New Patent for Pentax APS-C 18-100 F2.8

Mistral75 · 12-29-2021, 06:14 AM - **1 Like**

Originally posted by wadge22

I mean... aren't there video lenses close to that spec? I'm sure they're for a smaller sensor, I don't really know how much smaller.
(...)

That's a telephoto zoom designed for 16mm cameras. APS-C is close to the Super35 format, a bit bigger than 35mm and much bigger than 16mm.

Mistral75 · 12-29-2021, 06:28 AM - **1 Like**

Originally posted by UncleVanya

Except we have someone on the thread who has claimed to have guessed correctly every time by simply looking at the current offerings - that suggests the obfuscation is worthless.

It's not about obfuscation, the corresponding lens is obvious...

Originally posted by Mistral75

(...)

2020-154286 includes nine numerical examples, of which seven 16-50mm f/2.9, one 15-45mm f/2.9 and one 18-100mm f/2.9 (example 9).

2021-192088 includes ten numerical examples, of which eight 16-50mm f/2.9, one 15-45mm f/2.9 and one 18-100mm f/2.9 (example 9).

(...)

...in particular when the lens diagrams of the numerical examples in the patent application correspond to the lens diagram of a product that was released in the meantime (between filing and publication), in this case the HD Pentax-DA★ 16-50mm f/2.8 ED PLM AW.

Mistral75 · 12-29-2021, 06:29 AM

Originally posted by Ian Stuart Forsyth

I have seen 30-100ƒ2 for 4/3's

That's a 3.3x telezoom, not a 5.5x trans-standard lens (going from wide to tele).

**ProfessorBuzz** · 12-29-2021, 06:49 AM

I'm still holding out for the HD PENTAX Super Takumar D FA 645 Limited 8mm-2000mm f/1.2 ED AW WR SR TS with the 77mm filter threads at the back, and Ricoh 100% photon capture guarantee. The older version I have doesn't have the Tilt-Shift capabilities or the new HD coatings.

**UncleVanya** · 12-29-2021, 06:53 AM

Originally posted by Mistral75

To prevent a third party from using the corresponding invention for a lens with a very different focal length. If all numerical examples were for a 16-50mm f/2.8, said third party could claim that the patent only prevents them to design such 16-50mm f/2.8 lenses.

This makes sense.

thibs · 12-29-2021, 06:54 AM

Originally posted by fs999

I'm sure they can put a PLM in replacement of the ring SDM in the actual 18-135...

Probably not.

Kunzite · 12-29-2021, 07:03 AM - **4 Likes**

Originally posted by thibs

Probably not.

They'd need to make a ring SDM version of the 18-135 DC first

**lmd91343** · 12-29-2021, 07:45 AM

Originally posted by lmd91343

I'm holding out for the 16-250mm F1.4 DFA*. I hear it will be available by next Christmas.

The only question is will it have a detachable tripod foot.

Oops I forgot. It also will weigh less in than a pound. (450g)

**Serkevan** · 12-29-2021, 07:51 AM - **1 Like**

Originally posted by ProfessorBuzz

I'm still holding out for the HD PENTAX Super Takumar D FA 645 Limited 8mm-2000mm f/1.2 ED AW WR SR TS with the 77mm filter threads at the back, and Ricoh 100% photon capture guarantee. The older version I have doesn't have the Tilt-Shift capabilities or the new HD coatings.

Why would you suggest, on such a zoom, an f/1.2 aperture? That's absolutely unreasonable.

F/0.95 is where it's at these days.

**TwoUptons** · 12-29-2021, 08:18 AM - **1 Like**

Originally posted by Serkevan

Why would you suggest, on such a zoom, an f/1.2 aperture? That's absolutely unreasonable.

F/0.95 is where it's at these days.

It's a Limited, so it would be F/0.97 or something, just to be different

-Eric

thibs · 12-29-2021, 08:44 AM

Originally posted by Kunzite

They'd need to make a ring SDM version of the 18-135 DC first

Indeed, they would have to.

**ProfessorBuzz** · 12-29-2021, 11:11 AM

Originally posted by TwoUptons

It's a Limited, so it would be F/0.97 or something, just to be different

-Eric

Well I was hoping for the weight reduction I'd get with a smaller aperture - it's few Kg from 0.97 to 1.2. The carbon-fibre wrist strap from Peak Designs won't hold the f/0.97 version.

**pres589** · 12-29-2021, 12:41 PM - **1 Like**

Is this the new "what lens are you wishing they would make?" thread?

**lmd91343** · 12-29-2021, 01:08 PM

Originally posted by Serkevan

Why would you suggest, on such a zoom, an f/1.2 aperture? That's absolutely unreasonable.

F/0.95 is where it's at these days.

These days?

Canon was marketing the f0.95 "Dream Lens" in the early '60s!

You need to do better than that!

P.S. It got a bit of a bad rep because of its ultra thin DOF with rangefinder focusing. When I use on my Sony A7II it is sharp and easier to focus.

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12-29-2021, 06:14 AM - 1 Like	#31
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by wadge22 I mean... aren't there video lenses close to that spec? I'm sure they're for a smaller sensor, I don't really know how much smaller. (...) That's a telephoto zoom designed for 16mm cameras. APS-C is close to the Super35 format, a bit bigger than 35mm and much bigger than 16mm.

