Irix 15 mm f/2.4 Extended User Manual
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Irix 15 mm f/2.4 Extended User Manual

An ultra-wide-angle, rectilinear, manual focus lens, designed for full-frame dslr cameras. it is also compatible with many crop-sensor models
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Extended User Manual
Irix 15 mm f/2.4

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Summary of Contents for Irix Irix 15 mm f/2.4

  • Page 1 Extended User Manual Irix 15 mm f/2.4...
  • Page 2 -art technologies and cooperation, our team has created an excellent tool for both professional and amateur photographers. The Irix 15 mm f/2.4 is an ultra-wide-angle, rectilinear, manual focus lens, designed for full-frame DSLR cameras. It is also com- patible with many crop-sensor models.

  • Page 3: Table Of Contents

    Extended User Manual – Irix 15 mm f/2.4 TABLE OF CONTENTS FRONT LENS CAP FRONT FILTER THREAD LENS HOOD FILTER WINDOW FOCUS SCALE CALIBRATION FOCUS RING LOCK FOCUS RING DEPTH OF FIELD SCALE HYPERFOCAL SCALE REAR GELATIN FILTER SLOT HOW TO ATTACH THE LENS TO THE CAMERA...

  • Page 4: Front Lens Cap

    Extended User Manual – Irix 15 mm f/2.4 FRONT LENS CAP The front lens cap protects the front lens element from possible contamination and impact damage. The cap should always be attached when the lens is not in use. To attach or remove the front cap, hold the lens...

  • Page 5: Front Filter Thread

    Extended User Manual – Irix 15 mm f/2.4 FRONT FILTER THREAD Your Irix lens can accept 95 mm screw-in filters via the front threads. Due to the wide angle of view, the use of “slim” filters is advisable to prevent vignetting.

  • Page 6: Lens Hood

    Extended User Manual – Irix 15 mm f/2.4 LENS HOOD The removable and reversible lens hood helps prevent unwanted sidelight from the sun or other sources from entering the lens. It also helps pro- tect the lens from accidental impact damage. We recommend having your lens hood attached at all times.

  • Page 7: Filter Window

    Extended User Manual – Irix 15 mm f/2.4 FILTER WINDOW The filter window in the lens hood provides access to the edge of filters that rotate, such as circular polarizers, graduated filters and variable ND fil- ters. This feature allows you to adjust those filters without removing the lens hood.

  • Page 8: Focus Scale Calibration

    Extended User Manual – Irix 15 mm f/2.4 FOCUS SCALE CALIBRATION You Irix lens has been engineered to exacting stan- dards. The focus scale is factory calibrated and should be accurate. In some cases, however, you may find that the infinity mark on your lens does not correspond to the optimum focus setting for distant objects.

  • Page 9: Focus Ring Lock

    Extended User Manual – Irix 15 mm f/2.4 FOCUS RING LOCK The focus ring lock allows you to fix the focusing ring in a selected position. This innovative feature helps prevent accidental movement, resulting in focus shift. You may want to use the focus lock during long exposures, time-lapse imaging, or whenever re- petitive shots are called for.

  • Page 10: Focus Ring

    Your Irix lens allows you to set the focus at infinity without the need to look at the scale. While rotating the focus ring, infinity is indicated by a click and a definitive stop in the rotation.

  • Page 11: Depth Of Field Scale

    Extended User Manual – Irix 15 mm f/2.4 DEPTH OF FIELD SCALE The depth of field scale provides a visual reference for the range of maximum sharpness in your pho- tos at a given aperture and focus setting. It allows you to determine the plane of focus, within which objects in your image will be at their sharpest.
  • Page 12 As this demonstrates, it would be virtually impos- sible to provide legible marks on the DoF scale for this aperture setting. DoF scales are only useful for a smaller aperture setting (higher f/number). In the case of your Irix 15 mm lens, the lowest number represents f/8.
  • Page 13 Extended User Manual – Irix 15 mm f/2.4 DEPTH OF FIELD SCALE ExAMPLE NO 2 In this image, the focus setting remains the same as the first example, while the aperture setting is changed to f/8. Consulting the DoF scale, we can now use the two numerals “8”...
  • Page 14 Extended User Manual – Irix 15 mm f/2.4 DEPTH OF FIELD SCALE Przykład 3 Next, the aperture setting is decreased to f/16, without changing the focus setting. This smaller aperture will increase the DoF. You can see the increased plane of focus in the image.

