Irix 15 mm f/2.4 Скачать руководство пользователя страница 20 | Manualshive

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Irix 15 mm f/2.4 Скачать руководство пользователя страница 20

Extended User Manual – Irix 15 mm f/2.4

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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.

This feature allows you to fully utilize the creative

aspects of lens aperture in conjunction with your

camera’s metering system and autoexposure set-

tings.

There are a few important points to know about

your lens and its aperture settings:

1.

Using an aperture setting higher than f/16 may

cause some lack of sharpness do to an optical phe-

nomenon known as diffraction. This is not a defect,

but a natural occurrence in all optics.

2.

When selecting the maximum aperture of f/2.4,

some camera models will display f/2.5. This is a so-

ftware issue with some systems. The actual aper-

ture size will be f/2.4.

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Содержание 15 mm f/2.4

Страница 1: ...Extended User Manual Irix 15 mm f 2 4...

Страница 2: ...f engineers and photo graphers Using the finest available materials state of the art technologies and cooperation our team has created an excellent tool for both professional and amateur photographers...

Страница 3: ...CUS SCALE CALIBRATION 8 FOCUS RING LOCK 9 FOCUS RING 10 DEPTH OF FIELD SCALE 11 HYPERFOCAL SCALE 15 REAR GELATIN FILTER SLOT 17 HOW TO ATTACH THE LENS TO THE CAMERA 18 REAR LENS CAP 19 APERTURE CONTRO...

Страница 4: ...hould always be attached when the lens is not in use To attach or remove the front cap hold the lens body firmly in one hand and grasp the cap with your thumb and finger by the recesses in the front o...

Страница 5: ...be fully compatible with the lens design To attach a threaded filter align the threads care fully and rotate it clockwise while facing the front of the lens The filter should turn smoothly and with ve...

Страница 6: ...lens hood from its storage rever sed position rotate it counterclockwise when facing the lens until it releases approximately 1 8 turn To attach the hood for use align the white line on the hood with...

Страница 7: ...s graduated filters and variable ND fil ters This feature allows you to adjust those filters without removing the lens hood To open the filter window push the raised portion of the blind toward the fr...

Страница 8: ...pport team for help To calibrate the focus ring 1 Remove the calibration window cover by unscrewing the T6 Torx screw and sliding the cover outward 2 Set the focusing ring at the infinity position and...

Страница 9: ...removing the lens or to retain the focus setting when storing it in a bag case or backpack Landscape photographers street photographers and journalists can utilize the focus lock to keep the lens at t...

Страница 10: ...u can focus visually while looking at your subject in the viewfinder or LCD screen or by using the distance depth of field or hyperfocal scales on the lens barrel Your Irix lens allows you to set the...

Страница 11: ...e and focus setting It allows you to determine the plane of focus within which objects in your image will be at their sharpest Using the scale correctly takes practice The following examples will demo...

Страница 12: ...an see in the image that only the neighboring keys are in sharp focus at this aperture setting The term for this effect is shallow depth of field As this demonstrates it would be virtually impos sible...

Страница 13: ...ing the DoF scale we can now use the two numerals 8 on the scale to determine the distan ces where sharpness will drop Simply look for the distances in feet or meters that align with the 8 s on the sc...

Страница 14: ...oF scale at 16 will show a corresponding change in the indicated distances The DoF scale can be used in this manner to esti mate the plane of focus in your images at aperture settings of f 8 and small...

Страница 15: ...ften 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 That point is known as...

Страница 16: ...h the center of focus indicator the center mark on the DoF scale Your focus is now set to the hyperfocal distance and there s no need to focus visually The landscape image to the left was taken using...

Страница 17: ...r filters in conjunction with front mounted threaded filters while avoiding the vignetting that can be cause by stacking multiple front filters For instance a color correction filter can be added whil...

Страница 18: ...Irix lens The dot on the case bevel closest to the camera indica tes the alignment mark for mounting Exercise caution when attaching and detaching your lens Do not force the lens Be sure to press the...

Страница 19: ...tached from the camera 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 purchase...

Страница 20: ...re in conjunction with your camera s metering system and autoexposure set tings There are a few important points to know about your lens and its aperture settings 1 Using an aperture setting higher th...

Страница 21: ...f 2 4 21 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 will not prev...

Страница 22: ...also increase their resistance to contamination Periodic cleaning should consist of dust removal with a bulb type air blower or soft brush follo wed by the use of cleaning products specifically made f...

Страница 23: ...to the front element Do not leave the lens exposed to strong sunlight or high tem peratures Do not look directly at the sun through the lens as permanent eyesight damage may occur Do not allow the len...

Страница 24: ...perture value f 2 4 Minimum aperture value f 22 Number of aperture blades 9 Image size 36 x 24 mm Angle of view 110 Minimal focusing distance 28 cm 0 91 ft Number of lenses 15 11 grup Front filter thr...

Страница 25: ...Extended User Manual Irix 15 mm f 2 4 25 TEMPLATE FOR CUTTING GELATINE FILTERS...

Страница 26: ...VER 1 1 www irixlens com info irixlens com...

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