Patent: Canon presents some interesting fast zoom lens optical formulas

navastronia

EOS RP + 5D Classic
Aug 31, 2018
801
990

Canon 21-80 f/1.5​

One lens to rule them all, one lens to find them, one lens to bring them all, and in the darkness bind them!

EDIT: not gonna lie, I would pay 4K for this if it included a zoom lock switch
 

cpreston

EOS 90D
Mar 22, 2014
132
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Those maximum apertures stops sound more like Cinema lenses then still lenses. Still lenses (rarely) deviate from the typical numbers 1.2, 1.4, 1.8, 2, 2.8 etc… but I’ve noticed cinema lens often end in odd numbers in the decimal.
I would also guess this would be expensive cinema glass. The reason that the T numbers are odd on Canon glass, though, is because they are just taking the even focal length number and adding 0.1. I don't think many companies even measure the transmission, they just add 0.1 since the transmission will never be 100% of the theoretical f stop number. An f/1.5 would likely be a T1.6.
 

Nemorino

EOS R5
Aug 29, 2020
423
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Those maximum apertures stops sound more like Cinema lenses then still lenses. Still lenses (rarely) deviate from the typical numbers 1.2, 1.4, 1.8, 2, 2.8 etc…
If you have a look at other lens patents, you will see a lot strange aperture numbers like 2.9 or 4.1 etc in the specs. The marketing division will sell them as 2.8 or 4.
For example

And of cause the 300mm ist a 292.53mm in the specs. ;)
 
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EOS 4 Life

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Those maximum apertures stops sound more like Cinema lenses then still lenses. Still lenses (rarely) deviate from the typical numbers 1.2, 1.4, 1.8, 2, 2.8 etc… but I’ve noticed cinema lens often end in odd numbers in the decimal.
Cinema lenses usually go by T Stop.
For Canon, F Stops are usually even so when they have cine versions of photo lenses those ten to have off F stop numbers.
Like 50 f/1.2 and 50 T1.3 being different versions of the same lens.
Canon has dedicated cinema lenses with both odd and even F stops.
An F stop of 1.5 will probably be a T stop of 1.6 or so.
For comparison, those Sigma f/1.8 zooms have a T stop of 2.
 
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SnowMiku

EOS RP
Oct 4, 2020
203
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If my 2008 self saw those two 1kg lenses as an alternative over a 4.5kg EF 800mm & 5.4kg EF 600mm then odds are I'd get the f/11 copies as I am lazy in carrying things and the risk of being hassled over the gear is reduced to near nil.

I've even had people comment about my gear when I use a 700D and 55-250mm thinking it's professional gear. But when I use the M5 and 18-150mm no one cares. You will still get people approaching you with the RF 600mm and 800mm, but not as much as the big whites.
 
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dolina

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I've even had people comment about my gear when I use a 700D and 55-250mm thinking it's professional gear. But when I use the M5 and 18-150mm no one cares. You will still get people approaching you with the RF 600mm and 800mm, but not as much as the big whites.
That has been my experience as well. You're more likely to see a Ferrari or McLaren than fast white primes.

This will only entificy as fewer and fewer people buy dedicated still cameras into the future.
 
Aug 7, 2018
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As it is Canon, they will likely print "f/1.4" on those f/1.5 lenses. Sadly Canon cheats a little when it comes to specs. A 600mm lens is only 585mm and so on. I wish there were laws that require companies to fulfil at least the promised specs. It seems a few percent of cheating is legal and they alway try to use those few percent to their advantage.

I wish the industry would also switch to T-stops instead of F-stops like it is already done for professional video lenses. There are huge differences between the same F-stops of two different lenses. Only with T-stops the amount of light would always be the same.
 
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koenkooi

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Feb 25, 2015
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As it is Canon, they will likely print "f/1.4" on those f/1.5 lenses. Sadly Canon cheats a little when it comes to specs. A 600mm lens is only 585mm and so on. I wish there were laws that require companies to fulfil at least the promised specs. It seems a few percent of cheating is legal and they alway try to use those few percent to their advantage.

I wish the industry would also switch to T-stops instead of F-stops like it is already done for professional video lenses. There are huge differences between the same F-stops of two different lenses. Only with T-stops the amount of light would always be the same.
For prepackaged things we have https://en.wikipedia.org/wiki/Estimated_sign over here in Europe. Nothing is absolute, but it'd be nice to have guidelines on how much leeway there is on specs :)
 
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neuroanatomist

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Jul 21, 2010
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As it is Canon, they will likely print "f/1.4" on those f/1.5 lenses. Sadly Canon cheats a little when it comes to specs. A 600mm lens is only 585mm and so on.
Your implication seems to be that when Nikon or Sony put out an f/1.4 or 600mm lens, it’s actually f/1.4 or 600mm and not something slower or shorter that’s rounded to the specified value. Do you believe that’s true?
 
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Aug 7, 2018
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No, I do not think that the others cheat less, but I only have Canon gear and it annoys me when a really expensive lens cheats.
 

peters

EOS RP
Dec 25, 2017
538
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This would be epic!

Canon 21-80 f/1.5​

Would be a total nobrainer and a goto lense for any event or wedding photographer. I doubt that this is realistic on fullframe though...
 

AlanF

Stay at home
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Aug 16, 2012
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Your implication seems to be that when Nikon or Sony put out an f/1.4 or 600mm lens, it’s actually f/1.4 or 600mm and not something slower or shorter that’s rounded to the specified value. Do you believe that’s true?
The patent for the RF 300mm f/2.8 has it as 292.53mm f/2.9. Are you still going to pre-order?
 
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neuroanatomist

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The patent for the RF 300mm f/2.8 has it as 292.53mm f/2.9. Are you still going to pre-order?
Not anymore. That sort of behavior is unacceptable for a manufacturer and I'm going to stick it to Canon by not buying their game or their lens.
 
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EOS 4 Life

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Sep 20, 2020
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This would be epic!

Canon 21-80 f/1.5​

Would be a total nobrainer and a goto lense for any event or wedding photographer. I doubt that this is realistic on fullframe though...
18-45 and 40-100 seem like a more likely combination.
These lenses would also probably be very expensive.
 

BakaBokeh

EOS RP
CR Pro
May 16, 2020
217
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21-80 f/1.5 is the bombshell that just walked in the room, and everyone's jaw just dropped

if it's FF, and 28-70 f2 is any indication, this is gonna be a thicc lens!