Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-21-2018, 02:50 PM   #16
Site Supporter
Site Supporter
ffking's Avatar

Join Date: Nov 2015
Location: Poole
Posts: 4,979
You'd almost think they were trying to make it more difficult for other people to design a rival 11-18mm APS-C

06-21-2018, 03:02 PM   #17
Journeyman Cat Wrangler
Loyal Site Supporter
SSGGeezer's Avatar

Join Date: Jun 2017
Location: Maine, U.S.
Photos: Gallery | Albums
Posts: 4,796
QuoteOriginally posted by ffking Quote
You'd almost think they were trying to make it more difficult for other people to design a rival 11-18mm APS-C
Seems that way, doesn't it! And having multiple example means whichever way you go to try to copy this one, you are going to get hit with a patent infringement suit! Looks complicated as heck though. Hope the QC is up to it!
06-21-2018, 03:07 PM   #18
Pentaxian




Join Date: May 2015
Posts: 1,196
Come on Pentax just get it out already!

;-)
06-21-2018, 03:09 PM   #19
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 17,450
QuoteOriginally posted by Mistral75 Quote
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.
The good news is that the G2 units look relatively small to me, so this might be another lens which helps improve Pentax's AF reputation record / reputation

06-21-2018, 07:54 PM - 1 Like   #20
Pentaxian
Paul the Sunman's Avatar

Join Date: Aug 2011
Location: Melbourne
Photos: Gallery
Posts: 2,827
I just got a notice that the DA 12-24 is on sale at the Australian Pentax web store for half price! I wonder if that's an indication that the 11-18 is imminent.
06-21-2018, 08:26 PM   #21
JPT
Pentaxian




Join Date: Jan 2012
Location: Tokyo
Photos: Gallery
Posts: 1,732
I think it would be hard to justify keeping the DA14mm f2.8 in production, especially if the new zoom is sharper. The DA 12-25 f4, on the other hand, could still have a place with a price cut.
06-21-2018, 09:01 PM   #22
Moderator
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 7,461
QuoteOriginally posted by Paul the Sunman Quote
I just got a notice that the DA 12-24 is on sale at the Australian Pentax web store for half price! I wonder if that's an indication that the 11-18 is imminent.
The lens roadmap shows the HD PENTAX-DA* 11-18mm F2.8 ED DC AW due out Summer 2018
06-21-2018, 10:13 PM - 1 Like   #23
Site Supporter
Site Supporter




Join Date: Jun 2010
Location: Central Coast, CA
Posts: 780
Since it is a 2.8 lens it will be heavier and more expensive. I have the Tamron 10-24. It is lighter and cost me $260. ( But I still would like bigger and more expensive ).

06-21-2018, 10:24 PM - 1 Like   #24
Pentaxian




Join Date: Jan 2011
Location: New York
Posts: 4,641
QuoteOriginally posted by Kunzite Quote
If someone was intimidated by the Japanese ...
I had to read that a second time to realize you were talking about the Japanese language
06-21-2018, 11:42 PM - 1 Like   #25
Pentaxian




Join Date: Apr 2007
Location: Romania
Posts: 13,175
Sorry. I thought it was obvious, as the Japanese ninja are all busy watching Kenspo
06-21-2018, 11:54 PM - 2 Likes   #26
Loyal Site Supporter
Loyal Site Supporter
clackers's Avatar

Join Date: Jul 2013
Location: Melbourne
Photos: Albums
Posts: 14,356
QuoteOriginally posted by Kunzite Quote
Sorry. I thought it was obvious, as the Japanese ninja are all busy watching Kenspo
Yeah, he's about one leak away from being ritually disemboweled!
06-22-2018, 01:13 AM   #27
Senior Member




Join Date: Jul 2014
Posts: 231
If 11-18/2.8 would be also released on 29th of June, I would be so happy
06-22-2018, 01:23 AM   #28
Pentaxian




Join Date: Dec 2015
Posts: 597
Original Poster
QuoteOriginally posted by x4rd Quote
If 11-18/2.8 would be also released on 29th of June, I would be so happy
But,not.
06-22-2018, 06:03 AM   #29
Loyal Site Supporter
Loyal Site Supporter




Join Date: May 2016
Location: East Coast
Posts: 2,515
What has typically been the history of the date of the patent request filing in relation to release dates? I would think that the patent request would come long before production, but is it the other way around so as not to tip your hand to the competition?
06-22-2018, 06:09 AM   #30
Pentaxian
LensBeginner's Avatar

Join Date: Sep 2014
Photos: Albums
Posts: 4,594
QuoteOriginally posted by clickclick Quote
What has typically been the history of the date of the patent request filing in relation to release dates? I would think that the patent request would come long before production, but is it the other way around so as not to tip your hand to the competition?
It has been previously said in the other thread I think... somewhere in the middle of the cycle, when other companies start to get involved. So not at the very beginning. I'll try to find the post.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
design, hd da*11-18/2.8 patent, lens, patent, patents, pentax news, pentax rumors, ricoh
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
HD Pentax-DA 645 90-180mm or 80-160mm f/4.5ED AW SR lens patent filed in Japan sculptor666 Pentax News and Rumors 28 08-16-2018 01:09 PM
New DA*16-50/2.8 patent filed in Japan OoKU Pentax News and Rumors 103 04-01-2018 02:45 AM
Ricoh has a new patent for an improved smc Pentax DA 16-50mm maw Pentax News and Rumors 3 03-22-2018 02:49 PM
Happy 11.11.11 11:11:11 m8o General Talk 10 11-12-2011 08:17 PM
new 26 - 340 f3.3 -5.6 zoom patent filed ukwoody Pentax News and Rumors 8 05-15-2011 12:45 AM



All times are GMT -7. The time now is 04:09 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top