Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-06-2013, 08:00 AM   #1
Pentaxian




Join Date: Jan 2012
Location: Tokyo
Photos: Gallery
Posts: 1,184
DA21 - Crude SMC vs. HD comparison

Since the HD Pentax Limited lenses are now in the shops in Japan, I was able to bring my own SMC DA21 and take a comparison shot with the two lenses. It didn't go quite according to plan, because I got nervous under the beady eyes of about four shop assistants and rushed the job. I ended up with shots that were not framed exactly the same and focused on different points. I thought I'd share my observations about the lens and the samples anyway.

On the top is the green-striped SMC lens and underneath is the red-striped HD lens. Both at f3.2, 1/100, ISO200, AWB, JPEG Natural. Since I'm posting these crops one above the other, please be aware of any colour shift in your monitor.





The whole frame side by side - SMC on left, HD on right. I was trying to focus on the P of the black and white Pentax sign, but the SMC shot is focused considerable further back.



Observations
- There is no strange magenta colour cast coming from the HD coating as far as I can see.
- HD produced an overall darker image at the same settings.
- SMC shows noticeably more yellow chromatic aberration in the fluorescent lighting, especially to the left of the column with the Pentax sign. HD still has some CA, but you have to look closer.
- I can't see any difference in build quality. The focus ring feels the same.
- I used a K-01 with the latest firmware and the old and new lenses focused the same - same speed, same noise.

I don't think the difference is huge, but it's certainly there.

10-06-2013, 08:33 AM   #2
Pentaxian
aurele's Avatar

Join Date: Jan 2011
Location: Paris, France
Photos: Albums
Posts: 2,906
i don't want to be the annoying guy, but you should have used some preset White balance instead of Auto, so the difference in color cast for exemple would have been more visible, i guess.

Otherwise i wonder why the HD did produce a darker frame.

Thanks for the other info about lens construction
10-06-2013, 09:01 AM   #3
Pentaxian
JimmyDranox's Avatar

Join Date: Oct 2012
Location: Ploiesti, Romania
Photos: Gallery | Albums
Posts: 1,585
The diference in coatings can make diference in exposure time. But the exposure times are in steps, so, a little more light to the sensor can make the camera to set a little too short exposure, so, in this way, HD lens can produce darker frames.
10-06-2013, 09:14 AM   #4
Pentaxian




Join Date: Nov 2008
Location: Bangalore
Photos: Gallery
Posts: 2,435
As I was reading somewhere, no more starbursts on DA 15 with the new HD coating. Have you noticed something similar?


Last edited by yusuf; 10-06-2013 at 09:20 AM.
10-06-2013, 09:33 AM   #5
Site Supporter




Join Date: Jul 2009
Location: Mount Joy, PA
Photos: Gallery | Albums
Posts: 528
QuoteOriginally posted by yusuf Quote
As I was reading somewhere, no more starbursts on DA 15 with the new HD coating. Have you noticed something similar?
An interesting question, as the new HD versions all have rounded aperture blades. I rarely go for this effect, so I haven't bothered to experiment with lenses that have the rounded blades. Can anyone comment on this phenomenon?
10-06-2013, 09:39 AM   #6
Pentaxian
JinDesu's Avatar

Join Date: Jun 2011
Location: New York City
Photos: Gallery
Posts: 5,624
No, the new HD 15 does not have rounded blades.
10-06-2013, 09:58 AM   #7
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,947
QuoteOriginally posted by LowVoltage Quote
An interesting question, as the new HD versions all have rounded aperture blades. I rarely go for this effect, so I haven't bothered to experiment with lenses that have the rounded blades. Can anyone comment on this phenomenon?
I don't think any conclusions can be drawn from this as one SMC versions seems to not have focused properly. The best way to test out the new coating, if you have a chance, would be to shoot a photo with direct sunlight or a night photo with a bunch of light sources (or even a full moon).

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

10-06-2013, 10:30 AM   #8
Pentaxian
kh1234567890's Avatar

Join Date: Sep 2010
Location: Manchester, UK
Photos: Gallery
Posts: 2,327
QuoteOriginally posted by LowVoltage Quote
An interesting question, as the new HD versions all have rounded aperture blades. I rarely go for this effect, so I haven't bothered to experiment with lenses that have the rounded blades. Can anyone comment on this phenomenon?
To get starbursts you usually need to stop the lens right down. OTOH curved aperture blades are used to make the aperture more circular when nearly wide open. In practice it will probably make little difference to starbursts or bokeh - the real reason is marketing, since some Canikon lenses have them.

Nice quick comparison - so is HD worth the extra money ?

