:Some sniper scopes do have focus adjustments e . g ..
2.
The PSO-1 has neither a focus adjustment nor a parallax compensation control.
3.
Your focus adjustments may cause changes in the size of the pupil to a small extent, and the shape of the lens to a large extent.
4.
:: The focus adjustment on a rifle scope brings the aiming reticle into focus; this is an adjustment that need only be performed once for a given user :.
5.
The Sinar F2 and F3 models have a different front standard, which completely encloses the rail and also provides a geared focus adjustment, similar to the rear rail clamp on all Sinar F models.
6.
Ideally, the person will choose a focus adjustment on the instrument that allows the eyes to have relaxed accommodation that is to present the objects at a distance of about 6 meters, or optical infinity.
7.
Mann developed a laser-based infinite depth-of-focus projector, called an " aremac ", to project onto any 3D surface without focus adjustment The projector originally displayed vector graphics rather than raster graphics.
8.
When you add a close-up lens to a camera which is focusing to infinity, and you don't change the focus adjustment, the focus will move to a distance which is equal to the focal length of the close-up lens.
9.
When you add a close-up lens to a camera which is focusing at the shortest distance at which the objective lens can focus, and you don't change the focus adjustment, the focus will move to a distance which is given by following formula:
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