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Black achromatic macro diopter lens with 52mm and 58mm threads

Opteka

Opteka Achromatic 10x Diopter Macro Lens 52mm 58mm Pentax K

SKU CH-440Z-XEP4S

A 10x achromatic diopter that fits 52mm and 58mm threads to turn Pentax K-mount lenses into macro tools with edge-to-edge sharpness

  • TypeMacro Lens
  • ColorBlack
  • CompatibilityPentax
  • Focus TypeAuto Focus
  • Camera MountPentax K
  • Filter thread (Diameter)58 mm
  • Achromatic two-element design eliminates chromatic aberration for sharp macro images
  • 10x diopter power enables up to 1:1.5 reproduction ratio for detailed close-ups
  • HD multicoated glass with anti-reflective coating preserves colour fidelity and contrast
  • Fits both 52 mm and 58 mm filter threads for versatile lens compatibility
  • Maintains full zoom capability and autofocus while adding macro function

Opteka 10x Achromatic Diopter

The Opteka Achromatic 10x Diopter Macro Lens attaches to 52mm or 58mm filter threads on Pentax K-mount lenses. It decreases the minimum focus distance to increase magnification for close-up photography. The two-element achromatic design corrects chromatic aberration for sharper results. It suits Pentax DSLR owners wanting macro capability without a dedicated macro lens.

Thread Mount and Aperture Limits

The lens fits filter threads measuring 52mm and 58mm in diameter. Autofocus function is retained when mounted on compatible Pentax K-mount cameras. Optical performance is optimised at middle apertures such as f/8 or f/11 for corner-to-corner sharpness. Wide-open apertures may reduce edge definition across the frame.

Magnification Range and Use Cases

The +10 diopter power enables reproduction ratios up to 1:1.5 or 1:2 for near life-size imaging. It works best with standard zoom or prime lenses that have the matching filter threads. It does not suit ultra-wide lenses where vignetting occurs or telephotos with insufficient close focus range. Buyers needing higher magnification beyond 1:1 will find the diopter reaches its limit.

Highlights

  • Achromatic two-element design eliminates chromatic aberration for sharp macro images
  • 10x diopter power enables up to 1:1.5 reproduction ratio for detailed close-ups
  • HD multicoated glass with anti-reflective coating preserves colour fidelity and contrast
  • Fits both 52 mm and 58 mm filter threads for versatile lens compatibility
  • Maintains full zoom capability and autofocus while adding macro function

Specifications

BrandOpteka
TypeMacro Lens
ColorBlack
CompatibilityPentax
Focus TypeAuto Focus
Camera MountPentax K
Filter thread (Diameter)58 mm
AutofocusYes

Questions about this item

Should I pick the 52 mm or 58 mm thread version?

The diopter ships with a 58 mm thread and includes a step-down ring so it also fits 52 mm lenses — no separate versions to choose.

What does the 10× diopter rating mean on my Pentax K body?

It shortens the minimum focus distance enough to reach roughly 1:1.5 or 1:2 reproduction on the sensor, turning a standard lens into a close-up tool.

Does the Pentax K mount affect autofocus or aperture control?

The diopter has no electronics; it mounts on the filter thread, so autofocus and aperture stay fully controlled by the host lens.

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