645 LS135mmF4 is listed for Pentax 645 with 645 medium format coverage. Its verified front filter size is Ø58 mm. Ricoh lists this exact lens under its 645-mount catalog. Camera-specific electronic functions remain unassessed.
As an Amazon Associate I earn from qualifying purchases.
Verified specifications
| Field | Value |
|---|---|
| Mount | Pentax 645 |
| Image format | 645 medium format |
| Front filter thread | Ø58 mm |
| Model ID | pentax-645-645-ls135 |
Compare camera lenses listings
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.
(paid link)
Search camera lenses on AmazonChoosing a camera
Look for the Pentax 645 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.
Keep exploring
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.