-35-
designed lenses of the Barlow type that inc~ease effective
eyepiece power. The Model 122 2X Telenegative Amplifier
(l~" O.D.) slides directly into the telescope eyepiece
holder, followed by the diagonal prism and eyepiece. A
particular advantage of Barlow lenses is that the eye
relief of longer focal length eyepieces is maintained while,
in conjunction with the Barlow, higher powers are utilized.
Meade Telenegative Amplifiers are also available in 3X
and in variable 2X-3X formats.
II
L..
2" DIAGONAL MIRROR
The 2" Diagonal threads directly onto the rear-cell thread
of the Model 2080 or 2120. With this accessory, eyepieces
of the oversize 2" O.D. barrel may be employed for spectacular
wide-field views of the heavens. Included with the 2"
Diagonal is an adapter bushing for l~" O.D. eyepieces so
that the 2" Diagonal need not be removed each time l~"
O.D. eyepieces are employed.
Note: The 2" Diagonal includes a front-surface-aluminized
precision flat mirror, not a prism. Avoid rubbing or wip-
ing this mirror, or scratches will almost certainly result.
If a light layer of dust collects on the mirror surface,
use an ear syringe (available at local pharmacies) to blow
off the dust.
THREAD-IN COLOR FILTERS
During observations of the Moon and planets Meade ph~to-
visual thread-in color filters enhance the level of visible
detail, increase image contrast, and reduce irradiation in
the observer's eye. The l~" filters thread into the "barrels
of all Meade l~" O.D. eyepieces, and into most other eye-
piece brands as well. The filters may be piggybacked to
yield many subtle color differences useful in planetary
observations~
NOTE: THESE THREAD-IN COLOR FILTERS SHOULD NOT BE USED
IN OBSERVING THE SUN! INSTANT AND IRREVERSIBLE EYE DAMAGE
MAY OTHERWISE RESULT. FOR SOLAR OBSERVATIONS USE ONLY.
THE SPECIAL SUN FILTERS DESCRIBED ELSEWHERE IN THIS MANUAL.
(SEE "SOLAR FILTERS.") .
Hints for v~sual filter observations on the planets and
Moon:
The Moon: Use a polarizer filter to reduce undesirable
glare~ when the Moon is full or near-full, 2 polarizers
piggybacked provide a variable-density polarizing system:
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