Exif -- lens reporting incorrect data

He's pointing out that image is not "out of the camera." It is a resized copy has been processed by something.

exiftool says the jpg was created by "Microsoft Live Photo Gallery 15.4.3508"

Lens name could have been interpreted there or by Photobucket upload processor.

robertsmx wrote: I got that snarky/sarcastic remark (hence posted a still smaller version in the response).

Could you explain why you thought my question was snarky/sarcastic? It was a plain and straightforward question.

I only have an A850 and I do not claim to be an expert on even that camera. I do shoot raw, so I do not not about any of the in-camera jpg settings.

Reason for the first question: I have played with the exiftool extensively and my intention was to download the jpg file you uploaded and run exiftool on it to extract the lens id information. I was surprised to find out that the image was actually smaller than 16MP.

Reason for the second question: Your response to that would help me phrase my questions differently so that it does not appear snarky/sarcastic next time.

eccles wrote: It's feasible that Sigma have used the same lensid as the Sony 18-250mm. Robertsmx, if you can find out the lensid number, which will be a 3 to 5 digit integer, it may explain why your A55 recognises it correctly.

That is a possibility, and it would make sense to keep the same lens ID. However, the only other Sony lens I have at this time is SAL1650 SSM. With that lens, the EXIF shows up with "DT" prefix as in this case:
Camera Maker: SONY
Camera Model: SLT-A55V
Lens: DT 16-50mm F2.8 SSM
Image Date: 2012-01-22 21:05:07 (no TZ)
Focal Length: 16.0mm (35mm equivalent: 24mm)
Aperture: f/11.0
Exposure Time: 10.000 s
:

May be not all Sony lens IDs are tagged with DT for prefix.

Serdar A wrote: I only have an A850 and I do not claim to be an expert on even that camera. I do shoot raw, so I do not not about any of the in-camera jpg settings. Reason for the first question: I have played with the exiftool extensively and my intention was to download the jpg file you uploaded and run exiftool on it to extract the lens id information. I was surprised to find out that the image was actually smaller than 16MP. Reason for the second question: Your response to that would help me phrase my questions differently so that it does not appear snarky/sarcastic next time.

Never mind. I shouldn't have assumed that you were aware of image size settings in Sony SLT/DSLR cameras. The smaller size of the attached images is due to limited size allowed on the image hosting website. I am guessing a pro-membership would allow for full resolution image. And in any case, I wouldn't post full size images to share anyway because the point was about information being passed from camera to the image itself, not whether the image has been re-sized/cropped or not.

Edited by robertsmx - 27 February 2012 at 19:48

@Robertsmx can you tell us the lensid of the Sigma 18-250mm? JosR's link should help, alternatively if you have Photoshop use the file info option.

My Sigma 18-250 (OS HSM), 3 monts old reports ID 128 from a .ARW file taken on my a77. I used alphalensinfo and exiftool for this.

Cheers

Allan Olesen wrote: robertsmx wrote: Cropped, yes. And loaded to Photobucket (hence 800px wide). But ultimately, the camera is recording the EXIF (there is no way any software can figure out the lens without the camera passing down the information). In other words, A55 is recognizing the lens. Sorry, but that does not prove that the a55 is recognizing the lens. It only proves that it passes the lens ID number down to the image. It doesn't have to know the lens to do that. What you see is probably exiftool extracting the lens ID number from the image and translating it to a lens name.

But that is how any camera lens is identified, via lens ID. It can't be mere coincidence that the lens ID attached to Sigma 18-250 happens to coincide with just ONE other 18-250/3.5-6.3 lens on A-Mount (Sony 18-250). There's no reason to have a dedicated lens id for every lens in existence. As a matter of fact, even Sony and Minolta lenses share lens IDs.

Edited by robertsmx - 27 February 2012 at 22:01