WILLIAM OPTICS RedCat 61 Petzval Refractor Telescope Instruction Manual
- June 15, 2024
- WILLIAM OPTICS
Table of Contents
WILLIAM OPTICS RedCat 61 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 with 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: 300mm (Astrograph)
- Diameter: 61 mm
- Aperture: f / 4. 9
- Focuser: WIFD (WO INTERNAL FOCUS DESIGN) (Compatible with EAF)
- Image Circle: 45mm full frame
- Tube Length: 365mm
- Dew Shield Circumference: 2 91 mm
- Dew Shield Diameter: cp92mm
- Weight: 5.431bs / 2.465kg (OTA only) 7.471bs / 3.390kg (OTA with ring, dovetail and saddle)
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
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
- 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
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 (Please refer to Note 2)
- Do Not Touch
IMPORTANT NOTE
- The focuser smoothness adjustment ONLY when necessary by progressively pushing & pull screws until you reach the desired smoothness.
- 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.
Step 2
- Twist the cover.
Step 3
- The tilt adapter is inside.
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 a 2mm Allen key.
Step 2
- Release two inner knob screws.
Step 3
- Remove the knob.
Step 4
- Align the screw holes.
Step 5
- Lock two set screws on the shaft.
Step 6
- Tighten both bracket screws.
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.
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WILLIAM OPTICS RedCat 61 Petzval Refractor
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