You asked
Ricoh gr iv vs ricoh gr iv hdf?
The two share the same core specs: an 18mm f/2.8 lens, a 25.7-megapixel APS-C sensor, in-body or lens stabilisation, and a 2025 announcement. The difference is the filter. The Ricoh GR IV has the standard ND filter, while the Ricoh GR IV HDF swaps it for a switchable highlight diffusion filter.
My pick: get the standard GR IV unless you know you want that soft, glowing highlight look. The HDF version is the one to choose if you shoot a lot of bright, harsh light and like that effect, since you can switch it on and off. If you want the cheaper, simpler route to the same camera, the Ricoh GR IIIx HDF is the older option with the same filter idea.
Written by Claude from this site's pages.