Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-31-2011, 11:32 AM   #1
New Member




Join Date: Jul 2011
Location: Bellevue, WA
Posts: 19
Bokeh at f/2.8: DA* 55mm vs. D-FA 50mm Macro

Between the DA* 55mm f/1.4 and the D-FA 50mm f/2.8 Macro, which has the better bokeh at f/2.8?

Do any 3rd-party AF lenses of approximately 50mm have better bokeh at f/2.8 than those two?

What about older Pentax AF 50mm macros -- the F & FA 50mm f/2.8 Macro?


Also -- The 70 pancake and the 77 Limited -- they're a bit long for what I'm looking for, but if their bokeh is vastly superior I'd consider them. How does their bokeh compare to the lenses I've asked about above?


Thanks,

Greg

12-31-2011, 12:18 PM   #2
Veteran Member
demp10's Avatar

Join Date: Jun 2011
Location: Atlanta
Photos: Albums
Posts: 602
Bokeh is not a single element that you can compare it from lens to lens. Bokeh is the collection of all out of focus parts in the image. These include uniform large areas that will look "fuzzy", linear features (wires, branches, etc) that will have additional thickness added, point sources (like light bulbs) that will turn into Christmas ornaments, irregular sharped objects (like leaves) that will become amorphous, parts of sky that shows through vegetation, and so on.

Each lens renders these elements in unique ways and one may provide a pleasing rendition of one and a distracting of another. It all depends on what you plan to photograph. It is quite different for a portrait against a uniform background, vs. a flower close up in the garden pointing down, vs. something that has sky peaking through vegetation in the background.

There are general criteria that suggest that lenses with more aperture blades (or rounded ones) produce better bokeh because highlights do not have angular features. The only way that can accurately say that lens A has better bokeh than lens B is when you use a particular image (or shooting situation) as a reference.
12-31-2011, 10:37 PM   #3
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
If you like it, it's good bokeh. If you don't like it, it's bad bokeh.

Most official 'good' bokeh is probably smooth enough that most viewers (who have never heard the word) won't notice it. I personally prefer contrary bokeh. If the subject is complicated, smooth bokeh is good. If the subject is large & smooth & bland, nervous bokeh may set it off. If the background is dark, and the subject is small and bright but irrelevant, the weird bokeh of specular lights can nicely pattern the picture.
01-01-2012, 06:38 AM   #4
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
The bokeh of the DA*55 is really holding me back to get it, i love the colours, the contrast and the rest of the lens but the bokeh can be bloody aweful sometims
I have no experience with the DFA50 but i'm looking now at the Sigma 50mm f/1.4, bokeh looks better at least but haven't looked too serious at it yet to say it's better overal.
The bokeh of the FA50 f/1.4 is so good as the same as the DA*55 so no use getting that one over it, don't know what more is left of modern lenses.

Carl zeiss 50mm maybe but what i've seen from it i just ain't sure about it, build qaulity is brilliant but the image quilty looks medicore.

01-01-2012, 12:00 PM   #5
Veteran Member
creampuff's Avatar

Join Date: May 2007
Location: Singapore
Photos: Gallery
Posts: 3,955
QuoteOriginally posted by Anvh Quote
The bokeh of the DA*55 is really holding me back to get it, i love the colours, the contrast and the rest of the lens but the bokeh can be bloody aweful sometims
I have no experience with the DFA50 but i'm looking now at the Sigma 50mm f/1.4, bokeh looks better at least but haven't looked too serious at it yet to say it's better overal.
The bokeh of the FA50 f/1.4 is so good as the same as the DA*55 so no use getting that one over it, don't know what more is left of modern lenses.

Carl zeiss 50mm maybe but what i've seen from it i just ain't sure about it, build qaulity is brilliant but the image quilty looks medicore.
How can you even make a determination that the bokeh of one lens is better than another when you don't even own the lenses or shot similar subjects to compare one with another?
To say the bokeh of the FA50 f/1.4 is so good as the same as the DA*55 is definitely stretching things.
01-01-2012, 12:26 PM   #6
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
Bokeh isn't something that changed when doing PP except when you really sharpen or blur a lot.
So by looking at photos from others you can easily see how the Bokeh comes out.
Also check the photos on photozine.de those are all edited the same way, off course the weather and things like that are a bit different between shots but you often can do a quite fair comparison with their photos.

And i did test the DA*55 on a Pentax meeting
It also focus really slow but for the rest its a nice lens though, it was on my wish list but not anymore.

As for the FA50 vs DA*55 comparison, someone did a very good review comparing those two together with some bokeh test and yes they are so good as the same, only real major differnce is the corener sharpness which is better with the DA*55,
Will try too look the test up for you.

edit:
Here you go
www.informatik.uni-bremen.de/foto-ag/DA55/DA55.html
QuoteQuote:
5. Bokeh: The Bokeh of the DA55 and the FA50 is almost identical. The circle of confusion looks like in most modern lenses today: A smooth Gaussian transition in the foreground and a bright border in the background ("over-corrected spherical aberration"). The bright border is a little stronger in the FA50.

ps. i really was hoping Pentax would gave the DA*55 a smooth bokeh because it was advertice as the FA*85 replacement for APS-C which is a classic focal length for portrait. The bokeh is just to busy for my taste and for portraits i believe but your miliage might differ.
Also really depends what you want to do with the lens off course.

Last edited by Anvh; 01-01-2012 at 12:45 PM.
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!
50mm, 55mm, af, bokeh, d-fa, da*, f/2.8, k-mount, lenses, macro, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Misc 100mm f/2.8 Macro WR Bokeh Bokeh Bokeh! iocchelli Post Your Photos! 3 03-20-2011 02:22 AM
For Sale - Sold: K100D + 18-55mm; 50-200mm; FA 50mm; Sears 135mm macro; Super-Takumar 50/1.4 (C kveldalf Sold Items 4 09-07-2010 10:13 PM
For Sale - Sold: K10D + grip + 18-55mm, DA 12-24mm, FA 50mm/1.7, D FA 50mm/2.8 macro (Worldwide dgaies Sold Items 6 07-17-2010 03:46 PM
For Sale - Sold: Pentax *ist DL, FA 50mm f/1.4, DFA 100mm f/2.8 macro, DA 18-55mm, A 50mm f/2.0 chemxaj Sold Items 14 05-31-2010 09:34 AM



All times are GMT -7. The time now is 08:48 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