Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-31-2016, 08:16 PM   #16
Pentaxian
RobA_Oz's Avatar

Join Date: Nov 2008
Location: Tasmania, Australia
Photos: Gallery
Posts: 4,124
QuoteOriginally posted by northcoastgreg Quote
I agree. However, a 35-80 f4 could be a fairly compact lens — might it not be a DFA limited zoom? Bring on a DFA 20-35 f4 Limited and a DFA 80-150 f4 Limited and you have a trio of compact, high quality zooms that will be unique to Pentax.
A friend has drawn my attention to tests conducted elsewhere that indicate the DA20-40 has some (reportedly light) vignetting below 24mm, on the K-1. If so, this indicates that it may be possible to tweak the design of the 20-40 to produce a D-FA version, which would be a nice, lightweight f2.8-4 Limited lens, assuming the maximum aperture could be maintained in the process.

Given that he (and I) just ordered a K-1 (each) and he has the DA20-40 (I was smugly content with my DA*16-50, up till now), it's an assertion that will be interesting to test. Still, I've got the FA20 and the FA*28-70, which are both f2.8 lenses.

05-31-2016, 08:49 PM - 1 Like   #17
Senior Member
Mock's Avatar

Join Date: Feb 2009
Location: Edmonton
Photos: Gallery | Albums
Posts: 290
QuoteOriginally posted by VoiceOfReason Quote
Imagine a 24-135 f/4 WR....
The zoom ranges in this thread keep getting wider and wider! I'd really like a DFA 12-1200mm f/4 DC WR, since it weighs 30 pounds less than the DFA* f/2.8 version, and will foot in the boot of my car.
05-31-2016, 09:20 PM   #18
Veteran Member
robjmitchell's Avatar

Join Date: Oct 2007
Location: Melbourne Aus
Posts: 1,144
QuoteOriginally posted by johnmflores Quote
What benefits would the K-1 with a bag of F4 zooms have (if any) over a K-3 II with a bag of F2.8 zooms?
Principally resolution and dr for landscape shooters who dont want to carry really expensive bricks. Not that this lens fits the bill exactly.
05-31-2016, 10:08 PM   #19
Pentaxian
thibs's Avatar

Join Date: Jun 2007
Location: Belgium
Photos: Albums
Posts: 5,161
QuoteOriginally posted by VoiceOfReason Quote
Imagine a 24-135 f/4 WR....
AFAICT, even Canon does not make such lens.
It's more likely we'd see 28-135 or 24-105.

05-31-2016, 10:32 PM   #20
Veteran Member
zmohie's Avatar

Join Date: Feb 2009
Location: egypt
Photos: Gallery | Albums
Posts: 373
QuoteOriginally posted by mee Quote
A coherent f/4 lens strategy would include a 24-105 f/4 in my book.. I'd even take a 24-80 f/4 if it was sharp on the wide end..
also 24-70 f 4 and 70-200 f4 at a decent price would be cool!
05-31-2016, 10:43 PM   #21
ogl
Pentaxian
ogl's Avatar

Join Date: Dec 2007
Location: Siberia
Photos: Gallery | Albums
Posts: 7,112
Maybe Ricoh plan to produce the line of F4 zoom lenses for FF?

The next patent for 18-35/4?

It seems to me 35-80 is better optically than 28-105
But focal range 35-80 looks rather vintage for modern days...

Could it be very compact? The smallest FF zoom in the world? Or it could the sharpest FF zoom...

Just my fantasies...)

Last edited by ogl; 05-31-2016 at 10:52 PM.
05-31-2016, 10:48 PM - 1 Like   #22
Site Supporter
Zygonyx's Avatar

Join Date: Jun 2011
Location: Ile de France
Posts: 2,951
QuoteOriginally posted by zmohie Quote
also 24-70 f 4 and 70-200 f4 at a decent price would be cool!
Yes, but rangewise overlapping with f/2.8 lenses, hence killing sales...

This 20-35/35-80/100-300 f/4 line'up, if confirmed, is quite interesting and makes sense as far as compactness and IQ are (potentially) concerned.
05-31-2016, 10:58 PM   #23
ogl
Pentaxian
ogl's Avatar

Join Date: Dec 2007
Location: Siberia
Photos: Gallery | Albums
Posts: 7,112
QuoteOriginally posted by Zygonyx Quote
Yes, but rangewise overlapping with f/2.8 lenses, hence killing sales...

This 20-35/35-80/100-300 f/4 line'up, if confirmed, is quite interesting and makes sense as far as compactness and IQ are (potentially) concerned.
The same thoughts


06-01-2016, 01:06 AM   #24
Forum Member
mrmentera's Avatar

Join Date: Nov 2009
Location: Falun
Posts: 81
QuoteOriginally posted by OoKU Quote
Ricoh recently filed a patent in a Japan for a 35-80mm f/4 full frame lens that is most likely designed for the Pentax K-1 DSLR camera. Here are the details:



Patent No. 2016-99586
Published on May 30th, 2016
Filing date: October 26th, 2014
Zoom ratio: 2.19
FNO (aperture): 4.1 – 4.1 – 4.1
f (focal length): 36.11 51.17 79.07
L (length): 160.34 166.92 192.65
Ricoh 35-80mm F4?????????????So-net???

