espn said:When mounted (presumably on a Nikon/Canon body) the aperture will be opened to f/2.8. Based on the selection on the camera body, when the shutter is released, the aperture will be released to the selected value.
When mounted (presumably on a Nikon/Canon body) the aperture will be opened to f/2.8. Based on the selection on the camera body, when the shutter is released, the aperture will be released to the selected value.
kensh09 said:lets say a len is f2.8. Does it means this len will always operate at f2.8? Only way to change the amount of light is through the camera's aperature and exposure?
kensh09 said:lets say a len is f2.8. Does it means this len will always operate at f2.8? Only way to change the amount of light is through the camera's aperature and exposure?
kensh09 said:'ED' for some lenses?
kensh09 said:Oic.....thanks all for your kind help...
1 more qns.....What does the 'G' stands for, e.g Nikon's AF70-300G or 'ED' for some lenses?
kensh09 said:Oic.....thanks all for your kind help...
1 more qns.....What does the 'G' stands for, e.g Nikon's AF70-300G or 'ED' for some lenses?
Reflection said:manufacturers have started inserting glass to "force" the spectrum of RGB to focus as close as possible.
tan131 said:advantages of a f2.8 lens.. to many its the bokeh..
litefoot said:ED elements dun actually "force", its more like when light passing through a "denser" medium causes the dispersion. So its more like deterring as the ED is a better medium for the light. Its mostly flourite based and extremely brittle thus hard to manufacture. Therefore, its price. May it be L in Canon, APO in Sigma/Minolta, ED in Nikon, they are pretty much the same.