HD Pentax-D FA★50mm F1.4 SDM AW is listed for Pentax K with Full frame coverage. Its verified front filter size is Ø72 mm. Ricoh's Star lens specification lists a 72 mm filter diameter. Check the K-1 Mark II manual for feature settings.
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Verified specifications
| Field | Value |
|---|---|
| Mount | Pentax K |
| Mount subtype | KAF4 |
| Image format | Full frame |
| Front filter thread | Ø72 mm |
| Model ID | pentax-dfa50mm-f14 |
| Optical construction | 15 elements in 9 groups |
| Closest focus | 0.4m (1.3ft.) |
| Maximum magnification | 0.18x |
| Minimum aperture | F16 |
| Aperture blades | 9 Rounded diaphragm （50mm:F1.4-F2.8） |
The maker also lists 15 elements in 9 groups for the optical design and a closest-focus specification of 0.4m (1.3ft.). These are lens specifications, not a guarantee of performance on every body or in every shooting mode.
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Compare the exact model code and rear mount in each listing. Amazon results may contain another mount or generation; the search is not a compatibility verdict.
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Look for the Pentax K designation on the camera specification, then verify the exact model code and mount variant against its support page. A physical mount match is a starting point; still AF, movie AF, crop behavior, stabilization and firmware need separate checks.
Choosing a filter
A circular screw-in filter with a matching documented thread size is only a mechanical candidate. Magnetic filters, wide frames and stacked rings need separate system and vignetting checks. When no front thread is specified, do not buy a size from the focal length or barrel diameter.
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Official sources and scope
Checked for this reference on October 30, 2026. Product firmware and support lists can change; inspect the current maker page for your exact revision.