lens model in EXIF not showing in Aperture 2.1.2

debbie · 11-05-2008, 02:45 PM

Anyone experienced this?? I have K20d with DA and DA* lenses used with Aperture 2.1.2.
Shouldn´t this info be in the EXIF?? I am missing something??

*LeoTaylor* · 11-05-2008, 05:42 PM

Pentax Photo Browser and PhotoME both show lens information, so the info is in the EXIF. Aperture appears to be an Apple program so I have no knowledge of its weaknesses.

**Marc Sabatella** · 11-05-2008, 07:45 PM

Sometimes lens info is recorded in EXIF as plain text that any EXIF-aware program can display, but sometimes it is displayed as numeric codes that the program has to interpret according to some table it has of which lenses use which codes. In the case, a program can't display info about lenses not in its table. Sometimes there is an update released for an application just to make sure it knows about new lenses (usually, though, these are combined with releases to support new camera model RAW formats).

ghost · 11-05-2008, 11:17 PM

well, if I'm not mistaken, EXIF is just numbers, and the program has to know how to decode the EXIF. So maybe pentax is not fully supported by apple.

I just recently downloaded PhotoME, and I found out that the K100D has a thermometer built in! I found it odd and amazing? The temp is only found in the RAW file though.

debbie · 11-06-2008, 04:15 AM

ok, thanks for helping me out here.
It seems like you are right Ghost, Pentax is not fully supported in Aperture on this one.
Found some answers on Apples support site.

alohadave · 11-06-2008, 06:05 AM

Originally Posted by ghost

well, if I'm not mistaken, EXIF is just numbers, and the program has to know how to decode the EXIF. So maybe pentax is not fully supported by apple.

I just recently downloaded PhotoME, and I found out that the K100D has a thermometer built in! I found it odd and amazing? The temp is only found in the RAW file though.

Interesting! I'll have to check that out.

*LeoTaylor* · 11-15-2008, 07:38 PM

Originally Posted by ghost

...

I just recently downloaded PhotoME, and I found out that the K100D has a thermometer built in! ....

Sort of. I found the temperature in PhotoME as well. Since I do a lot of long exposure astrophotography and noise from heat is a major issue for me, I was very interested in the reading. Unfortunately I have not found any correlation of the temperature displayed in PhotoME and the ambient temperature nor the noise that goes up rapidly with long exposures.

I wonder if anyone reading this has an idea where the Pentax temperature sensor is located and what it represents?

*clawhammer* · 01-24-2009, 04:23 PM

Resurrecting on old(er) thread here because I discovered something today and would like some feedback.

I've had this same problem with my K10D and Aperture (both 1.5 and 2.x). Today, as I was mucking around, I discovered that when I switch the RAW Fine Tuning mode from 1.1 to 2.0 (or 2.0 to 1.1), I suddenly get correct Lens Model information in the metadata. Can anybody else who shots RAW try this out and see if it's reproducible across other setups?

*jbinpg* · 01-24-2009, 05:36 PM

Originally Posted by LeoTaylor

Sort of. I found the temperature in PhotoME as well. Since I do a lot of long exposure astrophotography and noise from heat is a major issue for me, I was very interested in the reading. Unfortunately I have not found any correlation of the temperature displayed in PhotoME and the ambient temperature nor the noise that goes up rapidly with long exposures.

I wonder if anyone reading this has an idea where the Pentax temperature sensor is located and what it represents?

Leo - I believe the temperature is recorded at the beginning of the exposure. So depending how long your shutter is open and how long you left the camera to cool before beginning, it is something to keep in mind. I will be doing some star trails tonight with my K20 and I plan on letting it cool to ambient (-23C) before beginning the session. Will see what the recorded temperature is from those shots.

Jack

flyer · 01-24-2009, 05:47 PM

The data reported by Photo ME is the interpretation of the guy who did the Photo ME software, so what he thinks is the temperature might be something else. He deducted what the information in the EXIF means by collecting a lot of info and figuring out what it can be. Since Pentax (or any other manufactures) don't tell anybody what means what, it is all open to interpretation. Most of the information collected by Photo ME is accurate, but there might be some that are off. The software writer admitted so himself in a previous post. If you search deep enough, you will find another thread discussing Photo ME where the author says he had to figure out quite a few information by correlating and figuring what means what.

cottonM · 01-24-2009, 10:53 PM

Originally Posted by clawhammer

Resurrecting on old(er) thread here because I discovered something today and would like some feedback.

