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    Canon Patent Application: Small Full Frame RF Primes

    By 4 Comments1 Min Read Canon Patents
    JPA 505183153 i 000002 1536x518 - Canon Patent Application: Small Full Frame RF Primes

    In this patent application, Canon is illustrating some smaller primes. Since these designs are relatively simplistic, they could be good “bang for the buck” lenses as long as you are not expecting pristine resolving power, as they don't optically fill the entire image circle but rely on software stretching.

    Canon's entire purpose with this patent application is to create small primes. Something I'm sure we can all get behind. The lenses are around 50mm long, making them quite compact for F2.8 primes.

    Canon RF 15mm F2.8

    Focal length                 15.42  
F number                      2.91  
Half angle of view (degrees) 49.73  
Image height                 18.20  
Lens total length            69.48  
BF                           15.51

    Canon RF 18mm F2.8

    Focal length                 18.20  
F number                      2.91  
Half angle of view (degrees) 47.70 
Image height                 20.00  
Lens total length            68.27  
BF                           16.21  

    Canon RF 19mm F2.8

    Focal length                 19.10   
F number                      2.91   
Half angle of view (degrees) 43.62 
Image height                 18.20 
Lens total length            69.24
BF                           13.36 

    As with all patent applications, none of these may become actual products, but it's a glance into the research happening at Canon.

    Source: Japan Patent Office 2023-183153

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    4 comments

    1. Being that this is Canon is a high chance that at least one of these are going to come out. Software stretching? Plastic lenses and now software stretching... wow. Canon 2024 lets go!
    2. Being that this is Canon is a high chance that at least one of these are going to come out. Software stretching? Plastic lenses and now software stretching... wow. Canon 2024 lets go!
      I was skeptical about the PMO used for the RF28mm, but it is a very sharp lens, that I find very fun to use.
      Similar thing for the stretching needed on the RF16mm, its corners at f/2.8 are sharper than my 17-40 F/4L.

      So far I have no complaints about the stretching or PMO, which I expected to have before using the lenses. I bought them mainly for their size and weight, the image quality has been surprisingly OK.

      Let’s see what real world results the 2024 stretchy plastic lenses achieve before a priori pooh-poohing them. I bet the RF-S lenses will likely be very underwhelming, while the RF ones will perform as promised. Canon likes to annoy people that refuse to use RF lenses on APS-C cameras that way.
    3. The designs are \"Simple\" not \"Simplistic\". Simplistic means overly-simplified to the point of inaccuracy.
      Would be great if Canon follows through with small, lightweight primes. I think that there is a broad market for such lenses. I know that if the optical quality is good, they will be attractive to me.

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