10-07-2013, 04:45 AM   #9
Site Supporter




Join Date: Aug 2010
Posts: 151
Thanks for the comparison!

And I'm still undecided...
10-07-2013, 05:22 AM   #10
Pentaxian
bdery's Avatar

Join Date: Mar 2008
Location: Quebec city, Canada
Photos: Gallery
Posts: 5,654
QuoteOriginally posted by kh1234567890 Quote
To get starbursts you usually need to stop the lens right down.
Not really, no. I usually shoot my DA21 quite wide, and get nice starburst effects. For instance, f5,6



QuoteOriginally posted by kh1234567890 Quote
curved aperture blades are used to make the aperture more circular when nearly wide open. In practice it will probably make little difference to starbursts or bokeh
Rounded apertures are NOT a gimmick. They will decrease the starbust effect but improve thye texture of the bokeh. Here's what you get when you don't have them:

10-07-2013, 11:41 AM   #11
Site Supporter




Join Date: Jul 2009
Location: Mount Joy, PA
Photos: Gallery | Albums
Posts: 528
QuoteOriginally posted by JinDesu Quote
No, the new HD 15 does not have rounded blades.
Really? Then somebody should change the PF Pentax Lens database entry!
10-08-2013, 03:02 AM   #12
Veteran Member




Join Date: Oct 2011
Posts: 818
I really think they shouldn't have changed the DA15 to rounded blades.... Sure, add more blades for more star trails but not the rounded blades...

Maybe every lens except DA15 and DA21..

Heck! Slap in an odd-numbered NON-rounded aperture blades into the DA14/2.8 to give it some life!

Rounded blades are mostly for smoother bokeh... Seriously, a wide angle used for bokeh? LoL!
I know it's doable but isn't the common usage for wide angles or super wides more for scenery? And they had to kill the starburst considerably..
10-08-2013, 03:48 AM   #13
Site Supporter
vjacesslav's Avatar

Join Date: Apr 2009
Location: Košice, Czechoslovakia, Europe Union
Photos: Gallery
Posts: 366
Here is the thing...
New HD DA 15mm Ltd has smart design of aperture blades... From round to classic one... When the lens is fully open, the blades are round at the end, so the effect is takin pictures with smooth bokeh...
When You stop down, specially for night shoots with stars F8 and more, the blades are not round all, so the hole od aperture si not rounded and it is more like on classic SMC HD 15mm, so the "stars" are back...
10-08-2013, 06:48 AM   #14
Veteran Member
Andi Lo's Avatar

Join Date: Jul 2008
Location: Halifax, Nova Scotia
Posts: 2,925
QuoteOriginally posted by vjacesslav Quote
Here is the thing...
New HD DA 15mm Ltd has smart design of aperture blades... From round to classic one... When the lens is fully open, the blades are round at the end, so the effect is takin pictures with smooth bokeh...
When You stop down, specially for night shoots with stars F8 and more, the blades are not round all, so the hole od aperture si not rounded and it is more like on classic SMC HD 15mm, so the "stars" are back...
So smart... Bravo Ricoh
10-09-2013, 02:34 AM   #15
Senior Member
topace's Avatar

Join Date: Sep 2011
Location: Stockholm
Posts: 196
QuoteOriginally posted by vjacesslav Quote
Here is the thing...
New HD DA 15mm Ltd has smart design of aperture blades... From round to classic one... When the lens is fully open, the blades are round at the end, so the effect is takin pictures with smooth bokeh...
When You stop down, specially for night shoots with stars F8 and more, the blades are not round all, so the hole od aperture si not rounded and it is more like on classic SMC HD 15mm, so the "stars" are back...
On most lenses I've seen, when the aperture is fully open, it receeds behind a circular ring, making very round bokeh circles. Is that not the case with the 15mm Ltd?
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!
colour, focus, hd, k-mount, lens, lenses, pentax, pentax lens, shot, sign, slr lens, smc
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
HD DA vs SMC DA beachgardener Pentax SLR Lens Discussion 9 10-18-2013 11:00 AM
Unscientific Comparison: K5 vs. 5DII vs. D600 sb in ak Non-Pentax Cameras: Canon, Nikon, etc. 36 12-27-2012 01:13 PM
FA*24 vs DA21 chesebert Pentax SLR Lens Discussion 5 07-13-2012 07:52 AM
Camera comparison: One X vs Galaxy S II vs Nexus vs N8 vs iPhone 4S jogiba Non-Pentax Cameras: Canon, Nikon, etc. 3 04-12-2012 07:41 AM
SMC K24 vs DA21 - opinions please axl Pentax SLR Lens Discussion 14 12-26-2009 04:51 PM



All times are GMT -7. The time now is 03:40 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