Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-26-2010, 01:50 AM   #1
Forum Member

Join Date: Jul 2008
Location: tokyo
Posts: 83
Is this bokeh ok for 77ltd

Recently bought an fa 77 ltd and it would be much appreciated if someone could give me their opinion on these examples of bokeh. Please tell me if I am imagining it but is there a spot in the middle of the shapes in the bokeh and if it is normal.

Images about 100% crops all taken at f1.8

05-26-2010, 02:02 AM   #2
Site Supporter
Site Supporter
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 10,143
yeah that is pretty typical of the FA77; unlike some lenses out there it's coma is most apparent at a distance with the aperture approaching f/1.8...though the practical upshot of this is at close focus it's coma is very well corrected: Meaning the OOF blur at wider apertures of portraits is typically rendered in a very uniform and smooth way*. The green/magenta outline seen on the fringes of highlights in the OOF portion of the images are another trait of the FA77. As I understand it, the DA77 has better control of these optical aberrations, but of course the DA70 is a stop or so slower**

*of course are situations where even a lens with theoretically perfect bokeh will stuff up, fast lenses like the FA77 need to be stopped down a bit for consistent bokeh f/4 is the sweet spot on this lens.

**It is a known fact that both lenses at f/2.4 the FA77 is typically 1/4th of a stop faster than the DA pancake.

Last edited by Digitalis; 05-26-2010 at 02:11 AM.
05-26-2010, 06:39 AM   #3
Forum Member

Join Date: Jul 2008
Location: tokyo
Posts: 83
Original Poster
Thanks for all the info. Coma? I'll google and see what I can find. Thought it was something I went into on a Friday night after a few beers.

Thanks again
05-26-2010, 07:47 AM   #4
Veteran Member
alexeyga's Avatar

Join Date: Dec 2008
Location: Montreal, Canada
Posts: 838
From my experience with the 77lim... it's best to avoid busy and really contrasty backgrounds...

05-26-2010, 07:51 AM   #5
Veteran Member

Join Date: Mar 2007
Location: Toronto (for now)
Posts: 1,746
This really is a super little lens but it's not as faultless and magical as people say it is. You really need to know it's strengths and weakness to produce those wonderfully rendered images you see on PPG or whatever.

I don't see how anyone rates it a 9 or 10 on the reviews on this site, the severe cyan fringing alone means it can't get top marks considering it's that creamy bokeh you're after when you buy this thing for $800.
05-26-2010, 08:50 AM   #6
Otis Memorial Pentaxian
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 38,020
Ummm...I fail to see the issue here...
  • Full resolution crops (aka 100% crop)
  • Wide open
  • Full sunlight
  • Distant specular highlights
When, pray tell, would bokeh be important for this sort of subject and when would the normal viewer be exposed to the full resolution crop?

Mind you, I understand the desire for an expensive lens to be "perfect", but a reality check is in order. I have a number of lenses of various ages, pedigree, and value and ALL show the following "faults" under certain circumstances:
  • Poor sharpness over all or part of the frame
  • Purple fringing on my K10D
  • "Busy" or harsh bokeh
  • Some degree of veiling flare
Out of the lenses that I own, the FA 77/1.8 is one of the more consistent performers along with the K 55/1.8, FA 35/2, Helios 44M 58/2, and Auto-Rikenon 50/1.7. It is definitely the most expensive lens I own, but I still consider it a good value compared to other options (Zeiss?) in the 70-90mm focal length range.

05-26-2010, 08:53 AM   #7
Site Supporter
Blue's Avatar

Join Date: Jun 2008
Location: Florida Hill Country
Photos: Gallery | Albums
Posts: 17,298
Sometimes that can be taken advantage of if its not overwhelming. I like to get the effect with small lights in evening & night shots. This was from the standard size white Christmas type lights shot just after sunset.


  • 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!
bokeh, k-mount, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Bokina versus Bokeh Monster, which bokeh you prefer? Pentaxor Pentax SLR Lens Discussion 3 04-21-2010 01:50 AM
Did my 77ltd just become a paperweight? kristoffon Pentax SLR Lens Discussion 11 09-14-2009 06:19 PM
First Pictures With My FA 77ltd Ari Post Your Photos! 2 09-08-2009 09:44 PM
why i love the 77ltd nostatic Pentax SLR Lens Discussion 0 03-27-2008 09:38 PM
A few with the new to me 77LTD :) vievetrick Post Your Photos! 8 11-13-2007 07:27 AM

All times are GMT -7. The time now is 12:54 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]