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Leica Elmarit 28mm 3rd ver. 6 bit coding


leex1298

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I just have my 28mm Elmarit 3rd ver. coded with Bo's templete and took a test shot. Now I can see the focal length which is 28mm from Metadata in Mac Aperture but it still says lens unknown. (when I use 35mm Summilux ASPH 6-bit coded, I can see all the lens data)

 

is it correctly coded?

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Welcome to the forum!

 

I have an Elmarit 28 ver.2, coded as a ver.3 by DAG. It shows all the information it's supposed to in Lightroom.

 

I've had some cases where a coded lens wasn't recognized when I first mounted it, but the camera caught it after several shots. But the recognition was always all or nothing.

 

Might be your coding, I suppose, but if half of the information is there, the problem may lie somewhere else.

 

But I'm completely inexperienced in Aperture, so there may be a problem there that I'm unaware of.

 

Maybe you should raise the question in the Digital Post Processing forum, where it's less likely to be overlooked. There are a lot of Aperture users around, so someone should get you an answer pretty quickly.

 

Good luck!

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Thanks for your comment. I tried Light Room and had the same result. I can see the focal length and shutter speed only but the lens name such as 'Elmarit' and aperture are not shown.

 

Now it makes me wonder how the camera finds out aperture from the lens? the picture from my friend's M9 has aperture data in Metadata. I thought the lens is 100% manual and only provides a lens type not aperture information.

 

I am wondering if everyone see the lens name from the meta data.

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Concerning the aperture: The camera compares illumination data from the blue dot on the front of the camera to the exposure calculated by the camera's meter to come up with an estimate of the aperture. To do so, of course, the camera has to know the maximum aperture of the lens from the lens ID code. At first, Leica kept the existence of the 'guestimate' hidden because they were afraid people would complain that it wasn't exact.

 

FWIW, I just re-checked my lens' data field. It reads "Leica Elmarit-M 28mm f/2.8 (III)."

 

You do have the latest version of Aperture, right? I think at one time the program may not have retrieved all the information. But if your 35's info shows up, so should your 28's.

 

I'm sure someone is around who can point you in the right direction. I've never used any of the DIY coders.

 

You have verified your coding with Carsten's Leica M Lens Codes, right?

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..... At first, Leica kept the existence of the 'guestimate' hidden because they were afraid people would complain that it wasn't exact.

...

 

The principle was actually patented back in 2006 so accessible to every one :)

Although it wasn't a US patent until Oct. 15. 2009

 

DIAPHRAGM VALUE RECOGNITION US 2009/0256954

 

A method for determining the current camera aperture (working aperture) of lenses on digital cameras having a viewfinder eyepiece and internal exposure measurement through the lens is wherein a further external exposure measurement is carried out past the lens and the value of the working aperture is determined from a reference table stored in the digital camera from the difference Delta BV between the two measured exposure values BV(int) and BV(ext).

 

 

I have found it to be very accurate, much better than I initially thought possible:)

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Concerning the aperture: The camera compares illumination data from the blue dot on the front of the camera to the exposure calculated by the camera's meter to come up with an estimate of the aperture. To do so, of course, the camera has to know the maximum aperture of the lens from the lens ID code. At first, Leica kept the existence of the 'guestimate' hidden because they were afraid people would complain that it wasn't exact.

 

FWIW, I just re-checked my lens' data field. It reads "Leica Elmarit-M 28mm f/2.8 (III)."

 

You do have the latest version of Aperture, right? I think at one time the program may not have retrieved all the information. But if your 35's info shows up, so should your 28's.

 

I'm sure someone is around who can point you in the right direction. I've never used any of the DIY coders.

 

You have verified your coding with Carsten's Leica M Lens Codes, right?

 

Howard:

I am using Aperture 3.1.1 and its predecessor 3.0 versions for a year and it has never identified my lenses other than showing focal length with an approximation (always off) of f stop.

Am I missing something?

Rich

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Rich, you're the expert! As I said, I've never used Aperture.

 

So you've answered the OP's question in post #3: "No." :D

 

Have you any advice for him/her since s/he's not getting estimated aperture on her/his 28? Mis-coding? Mis-reading of the code? Or any explanation of why Aperture does identify his/her 35 as a Summilux?

 

 

FWIW, Bridge shows the following:

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Simply register for free here – We are always happy to welcome new members!

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Thanks again for all the information. I am new to a rangefinder camera and I learned a lot from the postings.

 

 

This is the crop image from Aperture and as you see focal length is shown but F-stop and lens info are not. Is it what everyone is getting from the meta data in Aperture when the lens is manually coded?

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

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The lens aperture metadata is also quite confusing if you happen to be using an ND filter, as I discovered when using an ND8 filter on my 'Lux 50 - it reports apertures about 3 stops slower than the actual one.

 

Regards, Jim

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Your Aperture screen grabs are from different cameras. I think there was a change between M8 and M9 in the way data are labeled. (Sandy would know this.)

 

Could be that Aperture is reading the M9 format but not the M8 one. That would explain all the discrepancies.

 

Try the 28 on the M9 and see if the data aren't all there, and the 35 on the M8 to see if you lose data.

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I only get "Unknown Lens" with my M9 (whether using 6 bit or manually coded lenses).

Leex - how are you getting the lens info in the Metadata tab for your M9 with the 35mm Lux ASPH?

Rich

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The image from M9 with 35mm Lux ASPH is from my friend. He bought a new 35mm ASPH with 6bit factory code.

 

I thought that my 28mm lens was coded correctly even though it was shown as unknown lens because the Metadata has 28mm focal length information in it. After I got the image from my friend and compared two I was wondering if the lens was fully coded because it didn't have any lens information except focal length.

 

Oh, well, I should have bought a 6bit coded lens instead.

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You can always decide later to have it coded. I'm sure it's coded correctly, since the camera recognizes the focal length, and since your question is about the EXIF and not why you're getting vignetted images. :p

 

 

If you get a chance, you might ask your friend whether Aperture identifies all his lenses, just to satisfy the other Aperture users who aren't getting the full name identification. But that's a different topic. ;)

 

 

 

Edit: I just noticed this thread, started a year ago but still current, which might be of interest: http://www.l-camera-forum.com/leica-forum/digital-post-processing-forum/117334-aperture-3-0-1-metadata-information.html.

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