Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-23-2010, 05:50 AM   #1
New Member




Join Date: Aug 2010
Location: Cleveland, Ohio
Posts: 1
can't get apertue to f 3.5

Hi, I'm very new at this dslr. I'm trying to figure out the difference in aperture settings taking pic as I change it. My lenses should go to 3.5 but the lowest it will let me go is 5.6.

I have a K-x with DAL 1: 3.5-5.6 18-55mm AL

Thanks in advance for the help!!!

Dina

08-23-2010, 05:57 AM   #2
Veteran Member
dgaies's Avatar

Join Date: Oct 2009
Location: Maryland / Washington DC
Posts: 3,917
QuoteOriginally posted by lilcoco Quote
My lenses should go to 3.5 but the lowest it will let me go is 5.6.
The lens will only go down to f/3.5 on the wide end of the zoom range (18mm). At the long end (55mm) you will not be able go lower than f/5.6.
08-23-2010, 06:09 AM   #3
Veteran Member




Join Date: May 2009
Location: Twin Cities, MN
Posts: 2,867
QuoteOriginally posted by dgaies Quote
The lens will only go down to f/3.5 on the wide end of the zoom range (18mm). At the long end (55mm) you will not be able go lower than f/5.6.
This is correct. When a lens has an F stop range designation of 3.5-5.6, that means that it is a variable aperture lens. depending on what focal length you set the lens to, its minimum aperture will change (as stated above, at 18mm it will go to f3.5, at 55mm it will be minimum f5.6).

To show yourself how this works, set the lens at 18mm, and using aperture priority mode change it to f3.5. Then, zoom the lens out to 55mm, and you can watch the aperture changing as you zoom out.
08-23-2010, 09:09 AM   #4
Inactive Account




Join Date: Aug 2008
Location: Michigan, USA
Photos: Gallery | Albums
Posts: 7,484
What the others have said.

If you want your aperture to remain constant throughout the zoom range, you'll need a different lens capable of doing so. Any of the f2.8 zooms will do. That, or set your aperture to f5.6 and then your aperture will stay constant on your kit zoom.



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, pentax help, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -7. The time now is 03:29 PM. | 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