December 15, 2017, 06:51:27 PM

Author Topic: Patent: Canon EF-M 15-45mm f/1.8-3.5  (Read 3795 times)

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Patent: Canon EF-M 15-45mm f/1.8-3.5
« on: November 18, 2017, 08:53:28 AM »
A patent showing a faster version of the EF-M 15-45mm has appeared in the form of three separate optical formulas.

  • EF-M 15-45mm f/1.8-3.5
  • EF-M 15-45mm f/2.0-4.0
  • EF-M 15-45mm f/2.8-5.0

Canon News Summarizes:

It also looks like it may be the first canon lens patent application that I’ve seen that specifically mentions that distortion abberation control happens in camera versus being controlled by the lens.

This would tend to make more of a compact camera approach as the powershots do this already, however Canon M’s do not.

As with all patent applications that we show, this is a patent application.  This illustrates to us what Canon is looking at in their research labs.  It may or may not become a patent, and may or may not even after that be used in a camera system.

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Patent: Canon EF-M 15-45mm f/1.8-3.5
« on: November 18, 2017, 08:53:28 AM »

brad-man

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #1 on: November 18, 2017, 09:07:09 AM »
I would like a constant aperture zoom, but this is a pleasant tease...

ritholtz

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #2 on: November 18, 2017, 10:00:24 AM »
I would like a constant aperture zoom, but this is a pleasant tease...
I am going to wait until Canon releases this lens to switch it to M series.  Common walk around lens similar to 17-50mm f/2.8  with IS is very important. That is exactly what Sony is missing all these years.
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rrcphoto

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #3 on: November 18, 2017, 10:13:34 AM »
I would like a constant aperture zoom, but this is a pleasant tease...

it is!

I am wondering if canon has set it's own design limits with EF-M lenses.  it seems to me very interesting that every single lens, regardless of focal, etc is exactly 61mm in diameter within .1mm.


brad-man

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #4 on: November 18, 2017, 10:47:12 AM »
I would like a constant aperture zoom, but this is a pleasant tease...

it is!

I am wondering if canon has set it's own design limits with EF-M lenses.  it seems to me very interesting that every single lens, regardless of focal, etc is exactly 61mm in diameter within .1mm.

The 61mm "limit" probably has to do with manufacturing economics. Since all M lenses so far (other than the pancake) have been f/3.5 and slower, these new len(s) will break new ground (if they materialize). I doubt an f/1.8 zoom could exist in a 61mm housing. The nifty 50 is around 67mm wide and it don't zoom. But then again, it is full frame...
« Last Edit: November 18, 2017, 10:53:04 AM by brad-man »

Chaitanya

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #5 on: November 18, 2017, 01:02:16 PM »
Finally EF-M might be getting some good zoom lenses.

Antono Refa

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #6 on: November 18, 2017, 01:24:41 PM »
What's with group G? Are there really two flat elements, one of them right on the image plane?

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #6 on: November 18, 2017, 01:24:41 PM »

neuroanatomist

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #7 on: November 18, 2017, 01:26:40 PM »
Finally EF-M might be getting some good zoom lenses.

The M11-22 is very good, better than the EF-S UWA zooms.  But I'd certainly be interested in this as a walk around lens.
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JohanCruyff

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #8 on: November 18, 2017, 01:28:43 PM »
It seems that Fujio Mitarai has been informed that I bought a Canon EOS M6 last thursday!  ;D
Thank you Fujio!
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woodman411

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #9 on: November 18, 2017, 01:53:21 PM »
I hope this materializes. The current efm 18-55 and 15-45 are underwhelming. To be fair, their market value is less than $150 US, so they are budget class. Would love to see a mid-to-high range zoom in efm-like size, would probably be about 400-500 US dollars if this goes through.

AvTvM

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #10 on: November 18, 2017, 03:08:23 PM »
not interested in any of the those variable aperture versions. Would prefer a 15-45/2.8 CONSTANT aperture. or even a 15-45/3.5 constant aperture.

okaro

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #11 on: November 18, 2017, 04:45:41 PM »
not interested in any of the those variable aperture versions. Would prefer a 15-45/2.8 CONSTANT aperture. or even a 15-45/3.5 constant aperture.

I do not get why constant aperture should be relevant. Sure having a fast lens is better than just having a constant aperture.

Will they provide software update for cameras to handle the correction? For which models?
« Last Edit: November 19, 2017, 05:53:38 AM by okaro »

Random Orbits

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #12 on: November 18, 2017, 10:07:29 PM »
not interested in any of the those variable aperture versions. Would prefer a 15-45/2.8 CONSTANT aperture. or even a 15-45/3.5 constant aperture.

Set the aperture to of the 15-45 f/1.8-3.5 to f/3.5 and done!  Constant aperture ratio!

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #12 on: November 18, 2017, 10:07:29 PM »

rrcphoto

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #13 on: November 19, 2017, 08:35:39 AM »
Finally EF-M might be getting some good zoom lenses.

The Canon EF-M zooms already there sans 15-45 are already good.

outside of speed, the 11-22 and, 55-200, 18-150 are very good.  18-55 as well if you get a good copy.





BillB

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #14 on: November 19, 2017, 08:50:16 AM »
not interested in any of the those variable aperture versions. Would prefer a 15-45/2.8 CONSTANT aperture. or even a 15-45/3.5 constant aperture.

The aging EF-S 17-55 is an example of a constant F2.8 designed for crop coverage and it is not small light or low cost.  If you are willing to use it with an adapter, you can put it on your M whenever you want. 😋

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Re: Patent: Canon EF-M 15-45mm f/1.8-3.5
« Reply #14 on: November 19, 2017, 08:50:16 AM »