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Author Topic: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6  (Read 5580 times)

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Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« on: August 31, 2012, 06:15:44 AM »

More Patents

A couple of new lens formula patents which seems to address lowering chromatic aberrations in a new way


Patent Publication No. 2012-163746



  • 2012.8.30 Release Date

  • 2011.2.7 filing date


Example 4



  • Zoom ratio 4.67

  • 56.11 – - 131.85mm f = 28.21 focal length

  • Fno 4.12 -. 4.89 – 5.77

  • Half angle of view ω = 37.48 – 21.09 – 9.32deg.

  • Image height 21.64mm

  • 242.67 – - 266.43mm 224.00 overall length of the lens

  • BF 55.79 – 70.40 – 82.95mm

  • 20 sheets of 14 group lens configuration

  • Two two-sided aspherical

  • Three low-dispersion glass

  • Four Super UD glass

  • 102.40mm effective diameter of the first surface

  • 5-group zoom negative positive negative


Example 5



  • Zoom ratio 10.31

  • 93.64 – - 307.06mm f = 29.77 focal length

  • Fno 3.31 -. 4.71 – 5.85

  • Half angle of view ω = 36.00 – 13.01 – 4.03deg.

  • Image height 21.64mm

  • 263.66 – - 304.01mm 209.34 overall length of the lens

  • BF 61.72 – 89.40 – 106.84mm

  • 18 sheets 12 groups lens configuration

  • Three 3 aspherical surface

  • Three low-dispersion glass

  • 2 UD glass sheets

  • 84.36mm effective diameter of the first surface

  • 5-group zoom negative positive negative

  • In the zoom lens of the positive lead type, reducing the chromatic aberration of magnification of the secondary


Source: [EG]

cr


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Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« on: August 31, 2012, 06:15:44 AM »

Viggo

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #1 on: August 31, 2012, 06:33:38 AM »
Because they sold so many of the old 28-300?  ;D
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marekjoz

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #2 on: August 31, 2012, 07:27:11 AM »
Because they sold so many of the old 28-300?  ;D

No. Because they can :)
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nicku

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #3 on: August 31, 2012, 07:50:52 AM »
the 28-135 will finally be replaced ( maybe). I used that lens many years ago......  :D

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #4 on: August 31, 2012, 08:31:35 AM »
Because they sold so many of the old 28-300?  ;D

No. Because they can :)
+1 for marekjoz
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Rienzphotoz

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #5 on: August 31, 2012, 08:35:16 AM »
This is good news ... I wish they will start production asap ... Canon can count me in as their customer for the EF 28-300 ... it will be incredibly convenient during vacations.
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Viggo

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #6 on: August 31, 2012, 09:32:35 AM »
This is good news ... I wish they will start production asap ... Canon can count me in as their customer for the EF 28-300 ... it will be incredibly convenient during vacations.

Not if it's the L-version...
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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #6 on: August 31, 2012, 09:32:35 AM »

Rienzphotoz

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #7 on: August 31, 2012, 09:37:19 AM »
This is good news ... I wish they will start production asap ... Canon can count me in as their customer for the EF 28-300 ... it will be incredibly convenient during vacations.

Not if it's the L-version...
For me it doesn't matter if it is L or non-L ... it should not be the same weight as the current version .... if the new 28-300 (even it is an L version) is the same weight as 70-300L than it would be PERFECT.
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neuroanatomist

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #8 on: August 31, 2012, 09:42:46 AM »
This is good news ... I wish they will start production asap ... Canon can count me in as their customer for the EF 28-300 ... it will be incredibly convenient during vacations.
Not if it's the L-version...

There's a non-L 28-300mm from Canon?  I haven't seen one...  You may be thinking of the old 28-200mm.

FWIW, I use my 28-300L for travel, and it is very convenient.  Is it big and heavy?  Yes.  But it's no heavier than the two-lens setup it replaces (24-105 + 70-300L), and means no lens changes required.

the 28-135 will finally be replaced ( maybe). I used that lens many years ago......  :D

For many years, the 28-135mm was the kit lens for the lower end of the lineup, film cameras, that is.  Seems like a refreshed 28-135mm would be a good kit lens for an entry-level FF dSLR...
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simonxu11

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #9 on: August 31, 2012, 09:49:30 AM »
This is good news ... I wish they will start production asap ... Canon can count me in as their customer for the EF 28-300 ... it will be incredibly convenient during vacations.
Not if it's the L-version...

There's a non-L 28-300mm from Canon?  I haven't seen one...  You may be thinking of the old 28-200mm.

FWIW, I use my 28-300L for travel, and it is very convenient.  Is it big and heavy?  Yes.  But it's no heavier than the two-lens setup it replaces (24-105 + 70-300L), and means no lens changes required.

the 28-135 will finally be replaced ( maybe). I used that lens many years ago......  :D

For many years, the 28-135mm was the kit lens for the lower end of the lineup, film cameras, that is.  Seems like a refreshed 28-135mm would be a good kit lens for an entry-level FF dSLR...

I was thinking the same thing, just hope they annouce the entry FF in September

WoodyWindy

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #10 on: August 31, 2012, 01:15:28 PM »
Actually, the 28-135 IS was introduced with the much-adored EOS 3, and was considered a premium (though non-L) optic for a long time before it became the big-box store kit lens with the x0D series.

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #11 on: August 31, 2012, 01:17:34 PM »
The 28-135mm is overdue for an update. Perhaps a new Kit lens for the Budget FF body to come? 8)

paulc

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #12 on: August 31, 2012, 03:27:15 PM »
Is anybody else afraid of what the new 28-135 is going to cost with that parts list?  I'm thinking that can't possibly be the new kit lens, too expensive.

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #12 on: August 31, 2012, 03:27:15 PM »

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #13 on: August 31, 2012, 03:46:23 PM »
Is anybody else afraid of what the new 28-135 is going to cost with that parts list?  I'm thinking that can't possibly be the new kit lens, too expensive.
Not really coz I would never buy such a relatively limited zoom range (28-135) with variable aperture ... besides I like my 24-105 f/4 L IS way too much to go the 28-135 way. But EF 28-300 would be incredibly convenient even it is a variable aperture zoom lens ... I would like it even more if it was an L lens but with the same size and weight of 70-300L ... all wishful thinking at this moment  ;D
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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #14 on: September 02, 2012, 01:28:05 AM »
Is anybody else afraid of what the new 28-135 is going to cost with that parts list?  I'm thinking that can't possibly be the new kit lens, too expensive.

Hopefully if there is an increase in price then there is at least a commensurate increase in IQ.

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Re: Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6
« Reply #14 on: September 02, 2012, 01:28:05 AM »