diff --git a/rtengine/camconst.json b/rtengine/camconst.json
index 7ddcefaba..5d0898ee9 100644
--- a/rtengine/camconst.json
+++ b/rtengine/camconst.json
@@ -1784,7 +1784,7 @@ Camera constants:
         "make_model": [ "RICOH PENTAX K-1", "PENTAX K-1" ],
         "dcraw_matrix": [ 8596,-2981,-639,-4202,12046,2431,-685,1424,6122 ], // adobe DNG v9.7 D65
         //"dcraw_matrix": [ 8566,-2746,-1201,-3612,12204,1550,-893,1680,6264 ], // PENTAX DNG
-        "raw_crop": [ 6, 18, 7376, 4932 ], // full frame 7392x4950, cropped to official DNG raw_crop 6,18,7382,4950, official jpeg crop 8,10,7360x4912
+        //"raw_crop": [ 6, 18, 7376, 4932 ], // full frame 7392x4950, cropped to official DNG raw_crop 6,18,7382,4950, official jpeg crop 8,10,7360x4912
         "ranges": {
             "white": [
                 { "iso": [ 100, 200, 400, 800 ], "levels": 16300 }, // 16380
diff --git a/rtengine/dcraw.cc b/rtengine/dcraw.cc
index 4daf451d0..4a5e7f1c8 100644
--- a/rtengine/dcraw.cc
+++ b/rtengine/dcraw.cc
@@ -8743,6 +8743,10 @@ void CLASS identify()
   if (width == 7424 && !strcmp(model,"645D"))
     { height  = 5502;   width  = 7328; filters = 0x61616161; top_margin = 29;
       left_margin = 48; }
+  if (width == 7392 && !strncmp(model,"K-1",3))
+    { left_margin = 6; width  = 7376; if(!dng_version) {top_margin = 18; height -= top_margin; }}
+  if (width == 4832 && !strncmp(model,"K-1",3)) // K-1 APS-C format
+     if(!dng_version) {top_margin = 18; height -= top_margin; }
   if (height == 3014 && width == 4096)	/* Ricoh GX200 */
 			width  = 4014;
   if (dng_version) {