Compact and powerful RedCat for photography
The William Optics AP 91/448 91 RedCat is perfect for astrophotography and nature photography.It combines compact size with high optical quality.It Petzval design with FPL53 and FPL51 glass gives a color-clean, sharp image across the entire field.Your sensor sees everything, even up to full-frame size.

Fast and clear
With a 91 mm lens and f/4.9 capture a lot of light.That means short exposures and sharp details, even for faint stars.The field of view of more than 55 mm lets you create creative compositions without distortion.
Internal focusing
The WIFD focus works internally, so heavy cameras don't disturb anything.Turn the spiral ring and focus precisely.The included rotator and tilt flange Keep your image sharp everywhere.

Flexible mounting
The included dovetail rod works with Arca-Swiss, Vixen stand or photo wire.So you easily attach the telescope to any tripod or astronomical mount.
Ready to use
Included in delivery is a tote bag and a Bahtinov mask included.You can start night or nature photography right away.The durable red finish From William Optics stays beautiful for years
Specifications
Optics
| Feature | Description |
|---|---|
| Type | Refractor |
| Design | Apochromat |
| Aperture (mm) | 91 |
| Focal length (mm) | 448 |
| Focal Ratio (f/) | 4,9 |
| Resolution | 1,52″ |
| Limit value (mag) | 12,3 |
| Light output | 170 |
| Max. useful magnification | 182× |
| Tube weight (kg) | 6,3 |
| Tube length (mm) | 556 |
| Tube material | Aluminum |
| Coating | Multiple |
| Tube construction | Full tube |
| Lens Design | Quadruplet |
| Free opening (mm) | 55 |
Focuser
| Feature | Description |
|---|---|
| Design | Helical (internal) |
| Tilt adapter | Yes |
| Camera connection | M48 / M54 |
| Rotatable | Yes |
Mount
| Feature | Description |
|---|---|
| Design | OTA |
| Type of mount | Without |
Included accessories
| Section | Description |
|---|---|
| Dew cap | Yes |
| Transport bag | Yes |
| Dovetail | Yes |
| Corrector | Integrated |
| Focusing aid | Bahtinov mask |
| Oculai adapter | 1,25″ & 2″ |
General
| Feature | Description |
|---|---|
| Series | Cat |
| Color | Red |
| Observation goals | Astrophotography, Moon & Planets, Nature observation, Nebulae & galaxies |
| Sun | No (only with suitable sunscreens) |
| Recommended for | Advanced |
| Observatory use | No |





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