  • Page 15: Hyperfocal Scale

    Extended User Manual – Irix 15 mm f/2.4 HYPERFOCAL SCALE In landscape, travel and similar types of photo- graphy, it’s often beneficial to maximize the depth of field in your images. This is best accomplished by setting your focus at the closest point of sharp focus for the chosen aperture setting.
  • Page 16 Extended User Manual – Irix 15 mm f/2.4 HYPERFOCAL SCALE Your Irix lens includes an innovative feature that allows you to quickly focus your lens at the hyper- focal distance for apertures of f/8 to f/16. The hy- perfocal scale is located above the distance scale on the lens barrel.

  • Page 17: Rear Gelatin Filter Slot

    Extended User Manual – Irix 15 mm f/2.4 REAR GELATIN FILTER SLOT Your Irix lens is equipped with a 30 mm x 30 mm slot behind the rear element to accommodate ge- latin filters. A template for pre-cutting filters is inc- luded on the last page of this document.

  • Page 18: How To Attach The Lens To The Camera

    Extended User Manual – Irix 15 mm f/2.4 HOW TO ATTACH THE LENS TO THE CAMERA Exact mounting methods vary from camera to camera. Consult the user’s manual for your came- ra for instructions on mounting your Irix lens. The dot on the case bevel closest to the camera indica- tes the alignment mark for mounting.

  • Page 19: Rear Lens Cap

    It should be attached immediately when the lens is removed. Your Irix lens comes with a spare rear cap, which you can find inside the lens box. Additional lens caps can be purchased from www.irixlens.com if needed.

  • Page 20: Aperture Control

    Extended User Manual – Irix 15 mm f/2.4 APERTURE CONTROL Your Irix lens is equipped to function with your camera’s electronic aperture controls. It also com- municates the aperture information to the came- ra’s software for display and EXIF data.

  • Page 21: Hard Lens Case

    Extended User Manual – Irix 15 mm f/2.4 HARD LENS CASE To protect your lens against damage from the environment, always store it in the included hard case. While the case helps protect your lens, it is NOT waterproof and...

  • Page 22: Maintenance

    Extended User Manual – Irix 15 mm f/2.4 MAINTENANCE All Irix lens elements are coated with anti-reflective compounds, which also increase their resistance to contamination. Periodic cleaning should consist of dust removal with a bulb-type air blower or soft brush*, follo-...

  • Page 23: Safety Precutions

    Extended User Manual – Irix 15 mm f/2.4 SAFETY PRECUTIONS Your Irix lens is equipped with seals to prevent the infiltration of dust, moisture and water splashes. This sealing does not make your lens completely waterproof. Do not allow your lens to be- come submerged, come into contact with liquids under pressu- re,or be stored in humid locations.

  • Page 24: Technical Specification

    Extended User Manual – Irix 15 mm f/2.4 TECHNICAL SPECIFICATION Focal Length 15 mm Maximum aperture value f/2.4 Minimum aperture value f/22 Number of aperture blades Image size 36 x 24 mm Angle of view 110° Minimal focusing distance 28 cm (0.91 ft)

  • Page 25: Template For Cutting Gelatine Filters

    Extended User Manual – Irix 15 mm f/2.4 TEMPLATE FOR CUTTING GELATINE FILTERS...
  • Page 26 VER. 1.1 www.irixlens.com info@irixlens.com...

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