In optics, the f-number (sometimes called focal ratio, f-ratio, or relative aperture[1]) of an optical system expresses the diameter of the entrance pupil in terms of the focal length of the lens; in simpler terms, the f-number is the focal length divided by the “effective” aperture diameter. It is a dimensionless number that is a quantitative measure of lens speed, an important concept in photography. Click the first source link for more information.
Click the second source link for other camera tips and helpful information.
Camera reports batteries low, but is it low charge or bad electrical contacts? Overcharging can ruin good batteries!
The secret to making digital cameras work better is having good electrical contacts between the batteries and the camera.
What? on
September 24th, 2008
2.8-5.8 is the variable aperture range. The aperture controls the light that enters through the lens which directly affects the depth of field.
5.35-21.4mm is the focal length range. In layman’s terms: the greater the focal length range the further you can zoom. Divide the second number by the first any you get your zoom ratio (4x).
These numbers aren’t very important to the average Cyber-shot W-1XX user.
MystiK Whyspers on
September 24th, 2008
If you told me which camera I could provide an answer but Sony has made perhaps 100 different models over the years so I don’t want to guess. It appears that the first part is 2.8 (not a comma but a decimal point) and is an indicator of how fast the camera is. 2.8 is an aperture setting that is pretty fast for most lenses and represents a wide opening.
Wide apertures allow for faster exposures to stop action if the shutter speed corresponds to suitable lighting conditions.
In optics, the f-number (sometimes called focal ratio, f-ratio, or relative aperture[1]) of an optical system expresses the diameter of the entrance pupil in terms of the focal length of the lens; in simpler terms, the f-number is the focal length divided by the “effective” aperture diameter. It is a dimensionless number that is a quantitative measure of lens speed, an important concept in photography. Click the first source link for more information.
Click the second source link for other camera tips and helpful information.
Camera reports batteries low, but is it low charge or bad electrical contacts? Overcharging can ruin good batteries!
The secret to making digital cameras work better is having good electrical contacts between the batteries and the camera.
2.8-5.8 is the variable aperture range. The aperture controls the light that enters through the lens which directly affects the depth of field.
5.35-21.4mm is the focal length range. In layman’s terms: the greater the focal length range the further you can zoom. Divide the second number by the first any you get your zoom ratio (4x).
These numbers aren’t very important to the average Cyber-shot W-1XX user.
If you told me which camera I could provide an answer but Sony has made perhaps 100 different models over the years so I don’t want to guess. It appears that the first part is 2.8 (not a comma but a decimal point) and is an indicator of how fast the camera is. 2.8 is an aperture setting that is pretty fast for most lenses and represents a wide opening.
Wide apertures allow for faster exposures to stop action if the shutter speed corresponds to suitable lighting conditions.