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11-29-2014, 04:07 PM   #121
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QuoteOriginally posted by Mistral75 Quote
As surprising as this might be, the optical formula you are showing and the corresponding patent are that of 06 Telephoto Zoom (15-45mm f/2.8 in Q mount). In the patent's description, 5 embodiments correspond to 06 Telephoto Zoom (Tables 2, 5, 8, 11 et 17) and one to a 70-200mm covering the 24x36 image circle (Table 14).

See Publication Images for further details (this is the US extension of the Japanese patent).
Numerical Embodiment 5

[0106] FIGS. 25 through 30D and Tables 13 through 15 show a fifth numerical embodiment of the zoom lens system according to the present invention. FIG. 25 shows a lens arrangement of the fifth numerical embodiment of the zoom lens system when focusing on an object at infinity at the long focal length extremity. FIGS. 26A, 26B, 26C and 26D show various aberrations that occurred in the lens arrangement shown in FIG. 25. FIGS. 27A, 27B, 27C and 27D show lateral aberrations that occurred in the lens arrangement shown in FIG. 25. FIG. 28 shows a lens arrangement of the fifth numerical embodiment of the zoom lens system when focusing on an object at infinity at the short focal length extremity. FIGS. 29A, 29B, 29C and 29D show various aberrations that occurred in the lens arrangement shown in FIG. 28. FIGS. 30A, 30B, 30C and 30D show lateral aberrations that occurred in the lens arrangement shown in FIG. 28. Table 13 shows the lens surface data, Table 14 shows various zoom lens system data, and Table 15 shows the lens group data of the zoom lens system according to the fifth numerical embodiment.

[0107] The lens arrangement [I]of the fifth numerical embodiment is the same as that of the third numerical embodiment except for the following aspect:

[0108] (1) The positive lens element 13 of the first sub-lens group G1a is a positive meniscus lens element having a convex surface on the object side.

[0109] (2) In regard to the second lens group G2, the negative lens element 24 is a biconcave lens element, the positive lens element 26 is a biconvex positive lens element, and the negative lens element 27 is a biconcave negative lens element.

[0110] (3) In regard to the fourth lens group G4, the positive lens element 42 is a positive meniscus lens element having a convex surface on the object side, and the negative lens element 43 is a negative meniscus lens element having a convex surface on the object side.

TABLE-US-00013 TABLE 13 SURFACE DATA Surf. No. r d N(d) .nu.d 1 -1078.793 3.64 1.67270 32.2 2 228.294 1.82 3 318.254 15.02 1.49700 81.6 4 -283.104 0.45 5 160.240 9.97 1.48749 70.4 6 402.704 d6 7 121.556 14.61 1.49700 81.6 8 1644.390 d8 9 -332.485 3.18 1.80420 46.5 10 92.022 3.79 11 -115.625 3.18 1.61800 63.4 12 49.051 7.68 1.84666 23.8 13 -769.319 1.70 14 -162.801 3.18 1.83400 37.3 15 134.984 d15 16 .infin. 1.00 (Diaphragm) 17 -900.404 5.32 1.72916 54.7 18 -101.728 0.23 19 93.925 8.62 1.49700 81.6 20 -80.655 2.28 1.84666 23.8 21 -185.427 d21 22 58.914 4.70 1.72916 54.7 23 117.106 0.23 24 29.271 11.83 1.49700 81.6 25 105.898 4.09 1.58267 46.6 26 22.521 17.32 27 102.961 6.63 1.69680 55.5 28 -77.290 3.10 29 -41.651 2.05 1.74400 44.9 30 87.545 0.23 31 49.088 9.35 1.48749 70.4 32 -93.640 22.75 33 .infin. 2.50 1.51633 64.1 34 .infin. 9.19 35 .infin. 2.27 1.51633 64.1 36 .infin. --

