Specification
Lens Type | 5 Elements Advanced Petzval Design |
Focal Length | 518 mm |
Diameter | 108 mm |
Focal Ratio | f/4.8 |
Image circle | 60 mm |
Focuser | WIFD R&P Focuser (Compatible with EAF) |
Adapter Included | Tilt Adjuster / Rotator / M68, M54, M48 Camera Adapters |
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 / Full Frame / APS-C / M43 |
Tube Length | 512.9 mm - 617.9 mm |
OTA Weight | 7.82 kg / 17.24 lbs |
Total Weight |
Diagram Reports
Spot Diagram
Longitudinal Aberration
MTF Chart
Relative Illumination
Learn how to read Diagram Reports
Size Diagram
Parts
- Front Bahtinov Mask Cover
- Lens Cover with Bahtinov Mask How to focus with the Bahtinov Mask ?
- Dew Shield, retractable – 105 mm
- Dew Shield Locking Screw
- 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? )
- Sensor Tilt Xterminator (STX) with integrated Camera Rotator (CAA) How to adjust STX?
- STX Auto Tension Screw
- CAA Locking Knob ( Can be replaced with the H4 set screw when using an off-axis guide system )
- CAA 360° engraved scale
- M79 → M48 Adapter ( M79 → M54, M68 Adapter interchangeable )
- M48 ( M54, M68 ) Rear Dust Cap
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) or be used as a spare.
- 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.
Sensor Tilt Adjustment (STX)
- Locate the pair of diagonally opposing screws corresponding to the affected corners.
- Use 2mm hex key to release (turn clockwise) the knob near the corner where the sensor is too far.
- Push out (turn counterclockwise) the opposite knob accordingly.
- Do not touch the Auto Tension Screws. It may disrupt balance or cause loosening.
- Make small adjustments — turn each knobs only about 1/8 turn at a time.
Any 2mm rod or hex key can be used to twist the knob mechanism.
- After each adjustment, perform a test exposure to check the star shape and alignment. Fine-tune as needed until the stars are round and sharp across the entire frame.
Tips & Notice
- Typical adjustment sessions take 2–4 test exposures to reach optimal flatness. However, fine-tuning may vary depending on your camera, filter, and backfocus setup.
- Tilt does not need to be adjusted frequently. Once set, it should remain stable unless major components (e.g., camera, tilt plate, or spacing) are changed.
- For best results, perform tilt adjustments in a stable environment (minimal temperature change, fully cooled optics and sensor).
- Avoid overtightening, which may deform the sensor platform or affect collimation.
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 Off-axis Guide System
When installing an off-axis guiding system, the CAA Locking Knob may interfere when rotating the camera. In this case, you can replace it with the included H4 set screw to avoid the conflict.
