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The Extended User Guide can be found at
www.irixlens.com
Thank you for choosing our product. Your new
product has been designed with the combined
eort and experience of engineers and
photographers. We have created it using the
best available materials, technology and
solutions, making it a perfect tool for both
professionals and hobbyists.
Irix 11 mm f/4.0 is an ultra wide-angle, rectilinear
manual lens designed for full frame DSLR
cameras.
[1] FRONT LENS CAP
The front lens cap protects the front lens. The cap
should remain attached whenever the lens is not
being used.
[2] LENS HOOD
Irix 11mm f/4.0 comes with a built-in lens hood that
cannot be detached.
The lens hood blocks the incoming light,
preventing glare and lens are, which may
decrease contrast and cause light reections in
the image.
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[3] FOCUS SCALE CALIBRATION
The focus scale calibration ring can be found under
a detachable cover and provides access to the rings
adjusting the focus scale position.
Only experienced users and Irix customer
service sta should use this function.
Detailed information about the focus scale cali-
bration procedure can be found in the Extended
User Guide.
[4] FOCUS LOCK RING
The focus ring lock lets you lock the focusing ring in
a chosen position.
To lock the focus ring, rotate the focus ring lock
left until you can feel a noticeable resistance.
To unlock it, rotate the focus ring lock all the way
to the right.
Any attempts to forcibly rotate the focus ring
when it remains locked by the focus ring lock
may permanently damage the lens.
[5] FOCUS RING
The lens is not equipped with any autofocus system.
To focus on a given subject, observe the image
through the viewnder or on the camera screen,
and adjust it manually by rotating the focus
ring. You can also use the distance scale (in feet
or meters) on the lens body to calculate the
distance to the chosen subject to be captured on
a photograph.
When the ring is set in the “innity” position, you
will hear a noticeable “click”, making it easier to
nd the value without looking.
Details regarding the hyperfocal and focus depth
scales can be found in the Extended User Guide.
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[6] GELATIN FILTER SLOT
The lens design allows the use of gelatin lters,
which are inserted into the slot on the back of the
lens.
Instructions on how to cut the lters out can be
found in the Extended User Guide.
Exercise caution when inserting the lter and do
not touch the lens or electrical contacts
around the bayonet. Do not use lters with
dierent dimensions than those described in the
Extended User Guide.
[7] LENS MOUNT
The process of attaching the lens to the camera
is described in the camera’s user manual and is
dierent for various systems.
The marker (dot) on the lens body facilitates the
process of mounting the lens onto the camera.
[8] REAR LENS CAP
The rear lens cap protects the lens during transport
and should be in place whenever the lens is not
attached to the camera.
APERTURE CONTROL
The lens aperture is operated electronically
through the camera. Detailed information
regarding aperture operation can be found in the
camera’s user manual and can dier for various
systems.
LENS POUCH & HARD LENS CASE
To better protect your lens against dust and
scratching, you should store it in a pouch or hard
lens case. Remember, however, that a pouch and
hard lens case do not ensure 100% protection
from water, falling, or shock.
MAINTENANCE
The lens elements have antireective coating and
are dirt-resistant, but they are not scratch-proof.
Use only cleaning agents intended for optics.
Larger impurities should be removed rst with
compressed air or a clean soft brush.
WARNINGS
The lens is equipped with a seal to protect the
interior from dust and moisture. It is not,
however, completely waterproof.
Do not submerge it in water or store it for
extended periods of time in humid places. To
achieve better water-tightness, it is advised to
use the front protective lter.
Protect the lens against shock, falls, and exces-
sive vibrations.
Do not leave the lens in direct sunlight, as
a focused light beam may cause re.
Do not expose the lens to high temperatures.
Do not look through the lens at the sun or in its
general direction, as that may cause permanent