I've had this same problem with my K10D and Aperture (both 1.5 and 2.x). Today, as I was mucking around, I discovered that when I switch the RAW Fine Tuning mode from 1.1 to 2.0 (or 2.0 to 1.1), I suddenly get correct Lens Model information in the metadata. Can anybody else who shots RAW try this out and see if it's reproducible across other setups?

I responded to this over on the Apple Aperture boards too. The RAW 2.0 to 1.1 roundtrip didn't work for me BUT 2.0 to 1.0 did! Strange! When I went from 2.0 to 1.1 I did see the lens data for a flash but with the 2.0 to 1.0 roundtrip the data stuck.

Anyone with Automator or Applescript mojo able to get this corrected in the library and in downloaded images? That would be nice.

But nicer would be for Apple to fix this ASAP. Clearly the data is there. Aperture knows the camera brand and model so it should be able to find the lens data and put it in the right field. Come on Apple. If users want action give them feedback at <http://www.apple.com/feedback/aperture.html>.

*jbinpg* · 01-24-2009, 11:33 PM

Seems Flyer may be right about the decoded Camera Temperature EXIF value being of dubious value. Consider the following EXIF output from two different programs on a photo I just took of star trails in my backyard. Ambient temperature -21 Celsius:

1) exiftool - widely used and respected app written by Phil Harvey in the Perl language:

$ exiftool -s -CameraTemperature K20D8994.PEF
CameraTemperature : -4 C

2) exiv2 - another EXIF data extractor, written in C++ so it is blazingly fast:

$ exiv2 -pt K20D8994.PEF | grep Temperature
Exif.Pentax.Temperature SByte 1 252 C
Exif.Pentax.ColorTemperature Short 1 0

Both of these programs are (supposedly) decoding the same hex value of 0x0047 for camera temperature:

For exiftool -
$ exiftool -H -CameraTemperature K20D8994.PEF
0x0047 Camera Temperature : -4 C

For exiv2 -
See Exiv2 - Image metadata library and tools where it is listed as 0x0047

Note that if one changes the 252C to 252K in the exiv2 output then the temperature is bang on (melting point of water is 273.15K = 0 C). No idea how exiftool comes up with -4 C. I will keep an eye on this over varying temperatures to see if a pattern emerges.

Jack

*LeoTaylor* · 01-26-2009, 06:21 PM

Originally Posted by jbinpg

Seems Flyer may be right about the decoded Camera Temperature EXIF value being of dubious value. .... Jack

Interesting data! My only EXIF extractor is PhotoME. I checked a few samples of astrophotos taken last summer and last week. I'd guess that the ambient temperature was in the 20s last July after dark and I know this week we went below 0 F several nights.

Summer start of session = 24 C
Summer end of session = 26 C
Winter start of session = -7 C
Winter end of session = -16 C

The results are at least reasonable. I'll collect more scientific measurements the next time I'm out in the observatory. As I noticed last year there is little rise during the session, on the cold night the reading went down! I've measured rapid noise increase with a series of long images. So I'll guess that the Pentax temperature sensor is not in contact with the image sensor. Its purpose may be to simply measure the ambient.

Odd that you mention Kelvin. A couple of weeks ago I made a temperature sensor using an LM335 IC. When supplied a current the sensor provides 10mv per degree K. When plugged into a voltmeter freezing is a convenient 2.73 volts. I've become quite fluent in converting Kelvin to Fahrenheit.

I'm still looking for an opportunity to take some more startrail photos. Twice I drove to a dark site based on good weather predictions and twice I was clouded out. Startrails are not forgiving, even a single cloud passing through the wide FOV ruins the session.

I see you are from British Columbia. I once enjoyed a nice holiday in Vancouver and Victoria!

*jbinpg* · 01-26-2009, 07:12 PM

I was out last night with the K20D and took a star trail shot. Came out decently at -25 C. New Moon (Chinese New Year) last night so conditions were ideal. It's in the Night Scenes section of the User Gallery here.

Jack

P.S. - I grew up in Vancouver. Nice place to visit but like all bigger cities now, it is too expensive to live there.

**Damn Brit** · 01-26-2009, 08:20 PM

Thread moved to Post Processing and Software.