Is it possible to predict if itīs a compact design from the drawing? Seem to be an awful lot of glass in it..

Length? Is that for the lens?
06-01-2016, 02:09 AM   #25
Pentaxian
gazonk's Avatar

Join Date: Feb 2009
Location: Oslo area, Norway
Photos: Gallery | Albums
Posts: 3,509
QuoteOriginally posted by mrmentera Quote
Length? Is that for the lens?
I would guess that it's front element to focal plane distance, so it wouldn't be quite as huge as it may seem.

But is it really a K-mount lens? What if it is a 645 lens?
06-01-2016, 02:12 AM   #26
ogl
Pentaxian
ogl's Avatar

Join Date: Dec 2007
Location: Siberia
Photos: Gallery | Albums
Posts: 7,112
Pentax Zoom Lenses with Medium Focal Lengths
it was rather long line of 35 mm middle zooms in film era
06-01-2016, 02:57 AM   #27
Pentaxian
gazonk's Avatar

Join Date: Feb 2009
Location: Oslo area, Norway
Photos: Gallery | Albums
Posts: 3,509
The construction seems to be more complex than the 24-70/2.8, with one element more. That's quite a bit more complex than the 20-40 Ltd. I bet it's for the 645 system.
06-01-2016, 03:13 AM - 1 Like   #28
Site Supporter




Join Date: Dec 2015
Location: Brisbane, Australia
Posts: 92
QuoteOriginally posted by ogl Quote
Pentax Zoom Lenses with Medium Focal Lengths
it was rather long line of 35 mm middle zooms in film era
But only one of those was from the 90's, the FA 35-80. That was a nicely sized unit though.

As zoom quality improved consumers voted with their wallets and the end result was more width. The rest of the FA wide angle zooms show Pentax was in tune with that shift at the time. A 24-80 (or better yet, a new constant aperture 24-90!) makes more commercial sense these days, especially with a camera orientated to field use. WR isn't much good if you need to swap lenses constantly to move between wide angle and normal. Given f4 zooms would be targeting users who value a balance between size, weight, IQ and cost a 2 lens setup covering wide to normal and then normal to tele makes sense. A third lens to cover wide angle focal lengths seems like extra cost and weight for the sake of it.

If the lens is tiny and has great IQ then Ricoh will have something to market, but without some stellar qualities 35-80mm is going to feel like it should have been left in the manual focus era (and in that case I'd much rather an A 35-105mm f3.5).
06-01-2016, 03:20 AM   #29
ogl
Pentaxian
ogl's Avatar

Join Date: Dec 2007
Location: Siberia
Photos: Gallery | Albums
Posts: 7,112
QuoteOriginally posted by gazonk Quote
The construction seems to be more complex than the 24-70/2.8, with one element more. That's quite a bit more complex than the 20-40 Ltd. I bet it's for the 645 system.
35-80/4 for 645? I doubt.

there are 28-45/4.5, 33-55/4.5 and 45-85/4.5
new standard zoom in roadmap is approx.45-90...
06-01-2016, 03:22 AM   #30
Senior Member




Join Date: Jul 2008
Posts: 102
QuoteOriginally posted by LaurenOE Quote
Very cool. A coherent f/4 strategy would work wonderfully with the K1.
As far as I know fixed-aperture zoom lenses close down the aperture a bit the wider the focal length is, to maintain the same maximum aperture across the zoom range. Personally I don't see the benefit of this and would much rather get the true maximum aperture at all focal lengths. If instead of f/4.0 it's f/2.5 at the wide end and only f/4.0 at the long end, I'm willing to accept it ;-)
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!
f/4, f/4 full frame, files a patent, frame, patent, pentax, pentax 35-80mm f/4, pentax news, pentax rumors, ricoh, ricoh files
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Nikon files patent for mirrorless full frame lens neostyles Non-Pentax Cameras: Canon, Nikon, etc. 2 12-18-2014 07:21 PM
Nikon Patent for Full Frame Mirrorless Lens Winder Non-Pentax Cameras: Canon, Nikon, etc. 3 12-16-2014 06:49 PM
ricoh files patent on 2 Q lens designs and on 4/3 design! shaolen Pentax News and Rumors 20 08-21-2014 12:03 AM
Tamron patent for a 15-50mm f/1.4 lens? Phil A Pentax Q 2 04-17-2014 08:07 PM
Pentax files a patent for a DA*25-350mm F3.3-5.6ED [IF] SDM lens grandnax Pentax News and Rumors 50 01-25-2011 08:57 AM



All times are GMT -7. The time now is 11:52 PM. | See also: NikonForums.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