Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-22-2013, 07:50 PM   #16
Pentaxian
Driline's Avatar

Join Date: Dec 2012
Location: IOWA Where the Tall Corn Grows
Photos: Gallery
Posts: 2,973
Original Poster
QuoteOriginally posted by mattt Quote
I shoot it 2:1 at least... I find 15 so much wider that its hard to keep an uncluttered frame - I am still learning it though and I'm made some OK shots that keep me coming back to try it some more. I also have DA 12-24 which I should revisit as I've only been shooting since Jan 2011 - I feel I've learned a lot the last little while. Of course, I'm not retired, and my kids still live at home so my spare time is a precious commodity.
Sounds like me Do you think the Starbursts are as nice on the 21 as compared to the 15?

04-23-2013, 01:10 AM   #17
Veteran Member
steve1307's Avatar

Join Date: Mar 2010
Location: Sydney
Photos: Gallery | Albums
Posts: 1,129
"I think you need to get both"
is the obvious answer . Its been a day and can't believe no one said it yet.
04-23-2013, 03:24 AM   #18
Site Supporter
mattt's Avatar

Join Date: Feb 2011
Location: Niagara
Photos: Gallery | Albums
Posts: 2,806
QuoteOriginally posted by steve1307 Quote
"I think you need to get both"
is the obvious answer . Its been a day and can't believe no one said it yet.

It has been said by me... Twice.

Yes 21 will do starburst...

Had to go find a photo with starbursts... it seems I normally dont shoot 21 at night... must be the slower aperture creating a mental block.
Attached Images
 

Last edited by mattt; 04-23-2013 at 03:45 AM. Reason: added photo
04-23-2013, 03:38 AM   #19
Moderator PEG Judges
Kerrowdown's Avatar

Join Date: Aug 2008
Location: Highlands of Scotland.
Photos: Gallery
Posts: 32,701
QuoteOriginally posted by jatrax Quote
simply classic design!
No I'm sorry, classic design is the A series lenses.

04-23-2013, 03:44 AM   #20
Senior Member
mbukal's Avatar

Join Date: Jan 2011
Location: zagreb
Posts: 173


directly from the camera Pentax K30+Pentax smcF28/2,8 / jpeg /
Exposure time: 1 (1/1) sec.
aperture: f / 4
Focal Length: 28 mm
Exposure bias: 0.3333 EV
ISO sensitivity: 100

excellent / super lens that I really like but that is only one small flaw that can be seen in the photograph:

feature .......................... the 21st .................... F28 ...
Digital coatings ................. X. ............................. .. - .....



camera Pentax K30+Pentax smcF28/2,8
Exposure time: 0.0031 (1/320) sec.
aperture: f / 5
Focal Length: 28 mm
Exposure bias: 0 EV
ISO sensitivity: 200

Last edited by mbukal; 04-23-2013 at 03:56 AM.
04-23-2013, 05:10 AM   #21
Pentaxian
bdery's Avatar

Join Date: Mar 2008
Location: Quebec city, Canada
Photos: Gallery
Posts: 5,830
QuoteOriginally posted by Driline Quote
I'd like to know if the DA21 is as sharp or = to the F28.
Hi there! I tested the FA28 (similar to the F) and the DA21 extensively before deciding to keep the 21. Regarding sharpness they are close. The colours of the 21 are much more beautiful, more saturated, its bokeh is busier but I like it better. add the better construction, smaller size, quick-shift and you have a winner, I think.

Regarding the field of view I found them to be comparable, in the sense that a step back will deliver comparable FOVs.

QuoteOriginally posted by Driline Quote
Do you think the Starbursts are as nice on the 21 as compared to the 15?
I never used the 15 bt the starbursts from the 21 are the best in my experience. And I've tested quite a few lenses... It shines at cityscapes, nature, anything colourful.
04-23-2013, 06:41 AM   #22
Pentaxian
Jonathan Mac's Avatar

Join Date: Apr 2009
Location: Madrid, Spain
Posts: 4,344
21mm and 28mm are very different focal lengths, and you need to choose which is better for what you want to use it for.

I find the DA21 very useful with great IQ. It's an excellent focal length for parties and get-togethers: wide but not too wide.
04-23-2013, 02:52 PM   #23
MSM
Veteran Member
MSM's Avatar

Join Date: Dec 2007
Location: Alabama
Photos: Gallery
Posts: 994
QuoteOriginally posted by Driline Quote
Does anyone have experience comparing both these lenses first hand? Other than the obvious focal length?The F28 has a better user review at 9.39 vs 9.17 for the DA 21. The average price of the F28 is also less than half that of the DA21.
@Driline: I have used both. I had the F28. It is a nice lens as noted above. It is also very different than the 21 limited in FOV. I know you have been mulling this over. (I think you have had 1 or 2 other threads discussing the 21 mm) I will say that your combo for the 21/43 is a good one. I have the same. I think you will find the 28 and 43 too close if you plan on only going with 2 lenses. I recommend that you pick up a good used copy of the 21 mm ~$400 and if you don't like it after using it resell it here. If you buy the 28 you are going to be wondering what you're missing without the 21 mm. just a thought. I have been there so I know how you feel.

