- than for an
achromatic lens of
equivalent aperture and
focal length.
Apochromats are also
corrected for
spherical aberration at two wavelengths, rather...
- in
characterizing a system's
chromaticity (such as in the
design of
apochromats), the full
dispersion relation (refractive
index as a
function of wavelength)...
- semi-
apochromat objectives deal with
color better than
achromatic objectives. To
reduce aberration even further, more
complex designs such as
apochromat and...
- Trilobites,
which are now extinct, had
natural doublet lenses in
their eyes.
Apochromats can also be made as doublets.
Doublets can be air-spaced, cemented, or...
- correction,
combined with
improved spherical aberration correction.
Apochromats are much more
expensive than achromats.
Different lens
materials may...
-
correction can be
further increased, as seen in an
apochromatic lens or
apochromat,
which provides perfect correction at
three wavelengths. In general, correcting...
- to make and sell
achromatic doublets. Dollond's son
Peter invented the
apochromat, an
improvement on the achromat, in 1763.
Several different types of achromat...
- achromatic, achromatism, achromatopsia, achromatopsic, amphichroic,
apochromat, auxochrome, chroma, chromatic, chromatid, chromatop****, chrome, chromium...
-
lenses may also have the focus, iris, and
other functions motorized.
Apochromat (apo)
lenses have
added correction for
chromatic aberration.
Process lenses...
- 1-meter f/8 Ritchey–Chrétien
reflector from DFM
Engineering APM 203mm f/9
apochromat refractor from APM TOA-130 130mm
refractor from
Takahashi FSQ 106 106mm...
