery door as the door
is attached. Rotate the thumbscrew until a solid black line forms.
Do not over-tigthen.
»Do not use lithium batteries.