William Optics RedCat 51 Flatfield APO f/4,9

Full-frame correction, outstanding sharpness and color correction, very easy to use, ideal for traveling

Product variants

William Optics RedCat 51 Flatfield APO 51/250 mm f/4,9 (L-RC51)

incl. 27% VAT

1 234.07 €

Including 27% VAT:
1 234.07 € (499 800 HUF)

Net price (for non-EU customers):
971.71 € (393 543 HUF)

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Delivery:
Please contact our colleagues before ordering: +36-1-202-5651
Budapest shop:
Under procurement
Delivery:Under procurement
Bp. shop:Under procurement

More about the product

NEW VERSION!

The new version comes with a

built-in tilting device
new mounting ring
longer, Vixen Compatible dovetail bar
focusing index
(the CAT saddle Handle-Bar is still optional, available separately)

From the beginning, the goal was to create the best possible design for an affordable, small, lightweight and fast Apochromatic refractor for astro photography needs.

The unique optical design includes the highest quality glass for the best possible colour correction and flat field. The result is a 51mm objective lens, in a sleek Petzval design, using Synthetic Flouride (FPL53 and FPL51) glass for a full frame flat field image.

The optical quality provides exceptional performance at a fast focal ratio of f/4.9.

The premium quality red finish and calibrated helical focuser offers high-quality appearance.

The lens tube includes a specially designed base that provides light but solid mounting options, including a reversible base plate for either Vixen-style or Arca-Swiss mounting.

The Bahtinov mask, built into the cover helps to achieve perfect optical focus.

SPECIFICATIONS

Lens Type: Prime Lens
Focal Length: 250mm
Aperture: 51mm
Focal Ratio: f/4.9
Camera Format (compatibility): APS-C, Full Frame
Max Image Circle: Full Frame
Focus Mode: Manual Focus
Lens Structure: Petzval (4 elements in three groups)
Dimensions: 225mm x 80mm x 80mm
Weight: 1.47kg
Interchangeable T-mounts: Canon EF, Nikon F, Sony E, Pentax, Micro Four Thirds

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Gallery (6)

1 year warranty

3 years consumer warranty

Kardos Balázs's opinion

2022.03.23.

After a few weeks, months of usage

Optical quality

Mechanical quality

Price/Value ratio

William Optics RedCat 51 Flatfield APO 51/250 mm f/4,9

Pros

Remek kidolgozás, nem kell hozzá flattener, nem kell ügyelni a backfocusra.

Cons

Nem kapható itthon hozzá fókusz motor tartó, bár gondolom sokat nem adnak el a tubusból sem.

Summary

Nagyon jó nagy látószögű tubus. Mind a mechanikai kidolgozása, mind a képalkotása számomra teljesen rendben van. Nincs hozzá szükség semmi plusszra. Harmatsapka, bathinov maszk, field rotator, flattener, tilt adapter, minden benne van, ami a fotózáshoz kellhet. Ez a második ilyen tubusom, sajnos az elsőt eladtam. Meg is bántam ezért vettem mégegyet :)

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