Patent: Canon appears to be continuing development of EF mount optical formulas

Canon Rumors Guy

EOS 1D MK II
Jul 20, 2010
7,753
387
Canada
www.canonrumors.com
A patent showing continued development in EF mount optical formulas has appeared at the Japan Patent Office this past week.
This patent covers two optical formulas, one being an EF 20mm f/1.4 and the other being an EF 12-24mm f/4.5-5.6.
I don’t feel either of these optical formulas will become new products and this is more about the development of lens technologies than the optical formulas themselves.
Canon EF 20mm f/1.4

Focal length: 20.50mm
FNo: 1.44
Image height: 21.64mm
Lens length: 134.70mm
Back focus: 36.81mm

Canon EF 12-24mm f/4.5-5.6

Focal length: 12.40-18.00-23.64mm
FNo: 4.35-4.96-5.60
Image height: 21.64mm
Lens length: 142.18-132.82-131.14mm
Back focus: 36.14-44.23 -52.29mm
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neuroanatomist

I post too Much on Here!!
Jul 21, 2010
24,619
2,105
How is this possible? 'Forum wisdom' is that EF is dead. :rolleyes:

I wouldn't mind a 20/1.4, but probably only if Canon finally decides to address coma and astigmatism in their lens designs (something they have a history of ignoring). With those aberrations well controlled, a 20/1.4 would be an amazing astro lens.
 

Don Haines

Beware of cats with laser eyes!
Jun 4, 2012
8,190
1,769
Canada
I already have a 20F1.4, it’s a great lens for night skies, but yeah, I can see it being a fairly limited market.

Now a new 12-24 F4-5.6? I can see that one selling fairly well.
 

Cryhavoc

Eos R, EM1 Mk1, EM1 MkII, EM5 MkII
Jan 17, 2019
60
62
Seattle
Sigma's 20mm f1.4 Art is a fantastic lens at $899.
Sure it has Coma issues at the edges, but a lens that controls/eliminates both coma and astigmatism would be fantastically expensive no?
 

canonnews

EOS RP
Dec 27, 2017
347
298
Canada
www.canonnews.com
we posted about this one yesterday, it's a bit of an odd patent application, because the backfocus distance is showing an ingress into the EF mount, which would normally hit the mirror.
 

Antono Refa

EOS 6D MK II
Mar 26, 2014
867
135
I wouldn't fall out of my chair if Canon released an EF 20mm f/1.4L USM, as

* Sigma makes one, which seems to sell well. Nikon released a 20mm f/1.8 ~5 years ago as well.

* The amateur market is shrinking, but there's still money in pro equipment.

* Canon has improved it's ultra wide lenses in the past few years.

* The 20mm & 135mm are the only primes not to get a new lens this millennium.

* The 20mm f/2.8 has poor IQ, and is older than the 135mm f/2.0L.

* Releasing a 20mm f/1.4L would be a great way to show the EF line isn't dead.
 

padam

EOS 7D MK II
Aug 26, 2015
607
220
They have the CN-E 20mm T1.5 available for a while, so might as well do a stills version, too.
 
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Mort

EOS M50
Jun 28, 2013
25
7
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I wouldn't mind a 20/1.4, but probably only if Canon finally decides to address coma and astigmatism in their lens designs (something they have a history of ignoring). With those aberrations well controlled, a 20/1.4 would be an amazing astro lens.
My 35 1.4 II handes coma just fine. So if they did update this lens, I'm sure it would be addressed. I'd love to seem them do a lens like this. I see that Sony 24 1.4 (super sharp, bright, AND small) and get really gear envious for any who own it...
 
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Normalnorm

EOS 7D MK II
Dec 25, 2012
538
142
* The amateur market is shrinking, but there's still money in pro equipment.
The market is shrinking but the money is still in premium lenses that are bought by the amateur market which has always been the largest sector of purchasers. Just like Porsches are bought by old men and not racers. ;)
 
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Ale_F

6D - 7D
Nov 22, 2018
45
32
They are not pure EF, but CN for the "short" BF.
oops there are also a 21 F2 and 21 F 1.8
 

unfocused

EOS 1D MK II
Jul 20, 2010
5,049
1,431
66
Springfield, IL
www.mgordoncommunications.com
Why does no one want to assume that the EF mount can be saved for MILC cameras?
Well, it wouldn't make much sense to keep making lenses in one mount, if all the cameras were in a different mount.

But, I don't buy the inevitability of DSLRs disappearing. From today's vantage point, both form factors have their own advantages and disadvantages. Mirrorless may eventually do everything as well or better than DSLRs, but I don't think that can be known for certain today.
 

SecureGSM

2 x 5D IV
Feb 26, 2017
1,356
330
Sigma's 20mm f1.4 Art is a fantastic lens at $899.
Sure it has Coma issues at the edges, but a lens that controls/eliminates both coma and astigmatism would be fantastically expensive no?
Not so much fantastic as it suffers from a strong focus shift. Stop it down and your focus is shifted behind your subject. Sigma 12-24/4 is the same. Not sure about the 14-24/2.8 lens though.
 

3kramd5

EOS 5D MK IV
Mar 2, 2012
3,083
404
Well, it wouldn't make much sense to keep making lenses in one mount, if all the cameras were in a different mount.

But, I don't buy the inevitability of DSLRs disappearing. From today's vantage point, both form factors have their own advantages and disadvantages. Mirrorless may eventually do everything as well or better than DSLRs, but I don't think that can be known for certain today.
I believe it’s a certainty that SLR will always outperform mirrorless in two areas:
1. Power consumption, all else being equal;
2. Not requiring an illuminated screen for TTL composing.
 

mb66energy

EOS 6D MK II
Dec 18, 2011
1,299
206
Germany
www.MichaelBockhorst.de
Maybe EF will stay alive because not everyone wants mirrorless cameras, I for one will stay with my 1 Series cameras.
My experience is that I wanted to stay with such a lot things but (1) they weren't available after a certain point of time and (2) they have been replaced by better solutions, while I myself needed some time to be convinced by the facts.

At the moment series 1 cameras are not assimilated by the EOS R series, just not the 5D series at least the 5Ds models. But bodies go, lenses stay. And the next wave of EOS R cameras will be close to the 1D and 5D series - not because Canon wants to replace the DSLR models but because they have strong competition from Sony and Nikon. Maybe these cameras are essentially not better but if they are more attractive compared to Canon cameras Canon has to do something to support its camera sector.

In my - much lower end - case I was absolutely surprised how much better the M50 suits my style of photography compared to 40D, 5D mark i, 200D . I never believed that I would like such a thing better than DSLRs - I bought it primarily to make some "functional" video (for physics and math lessons) with an electronic viewfinder which works much better in bright light / with telephoto lenses. But it also worked better in photography (especially precise AF for slow moving subjects, no potential eye damage in contralight scenarios) for me. Finally I am convinced by the mirrorless concept despite the fact I like my 100 year old manually operated coffee grinder much more than the electric version ! :)