Sony SEL90M28G User Manual

The camera does not focus using the auto
focus (AF) setting.
Autofocus does not focus well sometimes due to reasons such as distance from the subject and
the environment in which you are photographing.
Check the solutions as follows according to the conditions or environment.
 Make sure you are not too close to the subject.
The minimum distance from the subject in which you can photograph (minimum
focusing distance) is determined by the individual lens.
Photographs will not be in focus if you attempt to shoot at less than the minimum
focusing distance. Please shoot at the focus distance or farther away from the subject.
Minimum focusing distance is noted on the front or side of the lens.
Example: For SAL1855 （DT 18-55mm F3.5-5.6 SAM), minimum focusing distance is
noted as "1.25m/0.82ft" in meters (m) and feet (ft).

 Make sure the subject or environment do not inhibit focusing.
o Subjects with no contrast, such as blue sky or white walls
o Situations where multiple subjects are at different distances within the focus area
o Subjects with repeating patterns, such as building exteriors
o Bright or backlit subjects
o Shiny subjects, such as water surfaces, and glossy subjects
o Fast moving subjects
Focus as follows for such subjects or in situations where it is difficult to focus.
7. Compose the shot with the focus locked using a subject at the same distance
(Lightly press the shutter button to keep a green frame displayed.)

Sony SEL90M28G Specifications

General

Lens type	Telephoto lens
Component for	SLR
Image stabilizer	Yes
Fixed focal length	90 mm
Lens mount interface	Sony E
Maximum aperture number	22
Minimum aperture number	2.8
Closest focusing distance	0.28 m
Number of diaphragm blades	9
Lens structure (elements/groups)	15/11
Maximum magnification	1 x
Camera brands compatibility	Sony
Product color	Black

Weight and Dimensions

Length	130.5 mm
Weight	602 g
Diameter	79 mm
Filter size	62 mm

Summary

Troubleshooting Autofocus Issues

Maintain Minimum Focusing Distance

Ensure shooting distance is within the lens's minimum focusing distance.

Address Environmental Focusing Inhibitors

Ensure subjects have contrast and are not too far or close, or moving fast.

Utilize Focus Lock for Difficult Shots

Lock focus on a subject at the same distance to ensure focus stability.

Switch to Manual Focus (MF)

Manually adjust focus when autofocus is not performing optimally.

Adjust Aperture for Depth of Field

Narrowing aperture (increasing F-value) can help achieve overall focus.

Understanding Camera Mount Types

A-mount Camera Specifications

A-mounts are for cameras with mirrors or translucent mirrors.

E-mount Camera Specifications

E-mounts are for mirrorless camera models.

A-mount vs. E-mount Features

A-mounts offer phase-detection AF; E-mounts allow compact designs.

A-mount and E-mount Sensor Sizes

Both mount types offer full-frame and APS-C sensor options.

Identifying A-mount and E-mount Lenses

A-mount lenses start with 'SAL', E-mount lenses with 'SEL'.

Adapting A-mount Lenses to E-mount

A-mount lenses can be used on E-mount bodies with a mount adaptor.

Troubleshooting Lens Recognition Errors

Verify Lens Compatibility

Ensure the lens is compatible with your camera model.

Ensure Proper Lens Connection

Attach the lens clockwise until it clicks for secure connection.

Clean Lens and Camera Contacts

Remove dirt or debris from electronic contacts on lens and body.

Check Camera Body Pins

Inspect camera body contacts for damage or obstructions.

Test with an Alternative Lens

Use another lens to diagnose if the issue is with the lens or camera.

Resetting Camera to Factory Settings

Locate Model Number for Support

Find the model number to access specific operating instructions.

Perform Reset via Camera Menu

Navigate menu options 'Setup', 'Setting Reset', 'Initialize' to reset settings.

Utilize Physical RESET Button

Use a pointed object to press and hold the reset button for factory reset.

Understand Reset Notes and Limitations

Note that some apps may uninstall, and specific error codes may prevent reset.