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WILLIAM OPTICS
The AP 51/250 refractor is an impressive combination of compact size, attractive price and outstanding optical quality which is suitable for all astro- and nature photography.
Available within 5-14 days
This includes products that we do not keep in stock but are only available on request or have been announced by the manufacturer. For orders of these items, a deposit is required, proportional to the total value of your order. As soon as we receive your order, we will notify you by e-mail or telephone, for the exact delivery time and the amount of the deposit.
WILLIAM OPTICS REDCAT 51 APO
William Optics RedCat 51/250 mm f/4.9
The AP 51/250 refractor is an impressive combination of compact size, attractive price and outstanding optical quality which is suitable for all astro- and nature photography. At the heart of the optical set-up is the Petzval design comprising four elements in three groups in which FPL53 and FPL51 glass has been utilised. The result is a colour-rich corrected image field with a diameter of more than 44 mm - perfect for full-frame cameras. The fast focal ratio of f/4.9 allows short exposure times.
For camera connection there is a M48 thread. Appropriate T2 adapters can be found under “recommended accessories”. Focusing is helical - so by twisting the textured ring on the telescope body even heavy cameras are no problem.
The 110mm long dovetail bar offers three connection alternatives; screw connection with a photo thread, Arca Swiss or Vixen standard fittings. With these three options it should be no problem to connect this telescope to all the usual photo tripods, photo mounts or astronomical mounts.
Not only is a protective nylon carrying case included, but also a specially devised Bahtinov mask. This mask helps with focusing and is built into the lens cap.
A telescope such as the RedCat 51 is ideal for photographers who are interested in the night sky and also animal photography.
With the RedCat 51 you are not only investing in impressive optical performance, but you will also be thrilled by the durable and beautiful finish William Optics has achieved.
| Optical design | Apochromatic Refractor |
|---|---|
| Aperture (mm) | 51 |
| Focal length - F (mm) | 250 |
| Focal ratio (f/) | 4.9 |
| Mount | Not included |
| Maximum useful magnification (x) | 102 |
Technical Data
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 |
General |
|
| Series | Cat |
| Colour | red |
Area of application |
|
| Astrophotography | yes (very good) |
| Moon & Planets | yes |
| Nature Observation | yes |
| Nebulae & galaxies | yes |
| Sun | no (Only with appropriate Sun filter) |
Recommended for |
|
| Beginners | no |
| Advanced | yes |
| Observatories | no |
All orders we receive until 15:00 concerning products in our warehouse, processed on the same day
Well-trained scientific and technical personnel are available to you at any time, to solve the questions and concerns about your equipment.
If you are not satisfied with the product you received, you can return it within 14 days of receipt.
Experience you can trust. Planetarium of Thessaloniki is the largest supplier of astronomy goods in the Balkans
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