Lens aperture patent

parsons · 07-19-2012, 01:57 AM - **1 Like**

RiceHigh's Pentax Blog: New Pentax Circular Lens Aperture Patent

don't know why nobody thought of this before

Docrwm · 07-19-2012, 04:06 AM

Looks interesting, I wonder if its going to be rolled out any time soon in a lens?

Self-interpretation and summary, Patent Document

Patent Publication No. 2012-123299

2012.6.28 Release Date
2010.12.10 filing date

Traditional circular aperture

Become circular aperture diameter in the specific
In other aperture diameter can not be the circular

Bokeh

Beautifully composed close to the circular aperture
Non-circular flare from, circular flare is more beautiful

Large number of aperture blades

Be close to the number of large and round
Overlapping wings, slow down
Paint fell, internal reflection occurs

Pentax patent

The shape of the aperture having a plurality of pairs of different edge
Depending on the aperture value, use the optimal set
Close to the circular aperture in which

Vasyl · 07-19-2012, 07:29 AM

It looks similar to old Yashinon DX 45mm F1.4...but there are 6 blades...

wlachan · 07-19-2012, 10:03 AM

My concern is that if they had trouble aligning 8-9 blades with existing lenses, what will misaligned 14 blades look like? Will they cancel out each other somehow? Will Ricoh tighten up QC enough to make it work (on most production samples)?

RXrenesis8 · 07-19-2012, 02:20 PM

Originally posted by wlachan

My concern is that if they had trouble aligning 8-9 blades with existing lenses, what will misaligned 14 blades look like?

Looks like one set will be used for some apertures, and the other set will be used for the rest. ex: one set goes from 1.4-5.6, and the second set goes from 5.6-22

Na Horuk · 07-21-2012, 09:39 AM

Looks interesting, but how does this keep cost down? Compared to having, for example, 10 rounded blades? Isn't 7x2 in two modules more parts and more complicated than simply having a few more blades?

Mehlsack · 07-21-2012, 10:03 AM - **1 Like**

yep it is and it is even more likely to fail..... so i think we will see it in new DA* Lenses

Na Horuk · 07-21-2012, 10:15 AM

Originally posted by Mehlsack

yep it is and it is even more likely to fail..... so i think we will see it in new DA* Lenses

LOL good observation

Kunzite · 07-21-2012, 10:26 AM

It seems to me this would be easier to align/make/whatever and more reliable than a "normal" 14 blades aperture (this is the point of the patent, right?).
Which means it won't be used in the DA*s

Clavius · 07-21-2012, 10:55 AM

Pretty brilliant. Why wasn't it done before?

Docrwm · 07-21-2012, 10:59 AM

Originally posted by Clavius

Pretty brilliant. Why wasn't it done before?

Engineers are conservative by nature would be my guess.

MysteryOnion · 07-21-2012, 11:54 AM

It looks like the design may give a shorter response time. Is this a bit to make a non-retrofocus design?

Arthur Dent · 07-21-2012, 12:07 PM

I have an old 12mm fisheye lens that only has f/8, 11, and 16 openings that are round holes in a flat disk that are moved into the light path as you turn the aperture ring. Those are truly round, not polygonal approximations

Mehlsack · 07-21-2012, 12:31 PM

Sorry, i am realy thinking about that and i dont see any advantage against "normal" 14 blades :S

Docrwm · 07-21-2012, 12:38 PM

Originally posted by Mehlsack

Sorry, i am realy thinking about that and i dont see any advantage against "normal" 14 blades :S

Fewer moving parts?

07-19-2012, 01:57 AM - 1 Like	#1
parsons Inactive Account Join Date: Apr 2010 Location: ENGLAND Posts: 389	Lens aperture patent RiceHigh's Pentax Blog: New Pentax Circular Lens Aperture Patent don't know why nobody thought of this before

07-19-2012, 04:06 AM	#2
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Looks interesting, I wonder if its going to be rolled out any time soon in a lens? Self-interpretation and summary, Patent Document Patent Publication No. 2012-123299 2012.6.28 Release Date 2010.12.10 filing date Traditional circular aperture Become circular aperture diameter in the specific In other aperture diameter can not be the circular Bokeh Beautifully composed close to the circular aperture Non-circular flare from, circular flare is more beautiful Large number of aperture blades Be close to the number of large and round Overlapping wings, slow down Paint fell, internal reflection occurs Pentax patent The shape of the aperture having a plurality of pairs of different edge Depending on the aperture value, use the optimal set Close to the circular aperture in which Last edited by Docrwm; 05-06-2013 at 08:12 PM.

