Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?

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SigmaTog
SigmaTog Contributing Member • Posts: 951
Re: Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?

Thank you very much.

Heritage Cameras
Heritage Cameras Senior Member • Posts: 1,535
Re: Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?
3

D Cox wrote:

SigmaTog wrote:
How do I ascertain which rangefinder cameras have, fixed-lens leaf-shutter, or focal-plane shutters, just by looking at a photo, please ?
I have only looked for older SLR cameras with the mirror box to see that the lens is interchangeable.

I don't think you could tell just from looking at a photo. Your best bet is to Google the model name and see if there's any info.

That's good advice. It's not always easy to tell by looking at a camera whether it has interchangeable lenses or not.

Cameras with bayonet mounts generally have a fairly obvious lens release button on the body (and/or sometimes on the lens), while those with a breech lock fitting usually have a milled ring either at the front of the body or the rear of the lens. With the various screw thread fittings it's often harder to tell visually that the lens comes off.

SLRs, rangefinder and viewfinder cameras have all been made with fixed and interchangeable lenses, plus some have convertible optics where the rear elements are permanently attached to the body while the front ones are replaceable.

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Dave, HCL

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eFilm Senior Member • Posts: 1,863
Re: Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?

Kharan wrote:

Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?

Nope.

I've read that the camera can register profiles for manual lenses

Where did you read that?

As far as I know the $400 Leica M Adapter L is currently the only manual lens adapter that can read the EXIF code hardwired on some Leica M lenses. Does it work with the fp, I haven't had a chance to try that yet.

Other than that the fp has the Lens Optics Compensation feature where you can fine tune colour shading and enter lens information like focal length and speed for your manual lenses.

You do that manually. The camera does not read anything from manual lenses. Nonetheless, that's the closest to registering profiles you were apparently referring to, and it's not that different from how it's being done in some other cameras as well.

but there's not a lot written about this, and the camera manual is massive.

If you say so. 
That's where the above info is, though, on pages 95 and 96, as listed in the table of contents.

Juha Kannisto Regular Member • Posts: 151
Re: Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?
1

eFilm wrote:

Kharan wrote:

Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?

Nope.

I've read that the camera can register profiles for manual lenses

Where did you read that?

As far as I know the $400 Leica M Adapter L is currently the only manual lens adapter that can read the EXIF code hardwired on some Leica M lenses. Does it work with the fp, I haven't had a chance to try that yet.

Other than that the fp has the Lens Optics Compensation feature where you can fine tune colour shading and enter lens information like focal length and speed for your manual lenses.

You do that manually. The camera does not read anything from manual lenses. Nonetheless, that's the closest to registering profiles you were apparently referring to, and it's not that different from how it's being done in some other cameras as well.

but there's not a lot written about this, and the camera manual is massive.

If you say so.
That's where the above info is, though, on pages 95 and 96, as listed in the table of contents.

I have that Leica adapter but I don't have any coded Leica M lenses. However, I don't think the adapter will do any lens registration with Sigma fp since there is no sign of any inbuilt lens profiles for adapted lenses in Sigma fp.

The lens compensation feature allows user to record up to 10 different color shading compensation profiles in-camera. User needs to shoot a reference image of a monotone surface with selected lens settings (such as aperture, focusing distance...) and then user can enter "Focal length / Aperture input" as one text string and "Note" as another string. Usually one would need more than 1 profile for 1 lens to have different levels of compensation for different apertures and shooting distances.

I have used this feature and (with color shading compensation images taken through an ExpoDisc shooting against the bright sky / sun). While shooting, user has to select the compensation profile to be used from #1 to #10 and then user has to change that setting whenever necessary. I put it in QS menu for quick access but it's still a bit cumbersome to have to switch the profiles e.g. when shooting with the same lens wide open or stopped down. Not sure if the Color Shading compensation related info including these text strings is recorded in EXIF at all. I haven't seen it in EXIF with my usual image viewing and editing tools but I haven't studied the EXIF in deep detail with e.g. ExifTool. Whenever the Color Shading compensation is in use, it will affect the DNG and JPEG so that the camera applies color shading compensation derived from the reference image for the selected profile. I don't know of any way to remove the compensation effect from DNG afterwards, didn't see any functional options for that e.g. in Sigma Photo Pro.

It would be nicer if the compensation profiles could be added in post processing e.g. in-camera or in Sigma Photo Pro selectively. Currently it's not possible to select to apply one of these 10 profiles e.g. when doing DNG editing in-camera, although it is possible to apply some basic level lens compensation settings and manual tuning of color shading compensation at that time.

