Edited pi-pan-tilt part 3 a little; added raspistill note

posts/2016-10-12-pi-pan-tilt-3.md

@@ -33,13 +33,10 @@ I may have mentioned in the first post that I'm using
 [another][arducam_omx219] that uses the 8-megapixel Sony OMX 219, but
 I haven't gotten my hands on one yet.)
 
-If you are expecting the quality of sensors and exposure control that
-even an old entry-level DSLR camera provides, this board will probably
-disappoint you.  The sensor is tiny, it's noisy, and capturing still
-images is quite slow (6-7 seconds, in my tests).
-
-However, if you are accustomed to basically every other camera that is
-within 2-3 times the price and is meant to interface directly with a
+If you are expecting the quality of sensor even an old DSLR camera
+provides, this board's tiny, noisy sensor will probably disappoint
+you.  However, if you are accustomed to basically every other camera
+that is within double the price and interfaces directly with a
 computer of some kind (USB webcams and the like), I think you'll find
 it quite impressive:
 
@@ -52,9 +49,9 @@ it quite impressive:
   more detail on optics in a later post.
 - [raspistill][] will provide 10-bit raw images straight off the
   sensor (see its `--raw` option).  Thus, we can bypass all of the
-  automatic brightness, saturation, contrast, and whitebalance which
-  are great for snapshots and video, but really annoying for composite
-  images.
+  automatic brightness, sharpness, saturation, contrast, and
+  whitebalance correction which are great for snapshots and video, but
+  really annoying for composite images.
 - Likewise via [raspistill][], we may directly set the ISO speed and
   the shutter time in microseconds, bypassing all automatic exposure
   control.
@@ -71,6 +68,18 @@ to raspistill, and it will produce a JPEG file which contains a
 normal, lossy image, followed by a binary dump of 10-bit raw Bayer
 data from the sensor.
 
+Most of my image captures then are with something like:
+
+    raspistill --raw -t 1 -w 640 -h 480 -ss 1000 -ISO 100 -o filename.jpg
+
+That `-t 1` is to remove the standard 5-second timeout; I'm not sure
+if I can take it lower.  `-w 640 -h 480 -q 75` applies to the JPEG
+image, while the raw data with `--raw` is always full-resolution; I'm
+saving only a much-reduced JPEG as a thumbnail of the raw data, rather
+than wasting the disk space and I/O on larger JPEG data than I'll use.
+`-ss 1000` is for a 1000 microsecond exposure (thus 1 millisecond),
+and `-ISO 100` is for ISO 100 speed (the lowest this sensor will do).
+
 # Converting Raw Images
 
 People have already put considerable work into converting these rather