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07-19-2012, 01:57 AM - 1 Like   #1
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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
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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.
07-19-2012, 07:29 AM   #3
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It looks similar to old Yashinon DX 45mm F1.4...but there are 6 blades...
07-19-2012, 10:03 AM   #4
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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
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QuoteOriginally posted by wlachan Quote
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
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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
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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
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QuoteOriginally posted by Mehlsack Quote
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
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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
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Pretty brilliant. Why wasn't it done before?
07-21-2012, 10:59 AM   #11
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QuoteOriginally posted by Clavius Quote
Pretty brilliant. Why wasn't it done before?
Engineers are conservative by nature would be my guess.
07-21-2012, 11:54 AM   #12
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It looks like the design may give a shorter response time. Is this a bit to make a non-retrofocus design?
07-21-2012, 12:07 PM   #13
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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
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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
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QuoteOriginally posted by Mehlsack Quote
Sorry, i am realy thinking about that and i dont see any advantage against "normal" 14 blades :S
Fewer moving parts?
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