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Telescopes > William Optics > Cat > William Optics Apochromatic refractor AP 51/250 RedCat WIFD OTA
Product no.: 82930

Apochromatic refractor AP 51/250 RedCat WIFD OTA

$ 1,200.00 incl. VAT, plus shipping costs
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Product description

More about the series Cat...

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.

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.

Our expert comment:

The RedCat 51 is probably one of William Optics’ most loved apochromats and not without good reason. It delivers perfect astrophotos of deep-sky objects and is easily transportable due to its small size.

(Jan Ströher)

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)
2,4
Tube length (mm)
346
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)
48
Adjustment range (mm)
0-23
Rotating
yes

Mount


Type of build
OTA
Mounting type
no mount

Included accessories


Dew Shield
yes
Carry case
yes
Miscellaneous
Focusing 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
no
Nebulae & galaxies
yes
Sun
yes (Only with appropriate Sun filter)

Recommended for


Beginners
no
Advanced
yes
Observatories
no

Recommended accessories

Telescope accessories > Transport & storage (6)
Carry case

Omegon carry case for 5" tubes/lenses

$ 99.00*
Telescope accessories > Other (6)

Omegon DUNEDRY dehumidifier

$ 29.90*
Eyepieces (3)
Eyepiece

Omegon Ultra Wide Angle eyepiece 9mm 1,25"

$ 69.00*
Eyepieces > Other (3)
Reticle eyepieces

Omegon Reticle eyepieces Illuminated crosshair eyepiece, 12.5mm

$ 89.00*
Filters > Nebulae filters (5)
Filters

Omegon Filters Nebula/ city light filter 1.25 ''

$ 39.90*
Filters > Other (3)
Filters

Omegon Filters Moon filter 1.25"

$ 19.90*
Astrophotography > Camera adaptor (3)
Projection adapter

Omegon Camera adapter 1.25"

$ 24.90*
Astrophotography > Camera mounts (4)

Omegon Easypic Universal Smartphone Adapter

$ 99.00*
Astrophotography > Other (3)
Camera

Lacerta Camera Standalone Autoguider MGEN Version 3

$ 1,020.00*
Observatories (1)

Omegon Tent observatory

$ 189.00*
Media (2)
Star chart

Omegon Star chart Planisphere

$ 14.90*
Outdoor (2)
Headlamp

Omegon LED headlamp

$ 13.90*
Globes & Maps (1)
Continental map

Oculum Verlag Sky Quality Map Europe

$ 18.90*
Solar Observation (2)

Baader Sun filter foil 20 x 29 cm

$ 31.90*
Maintenance & Cleaning > Lens cleaners (3)

Omegon 7-in-1 lens cleaning set

$ 19.90*
Maintenance & Cleaning > Other (2)

Omegon microfibre cleaning cloth 20cm x 20cm

$ 4.90*

*All prices include VAT plus shipping costs.

William Optics Apochromatic refractor AP 51/250 RedCat WIFD OTA
William Optics Apochromatic refractor AP 51/250 RedCat WIFD OTA
William Optics Apochromatic refractor AP 51/250 RedCat WIFD OTA
William Optics Apochromatic refractor AP 51/250 RedCat WIFD OTA

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