WILLIAM OPTICS L-RC71RDIII RedCat 71 II f-4.9 Petzval Refractor Telescope Instruction Manual

: June 21, 2024
: WILLIAM OPTICS

Table of Contents

L-RC71RDIII RedCat 71 II f-4.9 Petzval Refractor Telescope
SPECIFICATION
PACKAGE CONTENTS
PARTS
TELESCOPE DIAGRAM
OPERATION GUIDE
ACCESSORIES MAP
Read User Manual Online (PDF format)
Download This Manual (PDF format)

WIFD
REDCAT 71
MANUAL $WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope$ WILLIAMOPTICS.COM/REDCAT-71

L-RC71RDIII RedCat 71 II f-4.9 Petzval Refractor Telescope

Warning
Never aim your telescope or finder scope at the Sun without proper Solar filters installed on the front of the telescope. Doing so for even a moment may permanently damage your vision. Proper Solar filters consist of filters made by reputable manufacturers, designed to fit tightly over the front of the dew shield. Solar eyepiece filters are not considered safe, and should not be used. With proper front mounted Solar filters, the telescope will not be harmed by viewing the Sun.

$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Symbol$

SPECIFICATION

$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Parts$

Focal Length: 350mm (Astrograph)
Diameter: 71mm
Aperture: f/4.9
Focuser: WIFD (WO INTERNAL FOCUS DESIGN) (Compatible with EAF)
Image Circle: 45mm full frame
Tube Length: 427mm
Dew Shield Circumference: 331 mm
Dew Shield Diameter: Φ105mm
Weight: 7.1 / Ibs / 3.225kg (OTA only) 9.47lbs / 4.295kg (OTA with ring, dovetail, and saddle)

$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - graph$

NOTE:
We are utilizing a unique Petzval design featuring four optical elements in the William Optics (WO) Cat series telescopes. This design incorporates the use of high-quality FPL-53 glass for superior optical performance. Before storing your telescope, it is crucial to allow it sufficient time to acclimatize to room temperature. Please ensure that the telescope is thoroughly dry, free of dew or moisture, before storing. This ensures the safety and longevity of the telescope’s components.
Always store the telescope in a consistent temperature and dry environment to prevent any potential damage to the optical elements. Remember to leave the tube uncovered and opened during the acclimatization period. As always, taking appropriate care of your telescope will ensure its optimal performance and extend its lifespan.

Back Focus

$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Back Focus$

PACKAGE CONTENTS

$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Package Contents$

A. Dust Cover with Bahtinov Mask
B. Dew Shield
C. Main Tube
D. Saddle Handle Bar
E. Camera Angle Rotation Device
F. Tilt Adapter (inside)
G. 210mm Vixen Style Dovetail Plate
H. Soft Carry Case

PARTS

$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Parts 2$

A. Rear Dust Cap (M48)
B. Saddle Handle Bar
C. WIFD Focuser
D. Dew Shield
E. Lens Cover with Bahtinov Mask
F. Front Bahtinov Mask Cover
G. Mounting Rings / Knobs
H. Camera Angle Rotator| I. 210mm Dovetail
J. 2 Speed 10:1 Ratio Fine Knob
K. M4 Screw Holes for Finder Bracket
L. Locking Screws on Saddle Handle Bar (M4)
M. Camera Angle Rotation Locking Screw
N. M6 Screw Holes for Finder Bracket
O. Focuser Adjusting Knob with Thermometer
P. M48 Adapter (for Camera Mount)
---|---

TELESCOPE DIAGRAM

$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Diagram$ $WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Diagram 2$ $WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Diagram 3$

R & P GEAR SPACING SCREWS

Adjustment Screws (3 mm Allen Key) – Pull Screw
Adjustment Screws (2 mm Allen Key) – Push Screw
Can be Removed to Attach the Electronic Motorized Device such as EAF (Please refer to the instructions on page 13)
Tension Screw
Do Not Touch

$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Diagram 4$

The focuser smoothness adjustment ONLY when necessary by progressively push & pull screws until you reach the desired smoothness.

NOTE:
DO NOT ADJUST IT BEFORE ASKING WO

OPERATION GUIDE

Where Is the Tilt Adapter?

$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Remove knob$ | Step 1.
Remove the rotator Knob.
---|---
$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Twist the cover$ | Step 2.
Twist the cover.
$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - adapter$ | Step 3.
The tilt adapter Is inside.
$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Remove the Cover$ | Step 4.
Remove the cover when you need to adjust it.
$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - adapter 2$ | Step 5.
How to adjust the tilt adapter.

How to Install EAF

| Step 1.
Remove the top screw with 2mm Allen key.
---|---
$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - Screws$ | Step 2.
Release two inner Knob screws
| Step 3.
Remove the knob.
| Step 4.
Align the screw holes.
$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - shaft$ | Step 5.
Lock two set screws on shaft.
$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - both brackert$ | Step 6.
Tighten both bracket Screws.

$WILLIAM OPTICS L RC71RDIII RedCat 71 II f 4.9 Petzval Refractor Telescope - even and parallel$

NOTE:
Ensure proper alignment by loosening the mounting rings and adjusting the telescope on the mount to guarantee that both knobs on either side of the focuser are even and parallel to the mount to prevent any interference with the knobs impacting the mount’s saddle plate.