Here is some short-cut information about my self learned photography...
- 50 mm is NOT the lenses focal length. It is the distance between the lens and the sensor. The actual focal length is something different and usually not fixed for a camera lens
- F/1.8 means that the aperture of the lens is focal_length/1.8
- F/1.4 is a very high value of aperture, such a lens would be very fast since the lens would have to be open for a very small time.
- This is a picture of relative sizes by F number.....
- This lens uses the DX format, DX format refers to the size of the sensor, it is equivalent to the size of retina, or the size of the photographic film. It is 2/3rd the size of 135 mm. Small film size means a small view angle.
- F/1.4 is a very high value of aperture, such a lens would be very fast since the lens would have to be open for a very small time.
- The 135 film format is the same as 35mm
- The Nikon FX on the other hand is the same size as a 135mm film.....