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Kharan
OP Kharan Senior Member • Posts: 2,034
Re: Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?
1

SigmaTog wrote:

Thanks again
How do I ascertain which rangefinder cameras have, fixed-lens leaf-shutter, or focal-plane shutters, just by looking at a photo, please ?
I have only looked for older SLR cameras with the mirror box to see that the lens is interchangeable.

You can't, so you need to know your models. However, most of the more obscure rangefinder mounts have no adapters, or only limited-production, expensive ones.

I would start by getting L39/LTM/M39 lenses. The Soviets built a lot of inexpensive cameras and lenses with that mount, which was prominently used by the Zorki and FED lines. Affterwards, if you like them, there's all sorts of other lenses made for it, by Leica, Canon, Nikkor, Minolta, and Enna for Corfield (under the moniker 'Lumax') and lots of other German lenses for the longer registration of the Braun Paxette series - Steinheil, Schneider-Kreuznach, Enna, Staeble...

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Kharan
OP Kharan Senior Member • Posts: 2,034
Re: Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?

eFilm wrote:

Kharan wrote:

Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?

Nope.

I've read that the camera can register profiles for manual lenses

Where did you read that?

As far as I know the $400 Leica M Adapter L is currently the only manual lens adapter that can read the EXIF code hardwired on some Leica M lenses. Does it work with the fp, I haven't had a chance to try that yet.

Other than that the fp has the Lens Optics Compensation feature where you can fine tune colour shading and enter lens information like focal length and speed for your manual lenses.

You do that manually. The camera does not read anything from manual lenses. Nonetheless, that's the closest to registering profiles you were apparently referring to, and it's not that different from how it's being done in some other cameras as well.

but there's not a lot written about this, and the camera manual is massive.

If you say so.
That's where the above info is, though, on pages 95 and 96, as listed in the table of contents.

Thank you for answering on impulse instead of reading all of the (short) thread.

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I want to look at life
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eFilm Senior Member • Posts: 1,863
Re: Does the Sigma fp record the focal length of adapted, non-electronic lenses in the EXIF?

Juha Kannisto wrote:

I have that Leica adapter but I don't have any coded Leica M lenses. However, I don't think the adapter will do any lens registration with Sigma fp since there is no sign of any inbuilt lens profiles for adapted lenses in Sigma fp.

Right, there are no lens profiles and there's no lens registration. The Leica adapter can simply transfer exif data from newer Leica lenses. That's all it does.

I've got a coded Leica lens but not the Leica adapter, so I haven't been able to test if the fp can read the exif code like the CL/TL cameras do.

Usually one would need more than 1 profile for 1 lens to have different levels of compensation for different apertures and shooting distances.

I think the feature might sometimes be useful with certain 'exotic' lenses that have a distinctive colour cast or something which you'd like to dial down a bit for certain shooting scenarios. I wouldn'd bother to, nor have I used it so far, especially since I mostly shoot in RAW, anyway. I also tend to choose, and sometimes avoid, certain lenses based on their colour character and highlight rendition.

It's an interesting 'bonus feature' in the menu, though, and a one that might get a tweak or two in the next x.0 firmware updates.

Not sure if the Color Shading compensation related info including these text strings is recorded in EXIF at all.

I don't think so. After all, it's merely a 'preset' for a given lens. A "lens LUT" of a sort, which is separate from the actual lens metadata.
But more to the point of the original topic, it doesn't change the fact that there's no exif info transferred from fully manual, non-electronic lenses, besides that one possible exception mentioned above.

Whenever the Color Shading compensation is in use, it will affect the DNG and JPEG so that the camera applies color shading compensation derived from the reference image for the selected profile. I don't know of any way to remove the compensation effect from DNG afterwards, didn't see any functional options for that e.g. in Sigma Photo Pro.

Yeah, too bad if it's baked in, but maybe the idea is that the compensation selected is supposed to behave like the hardware compensations baked in the RAW files delivered by some native lenses as well.

It would be nicer if the compensation profiles could be added in post processing e.g. in-camera or in Sigma Photo Pro selectively. Currently it's not possible to select to apply one of these 10 profiles e.g. when doing DNG editing in-camera, although it is possible to apply some basic level lens compensation settings and manual tuning of color shading compensation at that time.

The generic DNG format apparently does not support such a 'side car' functionality.

Kharan wrote:

Thank you for answering on impulse instead of reading all of the (short) thread.

You're welcome.

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