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Description
William Optics Apochromatic refractor AP 51/250 RedCat 51 OTAFeatures The William travel apochromat RedCat 51 K. RC51lx Gen. 1. 5 is perfectly suited for astrophotography and nature photography on photo tripods or travel mounts. Aperture 51 mm focal length 250 mm focal ratio f 4. 9 Petzval design with chromatic aberration free FPL53 objective (4 elements in 3 groups) Very well corrected image field of 44 mm diameter even suitable for full frame cameras Camera connection via male M48 thread (suitable adapters
Features
The William travel apochromat RedCat 51 K.RC51lx Gen. 1.5 is perfectly suited for astrophotography and nature photography on photo tripods or travel mounts.
♦ Aperture 51 mm / focal length 250 mm / focal ratio f/4.9
♦ Petzval design with chromatic aberration free FPL53 objective (4 elements in 3 groups)
♦ Very well corrected image field of 44 mm diameter - even suitable for full-frame cameras
♦ Camera connection via male M48 thread (suitable adapters are available) - working distance 55 mm
♦ 360° rotation of the camera for the right display window
♦ Camera Sensor Tilt Fine Adjuster
♦ Focusing via precise helical focuser
♦ Thread for mounted 2" filters (M48x0.75 thread, female) when used as camera lens
♦ Optional Amici prism for attaching eyepieces for visual use - the 2" filter threads can´t be used then
♦ Flexible dovetail bar at the base (long version), suitable for Vixen style saddle plates, Arca-Swiss style saddle plates, and with female 1/4" photo thread
♦ Nylon carry case and Bahtinov mask for astrophotography are included in the scope of delivery
♦ Tube length only 225 mm / weight only 1.5 kg - perfect for on the way
Description
William Optics RedCat 51 Travel Apochromat for Astrophotography and Nature Photography
This apochromatic refractor is intended for all astro-photographers and nature photographers who are searching for a transportable and tack-sharp telephoto lens. Due to the 4-element Petzval design, a fully corrected image field of 44 mm diameter without chromatic aberration is achieved. Thus even the deployment of full-frame cameras is possible. However, with 225 mm length, the apo is not larger than a normal telephoto lens. But it can do much more.
The application areas of the RedCat 51 apo:
♦ Astrophotography
With 250 mm focal length and fast f/4.9, short exposure times are possible. The working distance of 55 mm allows using all popular astro cameras and DSLR/SLR cameras. Due to the 2" filter thread which is integrated in the helical focuser, using nebula filters is also possible. Include in the scope of delivery is a Bahtinov mask. The mask helps when focusing and is integrated in the objective cap.
♦ Countryside photography and animal photography
The RedCat 51 is also perfect for, for example photographing animals. The slip-proof helical focuser allows focusing within seconds. The image quality will impress you.
♦ Observation with eyepieces
Of course you can also observe with the RedCat 51. With the optional star diagonal almost all popular 1.25" eyepieces can be attached. The angled view is helpful when observing objects close to the zenith as well as when observing nature at daytime, the design as Amici prism provides a correctly orientated image. You can find this item, as well as a matching eyepiece, in the accessories section.
Specifications:
Optics |
|
| Type | Refractor |
| Type of build | Apochromat |
| Aperture (mm) | 51 |
| Focal length (mm) | 250 |
| Aperture ratio (f/) | 4,9 |
| Resolving capacity | 2,71 |
| Limit value (mag) | 10,3 |
| Light gathering capacity | 50 |
| Max. useful magnification | 102 |
| Tube weight (kg) | 1,5 |
| Tube length (mm) | 225 |
| Tube material | Aluminium |
| Coating | multiple |
| Tube construction | Full tube |
| dew cap diameter (mm) | 80 |
| lens design | Quadruplet |
Focuser |
|
| Tilting Adaptor | yes |
| Type of build | Helical |
| Connecting threaded socket (camera-side) | M48 |
| Backfocus (mm) | 59,7 |
| Free aperture (mm) | 44 |
| Rotating | yes |
Mount |
|
| Type of build | OTA |
| Mounting type | no mount |
Included accessories |
|
| Dew Shield | yes |
| Carrying bag | yes |
| Miscellaneous | Bahtinov focus mask |
| Prism rail | Arca-Swiss & Vixen-Style |
| Corrector | integrated |
Area of application |
|
| Astrophotography | highly recommended |
| Moon & Planets | yes |
| Nature Observation | yes |
| Nebulae & galaxies | yes |
| Sun | no |
Recommended for |
|
| Beginners | no |
| Advanced | yes |
| Observatories | no |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy