This would also be about the focallength of the finished lens.
2
It would be roughly four tonnes in mass and have a 12m focallength.
3
These invariable produce worse images than the fixed focallength, prime lenses I tested.
4
The rapidity of a lens depends mainly on its aperture and its focallength.
5
It was provided with a well-corrected object-glass having a focallength of 200 mm.
Ús de focal distance en anglès
1
Other telescopes of seven, of eight, of ten, and even of twenty feet focaldistance, crown his efforts.
2
This angle is given by the ratio of the maximum dimension of the image to the focaldistance of the lens.
3
The thicker the lens, or burning-glass, is in the middle, the shorter its focaldistance, and the more strongly it will magnify.
4
The best thing about the lens, aside from the faster autofocus, is that it's possible to shoot wide open, even at the minimum focaldistance.
5
Example: for 35mm cameras (used typically) the 50 mm focaldistance was found to give the same perspective as the eye.
6
Though lighting and focaldistances varied, the girls shared the same high cheekbones, narrow interorbital distance, long upper lip, broad jawline, and tapered chin.