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07-19-2012, 07:29 AM	#3
Vasyl Veteran Member Join Date: Aug 2010 Photos: Gallery Posts: 648	It looks similar to old Yashinon DX 45mm F1.4...but there are 6 blades...

07-19-2012, 10:03 AM	#4
wlachan Veteran Member Join Date: Sep 2006 Location: Canada Photos: Albums Posts: 2,625	My concern is that if they had trouble aligning 8-9 blades with existing lenses, what will misaligned 14 blades look like? Will they cancel out each other somehow? Will Ricoh tighten up QC enough to make it work (on most production samples)?

07-19-2012, 02:20 PM	#5
RXrenesis8 Veteran Member Join Date: Jan 2011 Location: Orlando, FL (USA) Photos: Gallery \| Albums Posts: 523	Originally posted by wlachan My concern is that if they had trouble aligning 8-9 blades with existing lenses, what will misaligned 14 blades look like? Looks like one set will be used for some apertures, and the other set will be used for the rest. ex: one set goes from 1.4-5.6, and the second set goes from 5.6-22

07-21-2012, 09:39 AM	#6
Na Horuk Veteran Member Join Date: Feb 2012 Location: Slovenia, probably Photos: Gallery \| Albums Posts: 11,186	Looks interesting, but how does this keep cost down? Compared to having, for example, 10 rounded blades? Isn't 7x2 in two modules more parts and more complicated than simply having a few more blades?

07-21-2012, 10:03 AM - 1 Like	#7
Mehlsack Senior Member Join Date: Sep 2010 Location: Innsbruck Posts: 283	yep it is and it is even more likely to fail..... so i think we will see it in new DA* Lenses

07-21-2012, 10:15 AM	#8
Na Horuk Veteran Member Join Date: Feb 2012 Location: Slovenia, probably Photos: Gallery \| Albums Posts: 11,186	Originally posted by Mehlsack yep it is and it is even more likely to fail..... so i think we will see it in new DA* Lenses LOL good observation

07-21-2012, 10:26 AM	#9
Kunzite Pentaxian Join Date: Apr 2007 Location: Romania Posts: 15,132	It seems to me this would be easier to align/make/whatever and more reliable than a "normal" 14 blades aperture (this is the point of the patent, right?). Which means it won't be used in the DA*s

07-21-2012, 10:55 AM	#10
Clavius Veteran Member Join Date: Feb 2011 Location: De Klundert Photos: Gallery Posts: 4,150	Pretty brilliant. Why wasn't it done before?

07-21-2012, 10:59 AM	#11
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Originally posted by Clavius Pretty brilliant. Why wasn't it done before? Engineers are conservative by nature would be my guess.

07-21-2012, 11:54 AM	#12
MysteryOnion Giveaway winner! Join Date: Dec 2007 Location: beantown Photos: Albums Posts: 944	It looks like the design may give a shorter response time. Is this a bit to make a non-retrofocus design?

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07-21-2012, 12:07 PM	#13
Arthur Dent New Member Join Date: Jul 2012 Posts: 3	I have an old 12mm fisheye lens that only has f/8, 11, and 16 openings that are round holes in a flat disk that are moved into the light path as you turn the aperture ring. Those are truly round, not polygonal approximations

07-21-2012, 12:31 PM	#14
Mehlsack Senior Member Join Date: Sep 2010 Location: Innsbruck Posts: 283	Sorry, i am realy thinking about that and i dont see any advantage against "normal" 14 blades :S

07-21-2012, 12:38 PM	#15
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Originally posted by Mehlsack Sorry, i am realy thinking about that and i dont see any advantage against "normal" 14 blades :S Fewer moving parts?