| ₹ 131705.0 includes GST and import duties. | |
| B2B customers can avail ₹ 20085.01 ITC on this product | |
| 100% Secure Payments | 100% Genuine product | |
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Description
William Optics CAT 51 WIFD Overview
Designed for stargazing and astrophotography, the Cat 51 WIFD 51mm f/4.9 Apochromatic Refractor Telescope from William Optics uses an unorthodox design for supporting heavy cameras and delivers a wide field, a fast focal ratio, and a Petzval lens for beautiful images. The WIFD (William Optic Internal Focus Design) places the 10:1 rack-and-pinion focuser in the center of the optical tube, eliminating the tilt and vignetting that can occur from heavy cameras on traditional rear-mounted focusers. A four-element Petzval-style lens yields a sharp image with no need for a flattener and the dust cover has a built-in Bahtinov mask for tack-sharp star images. This optical tube assembly requires a mount and a tripod for use.
- Fast f/4.9 focal ratio and 250mm focal length for wide field of view and fast exposure times
- Apochromatic Petzval-style four-element lens produces rich views with minimal chromatic aberration
- Sharp image with no need for a separate field flattener
- Supports 48mm image circle for full-frame, APS-C, and micro four thirds cameras
- Dust cover with integrated Bahtinov mask allows for fine focusing on stars
- Built-in tilt adapter
- Camera angle rotation device
- M54 female thread for cameras, accessories, or eyepiece diagonals
- William Optics Internal Focus Design places focuser in center of OTA to balance the weight of imaging systems
- Precise internal sliding of fixed optics prevents image shift, ensuring stable and clear observations
- 10:1 coarse and fine focus rack-and-pinion design
- Compatible with ZWO EAF automatic focuser
- 0-23mm focus travel, ruler to 30mm Dial-style thermometer for gauging temperature effect on optical tube
- Anodized aluminum optical tube
- Sturdy mounting ring and handle assembly with 210mm Vixen-style dovetail
- Additional dovetail with thumbscrews on handle for guidescope or other accessory
Items Included
- William Optics Cat 51 WIFD 51mm f/4.9 Apochromatic Refractor Telescope (OTA Only)
- Bahtinov Cap
- M48 Cap
- Mounting Ring with Handle
- Dual Mounting Plate
- Mounting Ring Handle Bar
- Allen Key Set
- Soft Carry Case
- Limited 2-Year Manufacturer Warranty
Not Included
- Essential AC Adapters
Additional Resources
William Optics CAT 51 WIFD Specs
| Optical Design |
Apochromatic Doublet Refractor
|
| Aperture |
51 mm / 2"
|
| Focal Length |
250 mm
|
| Focal Ratio |
f/4.9
|
| Focuser |
Dual-Speed Rack-and-Pinion
|
| Weight |
5.25 lb / 2.38 kg
|
| Optical Design |
Apochromatic Doublet Refractor
|
| Aperture |
51 mm / 2"
|
| Focal Length |
250 mm
|
| Focal Ratio |
f/4.9
|
| Focuser |
Dual-Speed Rack-and-Pinion
|
| Diagonal |
No
|
| Finderscope |
No
|
| Mounting |
Vixen Style
|
| Optical Tube Dimensions |
13.6" / 346 mm
|
| Payload Capacity |
No
|
| Altitude Adjustment |
No
|
| Latitude Adjustment |
No
|
| Counterweight |
No
|
| Weight |
5.25 lb / 2.38 kg
|
| Package Weight |
8.935 lb
|
| Box Dimensions (LxWxH) |
16.6 x 10.7 x 9.5"
|
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Bulk Discount
| Quantity | Price |
| 2 | ₹ 129070.9 |
| 3-5 | ₹ 127753.85 |
| 5-10 | ₹ 125119.75 |
| 10+ | ₹ 122485.65 |
Bulk discount will be automatically applied during checkout based on quantity.