focal length

Watch for Symmetry Symmetry is everywhere. It's just a matter of finding it and shooting from the right angles with the right focal lengths.

The separation between the two lenses is equal to the difference between the focal lengths of the lenses.

Further focal lengths will be added to the line within the next few months.

This also applies to perspective. Consider all the focal lengths you possess and the way they might offer a different feel to your image.

When forced to use wobbly tripods (never desired) or long focal lengths, the stabilizing time can increase significantly (~8 seconds).

An efficient way of using a DOE to shape the laser writing spot under the objectives with various focal lengths is presented.

The optical image stabilization system is very useful to ensure smooth framing when filming at longer focal lengths .

The measurement of negative focal lengths takes place similarly.

the focal lengths in these planes will be different.

Other focal lengths are not as affected but you should still reckon with about 1EV of vignetting here at max. aperture.

Do you experiment with different focal lengths to produce different compositions and perspectives in your shots?

Normal focal lengths (28-50 mm) usually have minimal star movement if exposures are no longer than about 15-30 seconds.

Methods of Designating and Measuring Focal Lengths and Focal Distances of Photographic Lenses

Some vignetting at wider focal lengths