Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
09-01-2011, 03:24 PM   #1
Veteran Member
minahasa's Avatar

Join Date: Jan 2011
Location: Minahasa, North Celebes (Sulawesi)
Photos: Albums
Posts: 585
Pentacon 135mm F2.8 ~ 15 blades = BOKEH MONSTER ~ 6 blades = NOT ?

Okay, I never really in to the 'soft' tone of European glass, but I'm thinking of getting at least one lens. As usual, I'll go price/performance on this, not thinking about breaking my piggybank on Zeiss or Leica. Pentacon 135/2.8, it seems to have quite good reputation, still priced reasonably, and I love bokeh, that's why I'm on to this. I do however can't decide on getting the newer 6 blades with better coatings, or the older 15 blades. Any suggestions (with samples, I hope)?

09-01-2011, 04:35 PM   #2
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
I love multi-blade presets -- 12 to 18 iris blades are a real turn-on for me. Older coatings can be finessed with a good lens hood. I've been lusting after this Pentacon for awhile. If you don't want it, I'll take it!
09-01-2011, 06:00 PM   #3
Veteran Member
Philoslothical's Avatar

Join Date: May 2011
Posts: 1,796
One way to experiment cheaply with more interesting bokeh is to pick up a cheap Helios lens. They're well known for their "twisty" bokeh, and it's quite an appealing effect.

For lenses with a large number of blades you could also try one by Panagor, Spiratone or Accura. I have one of the latter in the mail, 16 blades, and I'm looking forward to seeing what it can do. AFAIK (and double check this on the Panagor), these companies all made a ~16 blade 135mm f./2.8 lens.
09-01-2011, 06:26 PM   #4
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 16,136
One of the things to consider when deciding between presets and newer lower blade count aperture lenses is that not only is the shape and bokeh different due to the geometric pattern of the aperture but the aperture is located In a different place in the light path. These two changes were necessary to reduce the distance of the linkage but also to reduce the mass and friction, thereby permitting automatic aperture.

So while coatings on newer lenses will be better the bokeh will be considerably different. If you are looking for bokeh go for the preset and manage the light for dealing with the poorer performing coatings


  • 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!
blades, bokeh, bokeh monster, k-mount, pentacon, pentacon 135mm f2.8, 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
Pentacon 135mm IQ and bokeh. (image included) Pentaxor Pentax SLR Lens Discussion 2 03-30-2010 11:34 PM
Meyer 135mm f/2.8 Orestor (M42) aka the Bokeh Monster Asahiflex Post Your Photos! 4 10-26-2009 04:59 PM
For Sale - Sold: Soviet Tair-11A 135mm/2.8 Screw Mount M42 ( 20 Aperture Blades! ) arpaagent Sold Items 6 03-26-2009 05:23 AM

All times are GMT -7. The time now is 01:11 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]