Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-24-2013, 08:22 AM   #16
Forum Member




Join Date: Nov 2011
Location: Upper Arlington, OH
Photos: Gallery | Albums
Posts: 82
Original Poster
QuoteOriginally posted by Ikarus Quote
I have a few lenses that are definitely not wide open when they claim to be
Ah, I see. Is there any way to tell this other than visually checking the aperture blades?

07-24-2013, 01:58 PM   #17
Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 26,632
QuoteOriginally posted by StevePrime Quote
Also, the longer focal length widens the DOF as well.
I think it is the other way around if the distance to subject is the same. However, for the same final magnification and f/stop focal length should not make a difference.

As for lenses not being fully open...for lenses with an aperture ring, I would expect that full-open should be full-open. At least that is true for everything on my shelf, including the Helios 44M.


Steve
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!
44m, auto, helios, k-mount, lenses, pentax, pentax lens, shot, slr lens, super-takumar, tak
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax 645 FA 45-85 wide open psychoanalyst Pentax Medium Format 6 08-31-2012 06:29 PM
Misc Some pics with Schneider 50/0.95 mostly wide open DanielT74 Post Your Photos! 5 03-31-2012 12:18 AM
Best K Mount between 24mm and 35mm f2 Wide Open Albino_BlacMan Pentax SLR Lens Discussion 17 03-07-2012 06:36 PM
Wide open aperture and the use of flash - getting ready for Christmas jpzk Flashes, Lighting, and Studio 24 01-28-2012 02:01 PM
FA77 and DA70 WIDE OPEN images: Let see 'em! maxwell1295 Pentax SLR Lens Discussion 31 05-20-2009 10:02 AM



All times are GMT -7. The time now is 10:24 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