Firefield FF12003 User manual
FF12003, FF12004 & FF12004T
FIREFIELD SIEGE MONOCULAR SERIES
USER MANUAL
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ABOUT FIREFIELD SIEGE MONOCULAR SERIES
The IP55 water resistant Fireeld Siege 8x32 Monocular gets you up close and personal with 8X magnication, fully multi-coated glass
and a 32mm objective lens designed for great light transmission and a crystal clear eld of view even when dusk sets in. Rubber armor
keeps this optic in great shape year after year. Includes lens covers, lens cloth, carrying case and lanyard.
The IP67 waterproof Fireeld Siege 10x50 Monocular gets you up close and personal with 10X magnication, fully multi-coated glass
and a robust 50mm objective lens designed for incredible light transmission and a crystal clear eld of view even when dusk sets in.
Rubber armor keeps this optic in great shape year after year while a ¼-20 bottom mount allows you to use the Fireeld Siege 10x50
Monocular as a compact, on-the-go spotting scope. Includes lens covers, lens cloth, carrying case and a lanyard.
The Fireeld Siege 10x50R Tactical Monocular makes for a user-friendly, exceptional viewing experience with its twist-up eyecup, range-
nding reticle, and internal focusing.
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Technical Specications FF12003 FF12004 FF12004T
Magnication (x) 8 10 10
Objective lens diameter
(mm)
32 50 50
Exit pupil diameter (mm) 4.6 / 15.4 .6 / 15.4
Eye relief (in/mm) .51 / 13 7 7
Field of view (degrees) 7.5 367.21 367.21
Field of view
(ft@1,000yds)
393 367 367
Close focus distance (ft/m) 16 / 5 13 / 4 13 / 4
Length (in/mm) 4.9 / 125 6.2 / 157 6.2 / 157
Width (in/mm) 1.8 / 45 2.2 / 56 2.2 / 56
Height (in/mm) 1.8 / 46 2.6 / 66 2.6 / 66
Weight (oz.) 8 15.2 15.2
TECHNICAL SPECIFICATIONS
FEATURES FF12003
• Fully multi-coated optics
• Roof prism optical system
• Straight eyepiece design
• Compact, lightweight design
• Twist-up eyecup
• Straight eyepiece design
FEATURES FF12004/FF12004T
• Fully multi-coated optics
• Internal focusing
• Rangending reticle*
• Roof prism optical system
• Straight eyepiece design
• Twist-up eyecup
• Built-in tripod adapter
• Waterproof and fogproof
*FF12004T only
INCLUDED ACCESSORIES
• Lanyards
• Lens covers
• Carrying case
• Lens cloth
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DIAGRAM FF12003
1) Eyepiece
2) Twist-up eyecup
3) Focus dial
4) Objective lens
5) Lanyard loop
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4
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5
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5
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DIAGRAM FF12004/FF12004T
1) Eyepiece
2) Twist-up eyecup
3) Focus dial
4) Tripod mount
5) Objective lens
6) Lanyard loop
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FOCUS ADJUSTMENT
The focus dial allows the Siege Monoculars to deliver a clear, sharp image. To focus the image:
1. Turn the focus dial (3) until the image is focused. Make sure the image is always well focused as this will prevent eye fatigue.
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ADJUSTING THE EYECUP
Prior to using the Siege monoculars, it is best to adjust the twist up eyecup to
your preference. The twist-up eyecups allow you to properly observe the full
eld of view of the image without any vignette effect or darkened edges. Even
if you wear eyeglasses you can use the Siege monoculars effectively. If you
wear glasses, keep the eyecup in the down position. Twist the eyecup to the
up position if you do not wear glasses. To twist the eye cups:
1. Rotate the eye cup (2) counter-clockwise to raise the eyecup.
2. Rotate the eye cup clockwise to lower the eyecup.
MOUNTING THE TRIPOD
All Fireeld Siege monoculars include a tripod that attaches to the built-in tripod mount. The built-in tripod mount also works with
most aftermarket tripods and window mounts. The built-in tripod mount can be used with any tripod or window mount that uses a
standard 1/4-20 UNC tripod screw. To mount the tripod:
1. Align the tripod’s mounting screw with the socket on the bottom of the tripod mount (4).
2. Screw the tripod’s mounting screw so that the tripod and the tripod mount are completely connected and rmly secured.
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USING THE RANGEFINDING RETICLE
The Fireeld Siege 10x50R Tactical Monocular uses a mil reticle. Mil stands for millra-
dian. A millradian is 1/6283.2th of a circle, or 3.438 MOA. The millradian represents
1 unit at 1000 yards. To simplify, a target that is one yard tall at 1000 yards would
measure 1 millradian. Each hashmark in the 10x50’s reticle is 5 mils.
Calulation Method
In order to determine distance there are three variables: target size, mils read, and range. In order to determine distance, the tar-
get size must be known. By using the reticle to measure target height the following calculation can be used to derive an estimated
distance.
Target size (in yards) x 1000 / Mils read = yards to target
For example, a full size deer is approximately six feet long. Convert feet into yards (3’ = 1yd), so the deer is 2 yards long. Now
measure the deer with the mil reticle; it is 10 mils long. Next, mulitply the target size (2 yards) by the constant of 1000. This
equals 2000. Now divide 2000 by mils read (10), this equals 200. So the deer is roughly 200 yards away.
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MAINTENANCE
Proper maintenance of the Fireeld Siege monoculars is recommended to ensure longevity. It is recommended that when the
monocular becomes dirty that it is wiped down with a dry or slightly damp cloth. Blow dirt and debris off all optics and then clean
lenses with a lens cleaning cloth. To remove oils or dried water spots, apply a small amount of denature alcohol to a lens cloth
or cotton swab. Clean the surface of the lens and let dry. Finally use your breath to clean the lens once more. To protect the
monocular store it in the protective padded case when not in use. No further maintenance is required. Do not attempt to disas-
semble any components of the monocular.
STORAGE
Cover with the objective lens and the eyepiece with the included lens covers. For long-term storage, place the monocular in a
cool, dry and ventilated area
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TROUBLESHOOTING
Proper authorization is required before shipping any product back to Fireeld. Failure to obtain authorization could result in your
product being returned to the wrong address, lost, or damaged. Fireeld is not liable for products returned without authorization.
The image is blurry and not in focus:
1. Rotate the focus dial until the image becomes clear and sharp.
2. Remove any dust or oil off the objective lens or eyepiece.
FIREFIELD WARRANTY
Please visit www.re-eld.com for warranty details and information.
WARNING
Before handling the Fireeld Siege monocular read and understand the contents of the Fireeld manual.
• Avoid hitting or dropping the unit
• NEVER look directly into the sun or at other bright light sources with the monocular as this could damage your eye and cause
blindness.
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NOTES
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NOTES
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NOTES
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