- A
parfocal lens is a lens that
stays in
focus when magnification/focal
length is changed.
There is
inevitably some
amount of
focus error, but too small...
-
changes as
focal length (and magnification) changes, as
compared to a
parfocal ("true") zoom lens,
which remains in
focus as the lens
zooms (focal length...
- lens (prime lens). A true zoom lens or
optical zoom lens is a type of
parfocal lens, one that
maintains focus when its
focal length changes. Most consumer...
-
lengths (18–35 mm) Zoom
which maintains focus as the
focal length changes (
parfocal lens)
Aspherical lens with fast and
large lens
aperture Servomotor control...
-
circular from f/4 to f/8. It is one of the few
Canon photo lenses that are
parfocal. The 17–40mm is the
least expensive of Canon's
current wide-angle zooms...
- the
transparent medias of eye.
Viewing arm and
illuminating arm are kept
parfocal. This type of
illumination is
useful for
depth localization.
Direct focal...
-
without electronic control of the
aperture or autofocus. In contrast,
parfocal adaptation of EF
lenses to non-EF
camera bodies is not
possible with only...
- focaccia, focal, focus, foyer, fuel, fusillade, multifocal, omnifocal,
parfocal, refocus, refuel, trifocal,
varifocal foedus foeder- confederate, confederation...
-
select the
required objective lens.
These arrangements are
designed to be
parfocal,
which means that when one
changes from one lens to
another on a microscope...
- this is also
handled well by the in-camera corrections. The lens is near
parfocal. The lens has an
internal linear autofocus motor. It
supports both manual...
