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Definitions for
"Kellner"
Keywords:
eyepiece
,
achromat
,
barlow
,
inexpensive
,
singlet
Related Terms:
Barlow lens
,
Telephoto
,
Teleconverter
,
Telephoto lens
,
Mirror lens
,
Eyepiece
,
Close-up lens
,
Fixed focal length
,
Zoom lens
,
Refracting telescope
,
Micro lens
,
Macro lens
,
Long lens
,
Varifocal lens
,
Focuser
,
Parfocal
,
Back focus
,
Prime focus
,
Objective lens
,
Tlr
,
Extension tubes
,
Pinhole lens
,
Prime lens
,
Extension tube
,
Rangefinder camera
,
Magnifying glass
,
Slr
,
Slr camera
,
Focalize
,
Fixed lens
,
Wide-angle lens
,
Focal ratio
,
Objective
,
Diaphragm
,
Schmidt camera
,
Focal length
,
Diopter adjustment
,
Focusing
,
Abbe condenser
,
Manual iris
,
Normal lens
,
Wide angle lens
,
Fixed focus
,
Manual focus
,
Relative aperture
,
Magnification
,
Photomicrography
,
Focal reducer
,
Zoom
,
Back focal length
A good, inexpensive eyepiece design that uses one simple (single element) lens, and one two-element achromatic lens.
findascope.com
Inexpensive three-element eyepiece.
amazon.com
a good general-purpose eyepiece and a Barlow lens placed between a focuser and eyepiece can triple magnification
tamwright.com
An economy eyepiece employing a cemented doublet lens and singlet lens.
starsandscopes.net
A 3-element eyepiece design that can perform reasonably well at low-power (wide-view) focal lengths. Although this is a very old eyepiece design it is often sold at reasonable prices, under the “modernized†name Super Modified Achromat (SMA).
iceinspace.com.au
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