December 22, 2014, 11:02:58 PM

Author Topic: Patent: EF 16-35 f/4L, 17-40 f/4L and Others  (Read 5982 times)

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Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« on: March 10, 2014, 07:30:15 AM »
A slew of patents showing various wide angle optical formulas has appeared. All of the lenses appear to be for full frame and could be hints of replacements for the EF 17-40 f/4L as well as the EF 16-35 f/2.8L II.

  • Patent Publication No. 2014-41245
    • Publication date 2014.3.6
    • Filing date 2012.8.22
  • Example 1
    • Focal length f = 16.49-23.55-33.95mm
    • Fno. 4.10
    • Half angle ω = 52.68-42.57-32.51 °
    • 14 pieces of 10-group lens configuration
  • Example 2
    • Focal length f = 17.50-25.45-38.90mm
    • Fno. 4.10
    • Half angle ω = 51.03-40.36-29.08 °
    • 15 pieces of 11-group lens configuration
  • Example 4
    • Focal length f = 17.50-24.82-38.89mm
    • Fno. 2.88-3.25-4.10
    • Half angle ω = 51.02-41.08-29.09 °
    • 15 pieces of 11-group lens configuration
  • Example 5
    • Focal length f = 16.50-25.34-34.00mm
    • Fno. 2.91
    • Half angle ω = 52.66-40.49-32.47 °
    • 15 pieces of 11-group lens configuration
  • Canon patents
    • 4-group zoom of positive and negative positive negative
    • Inner focus

Source: [EG]

Canon EF 17-40 f/4L | Canon EF 16-35 f/2.8L II

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Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« on: March 10, 2014, 07:30:15 AM »

Woody

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #1 on: March 10, 2014, 09:01:56 AM »
I like the idea of having a 17-40 f/2.8-4 as long as it's sharp from corner to corner and maintains the current lens weight. :)

wjm

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #2 on: March 10, 2014, 09:58:08 AM »
I'd really hoped for the 16-50/4 IS ...  :(

Would be nice on my APS-C (=25-80 (eqv) 'standard' lens) and my full frame (=wide angle). Would probably be an instant buy ...
« Last Edit: March 10, 2014, 10:00:20 AM by wjm »

tron

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #3 on: March 10, 2014, 10:04:37 AM »
Let's not forget the obvious too: 16-35 f/2.8L III

wjm

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #4 on: March 10, 2014, 10:06:33 AM »
I like the idea of having a 17-40 f/2.8-4 as long as it's sharp from corner to corner and maintains the current lens weight. :)

And half the price?  ;)

tron

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #5 on: March 10, 2014, 10:08:24 AM »
I like the idea of having a 17-40 f/2.8-4 as long as it's sharp from corner to corner and maintains the current lens weight. :)

And half the price?  ;)
;D  Not so Canon ...  ;D

Pixel

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #6 on: March 10, 2014, 10:11:03 AM »
Just give me a sharp, low distortion wide angle. That's all I ask for.

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #6 on: March 10, 2014, 10:11:03 AM »

Albi86

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #7 on: March 10, 2014, 10:22:21 AM »
A refresh is needed since both have pretty soft corners - which is usually an undesired feature in WA or UWA lens.

In fact a corner-to-corner sharp 16-35/2.8 would replace the need for a Nikon-like 14-24mm that Canon users sometimes feel the need for.

tron

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #8 on: March 10, 2014, 10:26:50 AM »
A refresh is needed since both have pretty soft corners - which is usually an undesired feature in WA or UWA lens.

In fact a corner-to-corner sharp 16-35/2.8 would replace the need for a Nikon-like 14-24mm that Canon users sometimes feel the need for.
+1 EXACTLY!

Caps18

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #9 on: March 10, 2014, 10:31:13 AM »
Is size, cost, and weight the reasons someone would go with a 16-35 f/4 over the 16-35 f/2.8?

I like my 16-35mm f/2.8 a lot and haven't noticed any problems with it.
5D mark 2, 16-35mm f/2.8, 17mm TS-E f/4, 85mm f/1.8, 300mm f/4 + 1.4x, 580 EX Flash

tron

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #10 on: March 10, 2014, 10:33:24 AM »
Is size, cost, and weight the reasons someone would go with a 16-35 f/4 over the 16-35 f/2.8?

I like my 16-35mm f/2.8 a lot and haven't noticed any problems with it.
Do you use it for astrophotography fully open?

Woody

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #11 on: March 10, 2014, 11:01:44 AM »
I'd really hoped for the 16-50/4 IS ...  :(

I will love to have a 16-50 f/4 IS too. But I don't think that's coming. It is probably a figment of someone's imagination. Sigh

Mantanuska

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #12 on: March 10, 2014, 11:08:09 AM »
The 17-40 definitely needs an upgrade. The Tamron 10-24 I had for apsC was sharper than my 17-40 on FF.

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #12 on: March 10, 2014, 11:08:09 AM »

GMCPhotographics

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #13 on: March 10, 2014, 11:22:11 AM »
The 17-40 definitely needs an upgrade. The Tamron 10-24 I had for apsC was sharper than my 17-40 on FF.

You are comparing two different lenses on two different formats. It's not a reasonable comparison.
Yes, there's room for an update. But it's not a critical update. The current 17-40L and 16-35IIL are both very strong and capable performers.

pedro

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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #14 on: March 10, 2014, 11:24:03 AM »
Maybe the appearance of a 16-35 F/4 patent is a hint for a later 12-24 F/2.8 which would complement and complete the 24-70, 70-200 line up. Hope they'll go for it.
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Re: Patent: EF 16-35 f/4L, 17-40 f/4L and Others
« Reply #14 on: March 10, 2014, 11:24:03 AM »