ENGLISH
DIELECTRIC STAR
DIAGONAL, 1.25”
WITH TWIST-LOCK
Item# 93571
The Celestron Dielectric Star Diagonal, 1.25”
with Twist-Lock makes interchanging any 1.25”
accessory easier than ever. At the heart of
this diagonal is a dielectric coated, diffraction
limited, 99+% reflective mirror. By upgrading
to this premium star diagonal, you have truly
unlocked the peak resolution of your telescope.
Using it couldn’t be simpler: just turn the twist-
lock clockwise to secure your eyepiece in place,
or turn it counterclockwise to loosen the clamp,
freeing the eyepiece. The bright, Celestron
orange lock collar is easy to see at night,
allowing you to quickly swap out attachments
without the need for additional light, preserving
your night vision. The full metal frame offers a
durable, rigid construction that will last for years
to come. The 1.25” insert is baffled and painted
matte black, while the mirror housing is insulated
with foam padding to minimize glare and block
internal reflections and stray light. The 1.25”
insert is threaded to accept 1.25” filters. Dust
caps are included to protect your diagonal.
USING THE TWIST-LOCK MECHANISM
To attach a 1.25” accessory to the diagonal,
twist the twist-lock collar counterclockwise
until it becomes loose and remove the dust
cover. Insert your 1.25” eyepiece, Barlow
lens, or camera adapter into the twist-lock
and twist the collar clockwise to secure the
accessory in place. Virtually any accessory that
uses a standard 1.25” barrel will work with
this diagonal. An integrated 1.25” barrel stop
prevents overextended 1.25” accessories from
damaging the mirror.
Specifications
Diagonal Size
1.25”
Visual Back Compatibility
1.25”
Twist-Lock
Anodized orange aluminum,
knurled grip
Compression Ring
Yes, single compression ring
Diagonal Type
Mirror
Glass
BK7
Coatings
Dielectric
Number of Coatings Layered
58
Optical Quality
Diffraction limited
Diagonal Construction
Aluminum
Threads for Filters
Yes 1.25”
Weight
7.5 oz (213 g)
Warranty
2 years
© 2019 Celestron • All rights reserved
celestron.com/pages/technical-support
Telephone: 1(800) 421-9649
2835 Columbia Street • Torrance, CA 90503 USA
04-19
Products or instructions may change without notice
or obligation.
Designed and intended for those 14 years of age
and older.
ENGLISH
DIELECTRIC STAR
DIAGONAL,
2” WITH TWIST-LOCK
Item# 93573
The Celestron Dielectric Star Diagonal, 2” with
Twist-Lock makes interchanging any 2” or 1.25”
accessory easier than ever. At the heart of this
diagonal is a dielectric coated, diffraction limited,
99+% reflective mirror. By upgrading to this
premium star diagonal, you have truly unlocked
the peak resolution of your telescope. Using
it couldn’t be simpler: just turn the twist-lock
clockwise to secure your eyepiece in place, or turn
it counterclockwise to loosen the clamp, freeing the
eyepiece. The bright, Celestron orange lock collar
is easy to see at night, allowing you to quickly swap
out attachments without the need for additional
light, preserving your night vision. The full metal
frame offers a durable, rigid construction that will
last for years to come. The SCT and 2” adapters
are baffled and painted matte black, while the mirror
housing is insulated with foam padding to minimize
glare and block internal reflections and stray light.
The 2” insert is threaded to accept filters. Dust
caps are included to protect your diagonal.
USING THE DIAGONAL WITH 2” ACCESSORIES
To attach a 2” accessory to the diagonal, twist
the 2” twist-lock collar counterclockwise until
it becomes loose and remove the preinstalled
stepdown adapter for 1.25” accessories. Insert
your 2” eyepiece, Barlow lens, or camera adapter
into the 2” twist-lock and twist the collar clockwise
to secure the accessory in place. Virtually any
accessory that uses a standard 2” barrel will
work with this diagonal. An integrated 2” barrel
stop prevents overextended 2” accessories from
damaging the mirror.
USING THE DIAGONAL WITH 1.25” ACCESSORIES
WITH THE STEPDOWN ADAPTER
To attach a 1.25” accessory to the diagonal, twist
the 2” twist-lock collar counterclockwise until it
becomes loose. If you are using the diagonal for
the first time, you will find the stepdown adapter for
1.25” accessories preinstalled. Otherwise, insert
the stepdown adapter and tighten the 2” collar
to secure it in place. Insert your 1.25” eyepiece,
Barlow lens, or camera adapter into the stepdown
adapter and twist the 1.25” collar on the stepdown
adapter clockwise to secure the accessory. Virtually
any accessory that uses a standard 1.25” barrel will
work with this diagonal and the stepdown adapter.
INTERCHANGING THE SCT AND 2” ADAPTER
Large telescopes designed to work with 2”
accessories typically have one of two ways to attach
accessories to the visual back of the telescope. All
Celestron Schmidt-Cassegrain telescopes (SCTs)
use a SCT thread on the rear cell of the optical tube.
Almost all SCTs feature this standard visual back
thread, going back to some of the first generation
Celestron Schmidt-Cassegrain optical tubes. This
same SCT adapter is also found on the Celestron
Mak 700 optical tube. Some other telescopes use
a 2” insert to attach 2” accessories, as opposed
to a threaded connection. This diagonal will work
with either attachment method, so you can use it
with virtually any telescope.
The SCT adapter comes preinstalled, so your
diagonal is ready to attach to any Celestron SCT
right out of the box.
To use the 2” adapter instead, firmly grasp the
SCT adapter and twist it counterclockwise to
loosen it. Remove the SCT adapter to expose the
threads on the diagonal to attach the 2” adapter.
Take the 2” adapter and begin threading it onto
the diagonal. Hand tighten to secure it.
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