Vixen Flattener HD Kit for FL55SS ES37252‑SO – Full‑Frame Field Flattener for FL55SS Refractor

Vixen

Price: $390.99 USD
List Price:
Price: $390.99 USD
Shipping calculated at checkout.

Get Sharp Stars Edge-to-Edge on Your FL55SS

Without a field flattener, stars at the edges of your photos look stretched or blurry even when the center is sharp — a natural optical effect in refractors. The Flattener HD Kit corrects this, delivering round, pinpoint stars across the full frame on both full-frame and APS-C cameras.

Unlike the Reducer HD Kit, this one keeps the focal length almost unchanged (300mm → ~312mm), so your field of view stays similar while image quality improves significantly.

Note: compatible with the FL55SS refractor only.

Who This Is For

  • FL55SS owners whose deep-sky photos have soft or distorted stars near the edges
  • Full-frame and APS-C DSLR/mirrorless camera users wanting cleaner, sharper star fields

Key Features

  • Covers a 44mm image circle — full-frame sensor coverage
  • Up to 96% illumination at the edges — greatly reduces vignetting (darkening at the corners)
  • Minimal focal length change: 300mm → ~312mm (f/5.5 → f/5.7)
  • AS anti-reflection coating for high contrast and light transmission
  • Compact and lightweight: flattener lens is just 107g
  • Includes extension tube (EX Tube 66) for correct camera back-focus

Specs
Compatible scope FL55SS only
Focal length (with kit) ~312mm (f/5.7)
Image circle Φ44mm (full-frame coverage)
Edge illumination Up to 96%
Lens construction 1 group, 2 elements
Coating AS anti-reflection (≥99.9% per surface)
Flattener size / weight Φ58 × 30mm / 107g
Includes Flattener HD lens + EX Tube 66

Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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All telescopes on Telescope Wolves are hand-picked with beginners in mind. If you're unsure which telescope is right for you, check out our Telescope Buying Guide.
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