12-29-2021, 06:28 AM - 1 Like	#32
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by UncleVanya Except we have someone on the thread who has claimed to have guessed correctly every time by simply looking at the current offerings - that suggests the obfuscation is worthless. It's not about obfuscation, the corresponding lens is obvious... Originally posted by Mistral75 (...) 2020-154286 includes nine numerical examples, of which seven 16-50mm f/2.9, one 15-45mm f/2.9 and one 18-100mm f/2.9 (example 9). 2021-192088 includes ten numerical examples, of which eight 16-50mm f/2.9, one 15-45mm f/2.9 and one 18-100mm f/2.9 (example 9). (...) ...in particular when the lens diagrams of the numerical examples in the patent application correspond to the lens diagram of a product that was released in the meantime (between filing and publication), in this case the HD Pentax-DA★ 16-50mm f/2.8 ED PLM AW.

12-29-2021, 06:29 AM	#33
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by Ian Stuart Forsyth I have seen 30-100ƒ2 for 4/3's That's a 3.3x telezoom, not a 5.5x trans-standard lens (going from wide to tele).

12-29-2021, 06:49 AM	#34
ProfessorBuzz Loyal Site Supporter Join Date: Feb 2018 Posts: 1,903	I'm still holding out for the HD PENTAX Super Takumar D FA 645 Limited 8mm-2000mm f/1.2 ED AW WR SR TS with the 77mm filter threads at the back, and Ricoh 100% photon capture guarantee. The older version I have doesn't have the Tilt-Shift capabilities or the new HD coatings.

12-29-2021, 06:53 AM	#35
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,398	Originally posted by Mistral75 To prevent a third party from using the corresponding invention for a lens with a very different focal length. If all numerical examples were for a 16-50mm f/2.8, said third party could claim that the patent only prevents them to design such 16-50mm f/2.8 lenses. This makes sense.

12-29-2021, 06:54 AM	#36
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Originally posted by fs999 I'm sure they can put a PLM in replacement of the ring SDM in the actual 18-135... Probably not.

12-29-2021, 07:03 AM - 4 Likes	#37
Kunzite Pentaxian Join Date: Apr 2007 Location: Romania Posts: 15,132	Originally posted by thibs Probably not. They'd need to make a ring SDM version of the 18-135 DC first

12-29-2021, 07:45 AM	#38
lmd91343 Site Supporter Join Date: Jul 2009 Location: Los Angeles, CA USA Photos: Gallery \| Albums Posts: 1,027	Originally posted by lmd91343 I'm holding out for the 16-250mm F1.4 DFA*. I hear it will be available by next Christmas. The only question is will it have a detachable tripod foot. Oops I forgot. It also will weigh less in than a pound. (450g)

12-29-2021, 07:51 AM - 1 Like	#39
Serkevan Site Supporter Join Date: May 2019 Photos: Albums Posts: 5,976	Originally posted by ProfessorBuzz I'm still holding out for the HD PENTAX Super Takumar D FA 645 Limited 8mm-2000mm f/1.2 ED AW WR SR TS with the 77mm filter threads at the back, and Ricoh 100% photon capture guarantee. The older version I have doesn't have the Tilt-Shift capabilities or the new HD coatings. Why would you suggest, on such a zoom, an f/1.2 aperture? That's absolutely unreasonable. F/0.95 is where it's at these days.

12-29-2021, 08:18 AM - 1 Like	#40
TwoUptons Loyal Site Supporter Join Date: Nov 2015 Photos: Albums Posts: 4,212	Originally posted by Serkevan Why would you suggest, on such a zoom, an f/1.2 aperture? That's absolutely unreasonable. F/0.95 is where it's at these days. It's a Limited, so it would be F/0.97 or something, just to be different -Eric

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12-29-2021, 08:44 AM	#41
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Originally posted by Kunzite They'd need to make a ring SDM version of the 18-135 DC first Indeed, they would have to.

12-29-2021, 11:11 AM	#42
ProfessorBuzz Loyal Site Supporter Join Date: Feb 2018 Posts: 1,903	Originally posted by TwoUptons It's a Limited, so it would be F/0.97 or something, just to be different -Eric Well I was hoping for the weight reduction I'd get with a smaller aperture - it's few Kg from 0.97 to 1.2. The carbon-fibre wrist strap from Peak Designs won't hold the f/0.97 version.

12-29-2021, 12:41 PM - 1 Like	#43
pres589 Site Supporter Join Date: Jan 2014 Location: Wichita, KS Photos: Albums Posts: 4,529	Is this the new "what lens are you wishing they would make?" thread?

12-29-2021, 01:08 PM	#44
lmd91343 Site Supporter Join Date: Jul 2009 Location: Los Angeles, CA USA Photos: Gallery \| Albums Posts: 1,027	Originally posted by Serkevan Why would you suggest, on such a zoom, an f/1.2 aperture? That's absolutely unreasonable. F/0.95 is where it's at these days. These days? Canon was marketing the f0.95 "Dream Lens" in the early '60s! You need to do better than that! P.S. It got a bit of a bad rep because of its ultra thin DOF with rangefinder focusing. When I use on my Sony A7II it is sharp and easier to focus.