Cat 91 WIFD
Nov 20, 2024 by WO Team
Specification
Lens Type | 5 Elements Advanced Petzval Design |
Focal Length | 448 mm |
Diameter | 91 mm |
Aperture | f/4.9 |
Image circle | 55 mm |
Focuser | WIFD R&P Focuser (Compatible with EAF) |
Adapter Included | Tilt Adjuster / Rotator / M63 → M54 Adapter / M63 → M48 Adapter |
Optional Flattener | No Flattener Required |
T-rings Supported | Canon EF, RF | Nikon F, Z | Sony E | Pentax K | MFT (M4/3) | FUJI X |
Camera Format | Medium Format (needs additional adapter) / Full Frame / APS-C / M43 |
Tube Length | 556 mm |
OTA Weight | 4.72 kg / 10.41 lbs |
Total Weight | 6.3 kg / 13.89 lbs |
Diagram Reports
Spot Diagram
Longitudinal Aberration
Size Diagram
Parts
- Front Bahtinov Mask Cover
- Lens Cover with Bahtinov Mask How to focus with the Bahtinov Mask ?
- Dew Shield
- WIFD Focuser How to adjust Focuser Tension?
- Focus ruler scale Window
- Two Speed 1:10 Ratio Fine Knob
- Fine Knob Protecting Cover
- M4 Screw Holes for Finder Bracket
- Focuser Knob with Temperature Gauge ( Can be removed to attach EAF. How to install EAF? )
- Tilt Adapter How to adjust Tilt Adapter?
- Tilt Adapter Protecting Cover
- Camera Angle Rotator (CAA)
- CAA Locking Knob
- M63 → M48 Adapter with M48 Filter Thread How to install a Filter? ( M63 → M54 Adapter interchangeable )
- M48 ( M54 ) Rear Dust Cap
- Handle Bar with Mini Vixen-style Mounting Base
- M4 Screw Holes For Locking Screws
- Mounting Base Locking Screws (M4)
- M6 Screw Holes
- Mounting Ring
- M6 Screw Holes for Finder Bracket
- Mounting Ring Knob
- Vixen-style Dovetail Plate
Operation Guide
Focuser Tension Adjustment
There’s two side to build WIFD focuser tension:
BUTTON / Rack & Pinion Gear
- Quick tension adjustment knob
- Smoothness adjustment - Pull in (3mm Hex)
- Smoothness adjustment - Push out (2mm Hex)
- Can be removed to attach the electronic devices such as EAF (refer to Installing EAF)
- Please Don’t Touch
TOP / Focuser Draw Tube
- Focuser Draw Tube Tension Screws Please Don’t Touch
- Guider/Finder bracket mounting screws (2.5mm Hex)
The focuser smoothness adjustment ONLY when necessary by progressively push & pull screws until you reach the desired smoothness.
When using the telescope with the motor, be sure not to over-tighten the tension screw, as this could damage the focuser. Consider it like driving a car while pressing both the gas and brake pedals simultaneously. Just as this could harm your car's systems, over-tightening the tension screw can compromise your telescope's focuser functionality.
Camera Tilt Adjustment
Where is the tilt adjuster?
- Remove the rotator knob.
- Remove the ring cover.
- The tilt adapter is inside.
Adjusting Instruction
Installing EAF
- Turn the telescope over and remove the Tension screw.
- Remove the top cover screw near the temperature gauge with 2mm Allen key.
- Release (don’t remove) two inner knob screws.
- Remove the temperature gauge knob.
- Find the flat side on the shaft and turn it to face the hole.
- Put the 5-6mm Flexible coupling on the shaft and lock the two inner screws.
- Put the EAF body on and lock the two inner screws.
On Step 6 & 7:
Please make sure one of the screws is lock on the flat side
- Align the screw holes.
- Lock the four M4 bracket screws.
Installing Filter
Only applies to the M48 camera adapter ( There are no filter threads on the M54 adapter, filter wheel is used instead )
- Lock the Rotator
- Take off the M48 adapter
- Lock the filter ( male thread ) inside the M48 adapter ( female thread )
- It is recommended to apply some lubricating oil on the threads first to avoid being permanently tightened.
- Put the adapter back
