Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-22-2007, 09:40 PM   #1
New Member




Join Date: Feb 2007
Location: Carnegie, Victoria, Australia
Posts: 6
An Answer to a question and a question.

Some people have been asking about using Pentax screw mount lenses on their *istDs; yes you can but you need the Pentax Mount Adapter K, mine has part number 30120, and it works fine with all my screwmount lenses, even a massive 300mm telephoto.
You CANNOT use DA lenses on film cameras as the images from these lenses are smaller than those of the screw mount lenses and DO NOT FILL THE 24x36
FRAME in the camera.:ugh:
Now my question: what is "BOKEH"? I just have not come across this term until recently, and I hate being ignorant of technical terminology. My dictionary doesn't help either.

02-22-2007, 09:45 PM   #2
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,958
Bokeh (pronounced boah-kay) is what we call the out-of-focus rendition of a lens. Generally, the smoother it is, the better.

Also, let me add that the DA 40mm pancake does work on 35mm film bodies because it's nearly identical to the M 40mm in optical design. None of the other lenses do, however

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:

02-22-2007, 09:58 PM   #3
Veteran Member




Join Date: Sep 2006
Location: Göteborg, Sweden
Posts: 810
QuoteOriginally posted by granitic Quote
-snip-
Now my question: what is "BOKEH"? I just have not come across this term until recently, and I hate being ignorant of technical terminology. My dictionary doesn't help either.
Bokeh can be used for short for "the quality of the rendering of the out of focus areas".

Examples:

"I think this picture has good bokeh" equals to "I think the quality of the rendering of the out of focus ares in this picture is good".

"Ouch, that's some harsh bokeh!" equals to "Yikes, the OOF areas in this picture are really rendered in an ugly way" (=bad bokeh obviously, meaning that the OOF areas are distracting and thus lessens the value of the picture as the subject gets less attention, the eyes are dragged away from what the real subject).

Thinking of bokeh this way let's you avoid traps. "What a lot of bokeh" or "Is this bokeh?" or "Bokeh example:" are all examples of a slightly wrong way to use the word.

A lens capable of rendering the OOF areas nice and smooth can be said to have good bokeh. This is often the same as rendering the OOF areas in a way that lets the beholder look at the picture and not think much about anything else in it but the subject, a picture with one technical flaw less.

All this in my humble opinion only of course.
02-23-2007, 02:02 AM   #4
Pentaxian
Arpe's Avatar

Join Date: Sep 2006
Location: New Zealand
Photos: Gallery | Albums
Posts: 4,331
So in a lens, are more aperture blades better or is less better (given that sometimes less is more )

02-23-2007, 03:24 AM   #5
Veteran Member




Join Date: Sep 2006
Location: Virginia Beach VA USA
Photos: Gallery
Posts: 1,364
Generally speaking, more aperture blades will generate smoother bokeh. Lesser blades tend to show more of an octagonal pattern.
02-23-2007, 09:28 AM   #6
Veteran Member
Alvin's Avatar

Join Date: Dec 2006
Location: Mississauga, Ontario, Canada
Photos: Gallery
Posts: 2,530
QuoteOriginally posted by roscot Quote
Generally speaking, more aperture blades will generate smoother bokeh. Lesser blades tend to show more of an octagonal pattern.
Or a hexagonal pattern.

To the OP - since the guys posted what bokeh is, you might want to see some. The 50mm lenses were known to produce some really good samples. Here's the thread I opened asking people here to post some up.

https://www.pentaxforums.com/forums/post-your-photos/3260-show-me-some-m-50-1-7-1-4-shots.html

Cheers!
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!
camera, dslr, lenses, pentax, photography, question, screw
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Answer this question: Why Do You Love Photography? hockmasm Photographic Technique 61 07-01-2011 04:48 AM
Stupid question. Looking for stupid answer. dws1117 General Talk 22 11-05-2008 09:51 AM
another answer to another teleconverter question cwood Pentax SLR Lens Discussion 9 10-01-2008 03:38 PM
Answer to Macro Question. Peter Zack Troubleshooting and Beginner Help 20 08-03-2008 07:32 AM
Answer This Question, Please. NLAlston Pentax SLR Lens Discussion 23 03-03-2007 05:54 AM



All times are GMT -7. The time now is 06:42 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