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06-21-2018, 09:30 AM - 7 Likes   #1
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HD DA*11-18/2.8 patent was filed by Ricoh in Japan.


A new patent for a Pentax DA*11-18mm f/2.8 lens was filed by Ricoh in Japan.
detail:??2018-97053 | ???????IP Force?

06-21-2018, 09:36 AM - 3 Likes   #2
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Good news.This should put a rest to conjectures about this lens being a Tokina rebadge somehow.
06-21-2018, 09:40 AM - 1 Like   #3
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I see this was filled under Ricoh, not Ricoh Imaging - that explains the recent lack of patent applications for Ricoh Imaging

---------- Post added 21-06-18 at 07:40 PM ----------

QuoteOriginally posted by thibs Quote
Good news.This should put a rest to conjectures about this lens being a Tokina rebadge somehow.
I'm afraid it won't be enough
06-21-2018, 09:42 AM   #4
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Good news! thanks for sharing

06-21-2018, 09:45 AM   #5
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Now we just need the release date
06-21-2018, 10:03 AM - 1 Like   #6
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QuoteOriginally posted by Kunzite Quote
I see this was filled under Ricoh, not Ricoh Imaging - that explains the recent lack of patent applications for Ricoh Imaging

---------- Post added 21-06-18 at 07:40 PM ----------


I'm afraid it won't be enough
I'm afraid it wont be cheap enough.
06-21-2018, 10:06 AM   #7
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QuoteOriginally posted by OoKU Quote
A new patent for a Pentax DA*11-18mm f/2.8 lens was filed by Ricoh in Japan.
detail:??2018-97053 | ???????IP Force?
Which is the focusing group - roughly what mass will some motor have to move??
06-21-2018, 10:52 AM   #8
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It looks like a larger lens, but I’ll patiently wait for the release date. Hopefully there’s a bit of time between the release of the 50 and this.

06-21-2018, 11:22 AM - 1 Like   #9
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15 elements in 11 groups and one aspherical surface. Looks about right.
06-21-2018, 11:30 AM   #10
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If someone was intimidated by the Japanese or just lazy (as I often am), the patent is clearly about a ~11-18mm f/2.8 for the APS-C format.
06-21-2018, 12:57 PM - 1 Like   #11
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QuoteOriginally posted by Kunzite Quote
If someone was intimidated by the Japanese or just lazy (as I often am), the patent is clearly about a ~11-18mm f/2.8 for the APS-C format.
You don't need to read Japanese to get that...the name says it all.

DA* 11-18mm
06-21-2018, 12:59 PM   #12
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I'm talking about the patent (link in the OP), not the thread.
06-21-2018, 01:29 PM   #13
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QuoteOriginally posted by reh321 Quote
Which is the focusing group - roughly what mass will some motor have to move??
Based on the link, it looks like both the second and third group moves. So I'm assuming this is an internal focus and internal zoom?
06-21-2018, 02:06 PM   #14
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QuoteOriginally posted by Dipsoid Quote
Based on the link, it looks like both the second and third group moves. So I'm assuming this is an internal focus and internal zoom?
I asked because focus speed seems to depend so much on ability of motor to move that mass.
06-21-2018, 02:28 PM - 5 Likes   #15
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There are seven examples in the patent request.

Minimum focal length is between 11.25mm an 11.29 mm. Maximum focal length is between 17.6mm and 17.7mm.

Maximum aperture is either f/2.8 (four examples) or f/2.9 (three examples).

There are basically two optical formulas with variants:

- three examples include 15 elements in 11 groups; their length at 11mm is around 8.9cm and they extend by 1.7mm to 4.7mm at 18mm.
- four examples include 16 elements in 11 groups; their length is around 9.8cm at 11mm and changes only very slightly at 18mm.

All examples include three aspheric elements: one or two (depending on whether 16/11 or 15/11) in the first element group, named G1, and two or one in the fourth element group, named G4.

G1 moves a bit when zooming in from 11mm to 18mm: towards the subject for six examples out of seven, towards the image in one example. The second element group, named G2, also moves when zooming in, towards the subject. The third element group, named G3, also moves when zooming but its movement is more complex and varies from an example to another. G4 moves towards the subject when zooming in.

Focus is apparently done by moving some elements within G2.

Below is the optical diagram of an example with 16 elements in 11 groups.

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