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Astronomy > Telescopes > William Optics > Cat > William Optics Apochromatic refractor AP 91/448 RedCat 91 WIFD OTA
Product no.: 85222

Apochromatic refractor AP 91/448 RedCat 91 WIFD OTA

$ 3,770.00 incl. VAT plus shipping costs
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This product is available in the following variants:
Colour Price
black $ 3,770.00
red $ 3,770.00

Product description

More about the series Cat...

The AP 91/448 optics are an impressive combination of compact dimensions, relatively low price and outstanding optical quality, and are aimed at all astrophotographers and nature photographers. At the heart of the optical design is the Petzval design consisting of 4 elements in 3 groups, using FPL53 and FPL51 glass. The result is a colour-pure, corrected image field with a diameter of over 55 millimetres – making it suitable for full-frame cameras! The fast aperture ratio of f/4.9 allows for short exposure times.

An M48 and M54 thread is provided for connecting the camera. Two suitable adaptors are already included in the scope of delivery. Focusing is helical, i.e. by turning the easy-grip ring on the tube. This means that even heavy cameras are no problem. The telescope has a "WIFD" design, which stands for "with internal focus design". Focusing via the helical ring is therefore internal.

The included prism rail offers two connection options: for screwing with a photo thread, via Arca-Swiss mounting or for insertion into a prism clamp according to Losmandy standard. With these options, it should be no problem to attach the telescope to all common photo tripods, camera mounts or astronomical mounts.

The scope comes with a protective nylon carrying bag and a specially designed Bahtinov mask. This mask helps with focusing and is permanently integrated into the lens attachment.

Optics such as the Cat 91 are ideal for photographers who are dedicated to the night sky, but also to animal photography. With the Cat 91, you not only get impressive optical performance, but you can also enjoy the durable and beautiful finish of William Optics.

It not only matters which telescope you buy but also where you buy it. Our additional services:

  • We are a leading telescope dealer and know the devices we sell. Our customer service team will gladly help you after your purchase if you have problems with assembly or operation.
  • We provide a copy of the 80-page Telescope ABC beginners handbook with every telescope.

Specifications

Optics


Type
Refractor
Type of build
Apochromat
Aperture (mm)
91
Focal length (mm)
448
Aperture ratio (f/)
4,9
Resolving capacity
1,52
Limit value (mag)
12,3
Light gathering capacity
170
Max. useful magnification
182
Tube weight (kg)
6,3
Tube length (mm)
556
Tube material
Aluminium
Coating
multiple
Tube construction
Full tube
lens design
Quadruplet

Focuser


Tilting Adaptor
yes
Type of build
Helical
Connecting threaded socket (camera-side)
M48 / M54
Free aperture (mm)
55
Rotating
yes

Mount


Type of build
OTA
Mounting type
no mount

Included accessories


Dew Shield
yes
Carry case
yes
Miscellaneous
Bahtinov focus mask
Prism rail
yes
Thread for camera tripod
yes
Corrector
integrated
Eyepiece adaptor
1,25" & 2"

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

Product safety

Manufacturer: William Optics Co. Ltd, TW, [email protected]
Responsible person: NIMAX GmbH, Otto-Lilienthal-Str. 9, 86899 Landsberg am Lech, DE, [email protected]

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*All prices include VAT plus shipping costs.

William Optics Apochromatic refractor AP 91/448 RedCat 91 WIFD OTA
William Optics Apochromatic refractor AP 91/448 RedCat 91 WIFD OTA
William Optics Apochromatic refractor AP 91/448 RedCat 91 WIFD OTA
William Optics Apochromatic refractor AP 91/448 RedCat 91 WIFD OTA

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