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juliep

AP Beta 1.8.0.486 lens profile missing

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Hi,

Am using AP Beta 1.8.0.486 & found James' great video on adding in lens profiles.

I followed it to add in my Sigma 18-300mm lens which was included in the profile.

However, when opening a RAW file, there is no lens profile.

Here's a screenshot showing the inclusion of the profile file, the lens itself & lens profile distortion box revealing none.

Any ideas as to what I need to do?

Thanks so much,

Julie.image.thumb.png.39e549cfb49a873293d28927de7b4503.png

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Thanks Laurentia for trying to help me out.

I got the version of lensfun you quote & yes, the lens is in there.

I now have this version & AF still says there's no lens profile???????????

(I also shoot with a pretty standard Canon wide angle lens which is recognised by AP).

I am confused????

Julie :-)

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Hi Julie,
there must be a difference between the name of the lens in the exifs and in the lensfun file ...
Can you give me a link to a raw so that I can see what is possible to do?

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Hi Julie,

Unfortunately, I do not have good news for you ...
I tried with your photo without result. Then I tried to reproduce the issue with one of my lenses that does not appear in the lensfun database, a Nikkor 28-105 AFD zoom. I get exactly the same problem as you (with darktable using the same lensfun file, I could recognize it)!
I deduce that this procedure is inoperative on Windows, the video being made with Mac OS.
At this point, only a developer can trace the problem.
It should also be known that the maintainer of the lensfun base has big problems of disponibility and because of this, lensfun is updated with big delays and the procedure is quite forbidding. 
In addition, in lensfun, your Sigma lens has been tested with a Sony and not a Canon. The APSC crop factor for Canon is 1.6 while it is 1.5 for other brands. As a result, the distortion values would be a bit distorted. There is also a conflict in your image at the level of the exifs and the maker notes, in these last appears the zoom 75-300 Canon while it is the Sigma which appears in the exifs ...
Sorry for not being able to help you ... the hand is to the developers.

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Thanks so much Laurentia, you've been wonderful. Unfortunately I still have the problem.

Will the developers see this & take note or do I need to let them know?

Thanks again,

Julie.

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Quote

 Unfortunately I still have the problem.

Hi Julie, I'm well aware ...
Usually developers read the topics, but if you have a direct way to let them know, don't hesitate.

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Hi juliep,

I'm currently investigating this. I don't have much to tell you at the moment I'm afraid but once I know more I'll report back. Sorry about the radio silence from us.

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That's wonderful news Chris, thanks :-)

Let me know if there's any information I can help with.

The lens has been around for quite a while so had assumed it would have been picked up by v1.7 but seems it relates to Lensfun more than AF?

Thanks

Julie. 

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Hey Julie,

It looks like the slr-sigma.xml file doesn't contain the exact lens you're using. 

The xml file contains:
Sigma DT 18-300mm f/3.5-6.3 DC Macro but not Sigma DT 18-300mm f/3.5-6.3 DC Macro OS HS so you could fudge the XML and add the OS HS at the end and it should work. Alternatively, keep your eye out for the next Photo beta because you should be able to select the 'close enough' profile which would be the Sigma DT 18-300mm f/3.5-6.3 DC Macro. I'm told this is a new feature in the next beta.

1 hour ago, juliep said:

but seems it relates to Lensfun more than AF?

It would seem so! We will still be looking into it though. 

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1 hour ago, Chris B said:

Hey Julie,

It looks like the slr-sigma.xml file doesn't contain the exact lens you're using. 

The xml file contains:
Sigma DT 18-300mm f/3.5-6.3 DC Macro but not Sigma DT 18-300mm f/3.5-6.3 DC Macro OS HS so you could fudge the XML and add the OS HS at the end and it should work.

Hi Chris B,
unfortunately, it does not work. I tried this including with the exact syntax that appears in the exifs ie the original HSM termination and several other combinaisons. In any case it did not work and it seems that there is a problem with the procedure under Windows.
This is good news if the next beta improves this.

 

lensfun-2.jpg

lensfun-3.jpg

Canon-sigma-1.jpg

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12 minutes ago, laurentia said:

This is good news if the next beta improves this.

 

It would be preferable to wait for this. There are some brilliant improvements coming to this area of the app. I'd be interested to hear your feedback once it is available. 

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In addition, in lensfun, your Sigma lens has been tested with a Sony and not a Canon. The APSC crop factor for Canon is 1.6 while it is 1.5 for other brands. As a result, the distortion values would be a bit distorted

Just wanted to add, we actually compensate for this when the two crop factors differ.

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On 11/1/2019 at 4:14 PM, Tom Lachecki said:

Just wanted to add, we actually compensate for this when the two crop factors differ.

Hi Tom,

it's true when the distortion is linear all over the field, but some lenses are known for their distortion in mustache (especially wide angle) and in this case it does not work very well.

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