04-23-2013, 04:06 PM   #24
Pentaxian
Driline's Avatar

Join Date: Dec 2012
Location: IOWA Where the Tall Corn Grows
Photos: Gallery
Posts: 2,973
Original Poster
QuoteOriginally posted by MSM Quote
@Driline: I have used both. I had the F28. It is a nice lens as noted above. It is also very different than the 21 limited in FOV. I know you have been mulling this over. (I think you have had 1 or 2 other threads discussing the 21 mm) I will say that your combo for the 21/43 is a good one. I have the same. I think you will find the 28 and 43 too close if you plan on only going with 2 lenses. I recommend that you pick up a good used copy of the 21 mm ~$400 and if you don't like it after using it resell it here. If you buy the 28 you are going to be wondering what you're missing without the 21 mm. just a thought. I have been there so I know how you feel.
Thanks for the input. I am going to go with the DA21. I was mulling over the DA15 as well, but it's quite a bit wider and more expensive.
04-23-2013, 04:20 PM   #25
Veteran Member
NickLarsson's Avatar

Join Date: Feb 2012
Location: Paris, France
Photos: Gallery | Albums
Posts: 1,390
QuoteOriginally posted by Driline Quote
Thanks for the input. I am going to go with the DA21. I was mulling over the DA15 as well, but it's quite a bit wider and more expensive.
Good choice
04-24-2013, 06:24 AM   #26
Senior Member
Mr_Canuck's Avatar

Join Date: Jan 2011
Photos: Gallery
Posts: 293
DA21 is a great lens. Some are put off by f/3.2. Wish it could've been f/2 like the Fuji lens but engineering and physics got in the way. It's a very easy and usable focal length. Quality of image and construction, and the wicked cool hood, are unmatched.
04-24-2013, 10:51 AM   #27
Pentaxian




Join Date: Jan 2013
Location: Near Vienna, Austria
Photos: Gallery
Posts: 758
A somewhat late addition (only for dedicated pixel-peepers): this thread made me finally do a test I had been thinking about before. From earlier test shots, I had the impression that the corner performance of the DA 21 was not always so brilliant (don't get me wrong, I love that lens!). So I did a series of shots of my LP and CD shelves at an estimated distance of 2.40m, K-5 II at f/3.5 with focus bracketing. I found that the main reason for soft corners is a slight, but noticable field curvature (I assume this is the price we pay for the pancake construction). Interestingly it seems to get a little more pronounced when stopping down from 3.5 to 5.6.
Here are a few crops from the best shots, both with center and extreme corner at 100%. Not just as they come from the camera, but shot in raw and carefully sharpened to bring out what detail is really there (ACR 7.3, Photoshop CS6). But also not oversharpened (which is something I hate).

Softer center:




Sharper center:



Sharper corner:



Softer corner:



This is the whole frame:



In the center, the difference is minimal, but it's there. In the corners, it is more pronounced. In the sharper corner, although the overall contast suffers a little, the small letters produce a lot of pixel artefacts, evidence that resolution-wise the lens is outperforming the 16MP sensor even close to wide open.
I find that quite impressive.

BTW, I also used ACRs auto CA correction which is fine but not perfect. Inevitably, from all kinds of post CA correction, corner resolution is affected a little. Why raw and not "pure" .jpg? Using a fine camera and fine lens, I see no point in not trying to get all the IQ that my equipment can give me. Compare the details of an in-camera .jpg with the properly sharpened raw output, it's a world of difference (at least for dedicated pixel-peepers).
04-24-2013, 10:54 AM   #28
Pentaxian




Join Date: Jan 2013
Location: Near Vienna, Austria
Photos: Gallery
Posts: 758
Just one more info: to get the corners sharp, you must back-focus the center ever so slightly.
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!
da21, f28, k-mount, pentax, pentax da21, pentax lens, slr lens, vs
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
FA*24 vs DA21 chesebert Pentax SLR Lens Discussion 5 07-13-2012 07:52 AM
For Sale - Sold: Pentax 1.7x AF adapter, F28/2.8, F28-80/3.5-4.5, M50/1.7 (Worldwide) Seaside Sold Items 6 07-08-2011 12:57 AM
Wanted - Acquired: Pentax F28 2.8 Deimos Sold Items 2 04-10-2011 12:46 PM
Pentax DA21 vs Sigma 18, round two, GoForBroke! (lots of images) Gooshin Pentax SLR Lens Discussion 2 02-15-2008 10:54 AM
Sigma 18mm f2.8 vs Pentax DA21 f3.2 : pics/comments inside! Gooshin Pentax SLR Lens Discussion 21 02-09-2008 04:38 PM



All times are GMT -7. The time now is 10:41 PM. | 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