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8 yellow 83% t [series 4 – Canon 93517 User Manual

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#8 Yellow 83% T [Series 4]

All observing information for this filter is the same as that given for the #12 and #15 Deep Yellow
filters, with the exception of the following:

Mars – Improves the Martian maria by reducing scattered light from blue areas, while allowing
passage of more green light for studying yellow dust clouds. Comets – Brings out highlights in
yellowish dust tails and enhances appearance of comet heads.

ORANGE

#21 Orange 46% T [#94118-05 & Series 1]

Moon – Greatly enhances lunar features. Jupiter – Improves appearance and detail revealed in
structure of Jovian belts. Enhances viewing of festoons and polar regions. Mars – Reduces light
from the blue and green areas which darken the maria, oases and canal markings, while lightening
the orange-hued desert regions. Also sharpens the boundaries of yellow dust clouds. Mercury
Reduces the brightness of blue sky during daylight observing, to reveal surface features. Saturn
Improves structure of the Saturnian bands and highlights blue polar regions. Venus – Use during
daylight observing to reduce brightness of blue sky. Comets – Enhances definition of comet dust
tails and heads in larger telescopes (11" and greater aperture). Solar – When using a Celestron Mylar
Solar Filter, adding this orange filter will give true color rendition.

RED

#25 Red 14% T [#94118-07 & Series 2]

Moon – Improves lunar features. Jupiter – Useful for studying bluer
clouds. Mars – Ideal for observation of the polar ice caps and features
on the Martian surface. Sharpens the boundaries of yellow dust
clouds. Mercury – Improves observation at twilight, when the planet
is near the horizon. During daylight, it reduces the brightness of the
blue sky to enhance surface features. Saturn – Useful for studying
bluer clouds. Venus – Use during daylight observing to reduce
brightness of blue sky. Occasionally deformations of the terminator are visible.

#23A Light Red 25% T [Series 3]

All observing information for this filter is the same as that given for the #25 filter, with the exception
of the following:

Mars – Reduces light from blue and green areas which darkens the maria, oases and canal markings,
while lightening the orange-hued desert regions. Sharpens the boundaries of yellow dust clouds.
Comets – Improves definition of comet dust tails.

BLUE
#80A Light Blue 30% T [#94118-12 & Series 1]
#82A Pale Blue 73% T [Series 4]
#38A Blue 17% T [Series 3]

Moon – Enhance lunar detail. Jupiter – Enhance the boundaries between the reddish belts and
adjacent bright zones. Useful for viewing the Great Red Spot. Mars – Very useful during the violet
clearing. Helpful in studying surface features and polar caps. Mercury – Improve observation of dusky
surface markings at twilight, when the planet is near the horizon. Saturn – Enhance low-contrast
features between the belts and zones. Venus – Useful for increased contrast of dark shadings in upper
Venusian clouds. Comets – Bring out the best definition in comet gas tails.

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