TABLE-US-00014 TABLE 14 ZOOM LENS SYSTEM DATA Zoom Ratio 2.82 Short Focal Length Intermediate Long Focal Length Extremity Focal Length Extremity FNO. 2.9 3.0 2.9 f 70.21 118.15 198.32 W 17.8 10.4 6.1 Y 21.64 21.64 21.64 fB 2.49 2.49 2.48 L 296.16 296.16 296.16 d6 22.46 17.20 23.42 d8 3.43 58.65 84.10 d15 32.85 21.40 1.28 d21 53.02 14.51 2.96

11-29-2014, 07:20 PM   #122
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I'm not a technical person. S . Does that mean it's full frame?
11-29-2014, 07:26 PM   #123
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QuoteOriginally posted by totsmuyco Quote
I'm not a technical person. S . Does that mean it's full frame?
Probably no one outside of Ricoh knows for sure.
11-30-2014, 03:57 AM   #124
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QuoteOriginally posted by totsmuyco Quote
I'm not a technical person. S . Does that mean it's full frame?
The lens described in Table 14 of the patent definitely is. Y = 21.64 is the radius of the image circle in millimeters thus the latter's diameter is equal to 43.28mm.

And √ (24 + 36) = 43.27mm.

12-03-2014, 08:21 AM   #125
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Based off prior announcements, when can we expect to learn more about this Large-aperture telephoto zoom lens and Super-telephoto zoom lens?
12-03-2014, 08:52 AM   #126
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QuoteOriginally posted by Newtophotos Quote
Based off prior announcements, when can we expect to learn more about this Large-aperture telephoto zoom lens and Super-telephoto zoom lens?
Probably Ricoh could tell us that it would be out in a specific quarter of a specific year but if they could they (and likely any other camera company) wouldn't tell us for a number of reasons. I suspect that we will see the lens next year but its only my guess. Ricoh/Pentax is helping me re-learn the skill of "patience"..... ;-)
12-03-2014, 08:59 AM   #127
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QuoteOriginally posted by woodywesty Quote
Probably Ricoh could tell us that it would be out in a specific quarter of a specific year but if they could they (and likely any other camera company) wouldn't tell us for a number of reasons. I suspect that we will see the lens next year but its only my guess. Ricoh/Pentax is helping me re-learn the skill of "patience"..... ;-)
Next year meaning 2015?
12-03-2014, 09:12 AM   #128
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Yes.... they baited the hook by showing "prototypes" this past Fall so they should be in the development stage at this point. But again... that's only a guess.

12-03-2014, 06:21 PM   #129
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QuoteOriginally posted by woodywesty Quote
...Ricoh/Pentax is helping me re-learn the skill of "patience"..... ;-)

Me too, in regards to the 120-400.
12-03-2014, 09:08 PM   #130
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QuoteOriginally posted by Dieseler Quote
Me too, in regards to the 120-400.
Mee too, + 1
12-08-2014, 02:48 AM   #131
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I have read some time ago about new Pentax wide - zoom lens, something about 10-20, any news about this lens?
12-08-2014, 03:16 AM   #132
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I'm not sure about that. I know there are 2 models of 10-20 from sigma.
12-08-2014, 04:33 AM   #133
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QuoteOriginally posted by therion Quote
I have read some time ago about new Pentax wide - zoom lens, something about 10-20, any news about this lens?
There is one on the roadmap (http://www.ricoh-imaging.co.jp/japan/products/lens/images/K_Mount_Lens.pdf), but not much is known about it so far.
12-08-2014, 05:15 AM   #134
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QuoteOriginally posted by Mistral75 Quote
The lens described in Table 14 of the patent definitely is. Y = 21.64 is the radius of the image circle in millimeters thus the latter's diameter is equal to 43.28mm.

And √ (24 + 36) = 43.27mm.
You are right, I made the same computation, but what about image stabilisation ? I was expecting a slightly larger circle, or in lens image stabilisation ?
12-08-2014, 05:46 AM   #135
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I'm in great expectation about the "Large diameter telephoto zoom"....
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