WILLIAM OPTICS RedCat 51 WIFD Telescope Instruction Manual

WIFD

REDCAT 51

MANUAL

WILLIAMOPTICS.COM/REDCAT-51-III

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.

SPECIFICATION

• Focal Length : 250mm (Astrograph)

• Diameter : 51mm

• Aperture : f/4.9

• Focuser : WIFD (WO INTERNAL FOCUS DESIGN)
  (Compatible with EAF)

• Image Circle : 45mm full frame

• Tube Length : 298mm

• Dew Shield Circumference : 265mm

• Dew Shield Diameter : ϕ84mm

• Weight : 3.90lbs / 1.770kg (OTA only)
  5.25lbs / 2.380kg (OTA with ring, dovetail and saddle)

SURFACE: IMA

Spot Diagram

Lens has no title.
2023-11-16 Unit are μm.

Airy Disk Radius : 3.331 μm

|
Field :|

1

| 2| 3| 4| 5|

6

|
RMS Radius :|

2.992

| 2.855| 2.650| 3.222| 3.146|

4.051

GEO Radius :|

6.292

| 8.889| 9.169| 11.154| 7.459|

6.770

| Super Flat SED250 X 51.zmx
Configuration 1 of 1
Scale Bar :| 100|

Reference : Centroid

Pupil Radius: 25.0000 Millimeters

Millimeters

Longitudinal Aberration
Lens has no title.
2023-11-16
Wavelengths: From 0.436 To 0.680 μm|
Super Flat SED250 X 51.zmx
Configuration 1 of 1

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.

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 Dovtail Plate
H. Soft Carry Case

PARTS

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 Ring / Knob
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. M4 Screw Holes for Finder Bracket
O. Focuser Adjusting Knob with Thermometer
P. M48 Adapter (for Camera Mount)

TELESCOPE DIAGRAM

Lens

1. M82
2. M3 Screw
3. Bahtinov Mask
4. M80
5. Protection Cover
6. Main Tube
7. Mounting Ring & 210mm Dovetail

1. Camera Angle Rotation Locking Screw
2. Focuser Tension Screw
3. Do not over tighten (Release the lock tension when focusing)
4. 10:1 Ratio Fine Knob
5. Adapter for Camera Mount
6. M48 Filter
7. M48
8. M54

1. Tension Screws (for increase focuser tension)
2. Finder Bracket Holder Screws (remove both screws before use)
3. Do Not Touch
4. Use 2.5mm Allen Key
5. Use 5mm Allen Key

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 12)
Tension Screw (Please refer to Note 2)
Do Not Touch

IMPORTANT NOTE:

1. The focuser smoothness adjustment ONLY when necessary by progressively push & pull screws until you reach the desired smoothness.
2. When using the telescope with the motor, please ensure that the tension screw is not over-tightened. Over-tightening the tension screw may cause damage to the focuser.
   Think of it like driving a car and pressing the gas pedal while also pressing the brake simultaneously. Just as this action could harm your car’s systems, over-tightening the tension screw could compromise the functionality of your telescope’s focuser.

OPERATION GUIDE

Where Is the Tilt Adapter?

Step 1.
Remove the rotator knob.

1. Remove

Step 2.
Twist the cover.

1. Cover
2. Removed

Step 3.
The tilt adapter is inside.

1. Cover
2. Tilt adapter

Step 4.
Remove the cover when you need to adjust it.

Step 5.
How to adjust the tilt adapter.

How to Install EAF

Step 1.
Remove the top screw with 2mm Allen key.

Step 2.
Release two inner knob screws.

Step 3.
Remove the knob.

Step 4.
Align the screw holes.

1. for bracket screw

Step 5.
Lock two set screws on shaft.

1. two set screws on shaft

Step 6.
Tighten both bracket screws.

ACCESSORIES MAP

Cinematagraphy

Camera mount

Erecting Prism for WIFD Cat 51
(coming soon)

Astrophotography

Red Dot Sight

STC
Astro-Multispectra Filter
Astro Duo-Narrowband Filter

M-G32PB-RD (optional)

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