Lens profiles supporting RF lenses with Neural Network processor

[JamesHarvey]

Does anyone know if there is any specific technical reason why there are no lens profiles supporting some RF consumer lenses in the NN processor; e.g. the RF800/11?  Is that because that lens uses DO, perhaps?  Thanks!

[Stephen]

Good morning, JamesHarvey!

You'll find a lot more information over at https://canon.us/nnipt 
Under the section talking about Neural Network Lens Optimizer, you'll find a link to a 22-page white paper. I'm guessing you'll find all the technical reasons there.

I hope this helps!

[JamesHarvey]

I'll let you know!  Thanks!.
Is there a good index of Canon tech WP and briefs anywhere?  I contribute a lot of answers on the FB Canon mirrorless Forums, and like to use reference to Canon docs where possible; e.g. I have quoted the Canon EU publication on "8 stops IS" on coordinated IS a score of times when the question of using EF or RF lenses on boidies with IBIS comes up.

[JamesHarvey]

Thanks, to someone like myself who has studied DL/AI a bit, those WPs are really interesting.  I was in telecom R&D for 50 years & a lot of that time I was looking into applications of digital processing of analog information, so as I approached retirement it has been great to be able to apply that knowledge to my return to photography.  As a teen in the 60's I had my own darkroom, even up to the point of printing in color, so I really appreciate the advances that digital has enabled.  As someone who has done a lot of analogue imaging in the past, I really like Canon's approach of "keep it real", don't remove all the imperfections & don't overcorrect to the point where you can't tell the real image from a total fake.

From what I read in those papers I suspect that the issue with the RF800/11 is that the NN/AI lens correction would not add anything to the current correction used in camera & DPP,as those lenses use DO, so diffraction correction etc. is inherent in the standard processing, but it would be nice to get confirmation of that somehow.

[Stephen]

I'll see if I can get your question in front of the right people. I can't promise an answer because some things are trade secrets, so they will/can not answer if this is an "unpublished spec."

[JamesHarvey]

Well understood, thanks.  It's more a question of whether there will be profiles in the future for them, or what else can be done to achieve that degree of controlled sharpening & aberration correction, and are there other classes of lenses that might be excluded from such support in the future?  For example, it is odd that the EF600/4iii is not included, being optically identical to the RF version, though that may also be to do with not wanting to produce profiles for EF TCs, which could prove to be a slippery slope.  Pity, because I'm renting the EF in a couple of weeks time.  Maybe I just need to edit the exif data in the raw files to make it work 🙂

[Stephen · Accepted solution]

Good morning, James!

I wanted to let you know that I spoke with a few people about this. I was told that the process for deciding which lenses are included isn't published or shared with anyone that you or I have access to. I'm sorry. 😔