One question that I’ve received many times since I published this website is: are Ricoh Recipes compatible with Pentax DSLR cameras? Pentax and Ricoh are made by the same company, after all.
I don’t have a good answer because I don’t own a Pentax DSLR. If there is crossover compatibility it is completely unintentional—a happy accident, really. But I have received some feedback that there is indeed some compatibility, so the answer seems to be: yes and no.
For example, I received this message:
“On a Pentax KP, the only things that seem different between a KP and a GR III are Effect and Shading. Also the scale on WB adjustments–KP only goes to +/- 7, but has the same B/G/A/M, with the same categories. So I have the same Hue/Saturation, the three Contrast options, the same Highlight/Shadow/Noise options, as well as Clarity.
“I can somewhat replace Effect with the ‘Custom Image,’ but it uses some different categories (‘Kodak Slide’ recipe has to use ‘Vibrant’ instead of ‘Vivid’ so I’m not sure if it’s exactly the same). Cross Processing works really differently. There’s mostly only just one B&W category, but at least it has all the color filter simulations (including a nifty IR-style one). Most notably, there’s no Positive Film, so that axes a lot of these recipes off the bat.
“I guess there’s another difference: Digital Filters (which I’d need to use for high-contrast BW or Vintage) are mutually exclusive with Clarity. I either have to skip the filter or leave Clarity at 0.
“There does seem to be a lot of overlap (I mean, same company and similar era of camera), and a lot of what I’ve played with has looked pretty good. I think KodaKolor is my favorite so far.“
So it seems that some Ricoh Recipes are indeed compatible with some Pentax DSLRs (although it’s not clear how different it renders the picture), while other recipes are only partially compatible and some are not compatible whatsoever. If you have a Pentax DSLR and you find a recipe that works for you, I would love to know.
RITCHIE'S RICOH RECIPES 
Are the recipes compatible with the GXR A12? Thank you.
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I don’t have a GXR A12, but reading through the manual makes me believe that these are not compatible with that camera. I don’t know for certain if the GR/GR II recipes are or are not compatible, but I didn’t find anything in the manual to indicate that they are, so my guess is no.
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