Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-27-2013, 05:59 AM   #16
Pentaxian




Join Date: Mar 2010
Location: Manila, Philippines
Posts: 1,084
I believe that Pentax users are mostly smart buyers (if not frugal), dumping lenses for just new coating designs would be very lucrative, and to quote Asahiflex " ... if the price would be higher than the MSRP of the current limiteds"

08-27-2013, 06:29 AM   #17
Pentaxian
JinDesu's Avatar

Join Date: Jun 2011
Location: New York City
Photos: Gallery
Posts: 5,626
I would get them... because I broke my DA 21 F3.2's AF
08-27-2013, 06:36 AM   #18
Veteran Member




Join Date: Oct 2012
Location: Lietuva, Vilnius
Posts: 627
HD coating reduces reflections by 50%.

Doesn't that mean, that the lens transmit 50% more light? For example, if 21Ltd has a T number of 3.5 (according to DxO), with the new coating it should have a T number of 3.35?

I hope I got something wrong, because it is really a very small upgrade.

Last edited by Apapukas; 08-27-2013 at 06:42 AM.
08-27-2013, 06:40 AM   #19
Site Supporter




Join Date: May 2012
Location: Adelaide
Photos: Gallery | Albums
Posts: 1,104
I would think that if, say the Smc coating had 2% loss of transmission implying 98% transmission, the the Hd coating would have 1% loss, ie 99% transmission.

08-27-2013, 06:41 AM   #20
Pentaxian




Join Date: Apr 2007
Location: Romania
Posts: 9,330
No, because reflections aren't 100% to begin with.
The 70mm is on the list.
08-27-2013, 06:46 AM   #21
Pentaxian
gazonk's Avatar

Join Date: Feb 2009
Location: Oslo area, Norway
Photos: Gallery | Albums
Posts: 3,512
Hey, I just bought the 15mm! But I wonder how it's possible to reduce flare on that lens when there's almost nothing to begin with?

(...and will the rounded aperture blade destroy the nice starburst effect?)
08-27-2013, 06:47 AM   #22
Veteran Member




Join Date: Oct 2012
Location: Lietuva, Vilnius
Posts: 627
So the upgraded lens shouldn't transmit any more light, but it might have a better color rendition and resolution?

* HD stands for High Definition, and signifies the lensís capacity to reproduce images that excel in transparency, definition, resolution and rendition.
08-27-2013, 06:49 AM   #23
Veteran Member
Asahiflex's Avatar

Join Date: Jan 2008
Location: Netherlands
Photos: Gallery
Posts: 2,754
QuoteOriginally posted by Apapukas Quote
So the upgraded lens shouldn't transmit any more light, but it might have a better color rendition and resolution?

* HD stands for High Definition, and signifies the lensís capacity to reproduce images that excel in transparency, definition, resolution and rendition.
That's typical marketing babble which means nothing at all. All lens designers say the same.

08-27-2013, 06:49 AM   #24
Pentaxian
Fogel70's Avatar

Join Date: Sep 2009
Location: Stockholm, Sweden
Photos: Albums
Posts: 1,748
QuoteOriginally posted by southlander Quote
I would think that if, say the Smc coating had 2% loss of transmission implying 98% transmission, the the Hd coating would have 1% loss, ie 99% transmission.
But the SMC loss is 0.2% (or maybe even less on the latest generation), so going from 99.8% to 99.9% won't make that much difference.
08-27-2013, 06:52 AM   #25
Pentaxian




Join Date: Nov 2007
Location: Western Canada
Posts: 4,097
QuoteOriginally posted by Fogel70 Quote
Always something. but I don't like that they changed the colour to red on the ring. Reminds me too much of Canon L lenses.
I agree. Red is Canon L.

I have the 40 and 70 Limited lenses ...I like the green...'Pentax' green in my view.
08-27-2013, 06:54 AM   #26
Pentaxian
Clavius's Avatar

Join Date: Feb 2011
Location: De Klundert
Photos: Gallery
Posts: 4,122
So that HD DA 15 ltd will be even more resistant to flare then the SMC DA 15 ltd! Dang, I just bought the latter a few months ago.
08-27-2013, 06:58 AM   #27
Site Supporter
vagrant10's Avatar

Join Date: May 2007
Location: portland
Photos: Albums
Posts: 1,361
Any improvement is a welcome one. If bokeh is improved while being less prone to flare, fringing, or whatever, that's a good thing. Proof will be in the pudding though, so I'll withhold judgement until some tests are done.

What if Pentax added HD coatings and rounded blades to the the 31 43 and 77? OOOOohhhhh that would be nice! And expensive!!
08-27-2013, 07:00 AM   #28
Veteran Member




Join Date: Oct 2007
Location: France
Photos: Albums
Posts: 804
It means 2 times less flare. 2 % of reflection seems low, but it has to be multiplied by the number of air/glass interfaces, if you have 5 groups of elements, typically 5 * 2 = 10 % of light is reflected, and a part of it goes back to the sensor.
I agree that rounded blades will suppress starlight effects on the DA15... which is already really flare resistant. HD coating would be more appropriate with fast, complex zooms really prone to flare (ie the 12-24; but there is a replacement on the roadmap...)
08-27-2013, 07:01 AM   #29
Veteran Member
Docrwm's Avatar

Join Date: Sep 2010
Location: Somewhere in the Southern US
Photos: Gallery | Albums
Posts: 11,275
K-30 becomes K-50
DA Limiteds with SMC become DA Limiteds with HD

Where is the new stuff?
08-27-2013, 07:04 AM   #30
Pentaxian




Join Date: Nov 2011
Photos: Gallery | Albums
Posts: 3,735
QuoteOriginally posted by Fogel70 Quote
going from 99.8% to 99.9% won't make that much difference.
The improvement should be more apparent on the DA 15 and DA 35 Limiteds,
since they have more lens element groups.
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!
da, f2.8, hd, lenses, pentax, pentax news, pentax rumors, silver, versions
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Pentax FA 31mm f/1.8 Limited (black), Sigma UV HD 58mm CWyatt Sold Items 3 05-11-2013 10:57 PM
For Sale - Sold: DA Limited 21mm / DA Limited 35mm Macro / DA Limited 70mm top-quark Sold Items 3 04-23-2013 05:01 AM
For Sale - Sold: SMCP Pentax-DA 15mm F/4 ED AL Limited and SMCP Pentax-DA 70mm f/2.4 Limited Lenses Yosemite Sold Items 3 04-02-2013 05:29 PM
UV filters for DA limited lenses top-quark Pentax SLR Lens Discussion 8 04-25-2012 06:34 AM
For Sale - Sold: [EU] Pentax system, K10d, lenses (DA, DA Limited, DA*, F, M, K, Tak), flash jensm Sold Items 24 02-04-2010 04:44 AM



All times are GMT -7. The time now is 06:16 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