Is the Lava Z91 good

Focal length (35mm)

The focal length is the distance between the main plane of an optical lens or a curved mirror and the focus (focal point). It can be used to know the magnification factor of the lens and to calculate the angle of view given the size of the sensor. A standard reference used for comparisons is the 35mm format, which is a 36 × 24 mm sensor. A standard wide-angle lens would be around 28 to 35 millimeters based on the 35mm format.

The smaller the number, the wider the lens.

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Focal length

The focal length is the distance between the main plane of an optical lens or a curved mirror and the focus (focal point). It can be used to know the magnification factor of the lens and to calculate the angle of view given the size of the sensor. The native focal length of the sensor cannot be used for comparisons between different cameras if they are not the same size. Therefore, the 35mm format is a better reference.

With the same sensor, the following applies: the smaller the number, the wider the lens.

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The aperture of a lens, expressed as the f-number (light intensity), is the ratio of the lens focal length to the diameter of the front lens element. The smaller the f-number, the more light the sensor can capture, if all other factors are equal. More information on Wikipedia.

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stabilization

Indicates the type of image stabilization that this lens has:

  • OIS: Optical image stabilization is the best stabilization because either the sensor or lens is actively moved to compensate for camera shake, and it is most effective at correcting it.
  • ICE: Electronic image stabilization is a good alternative for video that does not require any moving parts in the camera module. It uses a cut off part of the sensor to provide the actual image and the rest is used as a buffer to try to keep the image as stable as possible. A larger buffer area can compensate for larger movements, but it also reduces the size of the output. This stabilization does not help when taking photos.
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Horizontal field of view

The horizontal field of view in degrees that this lens can capture when the maximum resolution of the sensor is used (i.e. adapting to the sensor aspect ratio and no sensor cropping).

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Vertical field of view

The vertical field of view, in degrees, that this lens can capture when the maximum resolution of the sensor is used (i.e. adapting to the sensor aspect ratio and no sensor cropping).

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Zoom factor

Shows the magnification factor of this lens compared to the primary lens of the device (calculated by the focal length of the current lens divided by the focal length of the primary lens). The primary camera is shown to have a magnification factor of 1, ultra-widescreen cameras have magnification factors less than 1, and telephoto cameras have magnification factors greater than 1.

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Physical sensor size

Physical size of the sensor behind the lens in millimeters. If all other factors are equal (especially the resolution), the larger the sensor, the more light it can capturebecause every physical pixel is larger.

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Pixel size

The size (page) of a single physical pixel on the sensor in microns. When all other factors are equal, the larger the pixel size, the better the image quality. In this case, each photoreceptor can capture more light and potentially better distinguish the signal from the noise, resulting in better image quality, especially in low light.

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Sensor area

Displays the physical sensor area in square millimeters.

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Maximum image resolution

The maximum image resolution that this sensor can output in JPEG format. Sometimes, when the sensor can also deliver images in RAW format (DNG), these can be a little larger, as an additional area is used for calibration purposes, among other things. Unfortunately, firmware restrictions for third-party applications also mean that the maximum image resolution offered to third-party applications can be significantly lower than the actual resolution of the sensor, so the resolution shown here is the maximum resolution available to third-party applications can access from this sensor.

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Megapixels

The number of megapixels calculated from the maximum image resolution.

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Image format

The available output image formats this camera can deliver:

  • JPEG only: The camera can only produce images in JPEG format. There is no DNG / RAW support for this particular camera (other camera modules on the device may support DNG / RAW).
  • JPEG / DNG: The camera can produce images in JPEG and DNG / RAW format (either JPEG or DNG, or both at the same time).
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Focus mode

The focusing possibilities of this camera:

  • Auto / Man.: This camera supports all common focus modes, in particular automatically and manually (manual adjustment of the focus distance).
  • Automatic: only the auto focus modes are supported (auto, macro, continuous focus, etc.). Especially manual focus is not supported.
  • Firmly: This camera module does not support focusing in any way (the focus is set to a fixed position, usually at infinity, and it cannot be changed in software or hardware as the lens is designed that way).
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Focus on infinity

It indicates whether this lens can be set to focus at infinity or not. Even if the camera supports auto focus and manual focus, there may be cases where the focus range to which the lens can be set does not include the infinity position. This property is important for astrophotography, since the automatic focus does not work reliably in such low-light scenarios.

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Minimum focus distance

The smallest distance this lens is able to focus on objects. This is especially useful for macro photography.

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The distance from which objects always appear in focus. Therefore, when the camera is set to infinity, any object beyond that distance will appear in focus.

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Manual exposure time range

The range of supported manual exposure in seconds (minimum or shortest to maximum or longest). This camera may support exposures outside of this range, but only in auto mode and not manual exposure mode. Also note that this area is the area to which third-party applications have access, as often the camera application pre-installed on the phone by the manufacturer has privileged access to the hardware and offers longer or shorter exposure times.

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ISO range

The range of manual sensitivity (ISO) supported. This camera may support ISO sensitivities outside of this range in auto mode. Also note that this area is the one that third-party applications have access to, as often the camera application pre-installed on the phone by the manufacturer has privileged access to the hardware and offers an expanded manual range of sensitivity.

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Maximum analog sensitivity

The maximum ISO sensitivity possible in manual mode is usually achieved by digitally amplifying the signal from the maximum supported analog sensitivity. This information, if available, lets you know what the sensor's maximum analog sensitivity is.

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Disclaimer of Liability

The information in this database is provided “as is”, and FGAE assumes no responsibility for errors or omissions. The user assumes the entire risk associated with the use of this data. FGAE assumes no liability for the use or misuse of the data described and / or contained here. The user bears all responsibility in determining whether this data is suitable for the purpose intended by the user.

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