On Feb 16, 2013, at 11:00 AM, Aahz Maruch wrote: > On Sat, Feb 16, 2013, Larry Colen wrote: >> On Feb 16, 2013, at 9:04 AM, Aahz Maruch wrote: >>> >>> AFAICT, common wisdom is to set these values on the K-5/K-5 II: >>> >>> Highlight Correction on >> >> So far as I know, Highlight correction only affects the JPEGs, so it >> doesn't have any effect on photos that you actually care enough about >> to process correctly. > > Weird, I could have sworn I saw something that said that highlight > correction applies to RAW but shadow correction only applies to JPEGs. > But now I can't find anything like that in any of the manuals. [...] > Here's something I found: > > http://www.pentaxforums.com/forums/pentax-k-5/133189-anyone-using-expanded-dynamic-range-feature-your-k5.html
I think that the answer that you're looking for is here in the link you posted: Originally posted by mccamp82 Is it because the camera is, in a way, using ISO 80, underexposing a little to avoid clipping highlights, then processing the image in the camera to correct it for exposure while leaving the highlight areas underexposed. Or something similar? Yes, it's that. The camera actually shoots at ISO80 (instead of ISO160) so 1EV underexposed and then corrects the exposure by whatever amount is needed to preserve the highlights, e.g. applies +0.7EV for that particular photo when generating the jpg output. This also affects raw because the raw is 1EV underexposed. If you take the same shot with D-Range on and off with same settings (e.g. F2.8, 1/100, ISO160 for both photo) then in some raw converters (e.g. Raw Therapee 2.4) you'll see that the photo with d-range on is exactly 1EV underexposed (due to being shot at ISO80, 1EV less than ISO160). On the other hand some raw converters notice the d-range on in the exif and automatically "correct" the exposure by adding 1EV, therefore in these raw converters you won't see any difference between the two shots. Originally posted by mccamp82 Would it be similar to me doing my own version of underexposing a little, then going in to Adobe camera RAW and raising the fill light to expose the shadows areas, and using recovery to keep the highlights under control? Yes, more or less. If you shoot raw then you can just as well set -0.3EV (or whatever you prefer) as a general exp.compensation on your camera and then correct the exposure in your raw converter by applying whatever exp.compensation (or "fill light" or custom curve or whatever you prefer) is needed for a pleasing exposure without clipping highlights. Shadow correction just lifts up (brightens) the shadows during jpg processing. If you shoot raw then it doesn't matter, you can do the same in your raw converter by using whatever tool/slider it has to brighten the shadows. >From PentaxForums.com: >http://www.pentaxforums.com/forums/pentax-k-5/133189-anyone-using-expanded-dynamic-range-feature-your-k5.html#ixzz2L6ezmAHV My interpretation is that the K-5 has such incredible dynamic range (I've recovered shots > 5 stops under exposed), that what they do is under expose by a stop to get more headroom at the high end, and then boost the exposure in post processing. In other words a fast and sloppy version of expose to the right, where they don't actually look to see where the highlights fall on the exposure. The important thing to remember is that ideal exposure for JPEG is not ideal exposure for RAW. When shooting for JPEG you want to expose so that the object of interest has the best exposure. When shooting for RAW you want to expose so that you don't lose any important data to either clipping at the high end, or noise at the low end, and you adjust the final results in post processing. > > Guess that'll teach me to trust dpreview.com as a source of > information... ;-) When I first got my K100 I spent a lot of time hanging out on the dpr pentax forum. I have since realized that most online photography forums have a few experienced members and are mostly newbies, and people that have been doing photography just long enough to discover that if they use a fast lens, a wide aperture and manual exposure they can do neat things using limited depth of field to isolate their subject. As in any field they are the typical low-intermediate that think that they are advanced, who pontificate on anything. Imagine me, with even less technical knowledge, and you're getting close. > >>> Anyone want to argue against these? Any other defaults people recommend? >>> >>> One moderate annoyance I discovered while playing with John's K-5/60-250: >>> the playback button is on the left side, which makes it awkward to reach >>> with the right hand when holding the lens in the left (to review a photo >>> immediately after taking it, especially with the camera up near my face). >>> Larry suggests using digital preview, which would probably work, although >>> that somewhat changes the habits I've built up over the years. Any other >>> suggestions? >> >> My default is to show the blinkies on review so I can see where I'm >> clipping or losing detail. >> >> I set the function button, next to the lens, to astrotrace so that >> when I hit it accidentally, it doesn't put me into some mode that is >> hard to get out of. > > Good ideas. Also, if you are shooting RAW+, if you maximize the quality of your JPEG it'll take almost as much space as a RAW file, at least on a K20 (probably about half the space of a RAW on a K-5 because of 8vs 14 bits), i.e. a lot of space. I'd optimize your jpegs for web viewing, because you'll want to use RAW for prints, especially if you're going to the bother to get the K5II-S. > -- Larry Colen [email protected] sent from i4est -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
