Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
02-01-2008, 02:01 PM   #1
New Member

Join Date: Feb 2008
Posts: 7
Please help with setting focal length etc


I have just brought the pentax k10d, and i have a couple of lenses for it, one is 50mm the other is 300mm. Whenever i attach the lens to the body 'F - -' appears on the top screen, but nothing on the main one. How do i set the focal length ? Whenever i go to the menu the "Shake reduction" option is greyed out. I can't take any pics with the cam.

Anyone know what i should do ? Do i need to be on a particular setting etc ?

thanks a lot !


02-02-2008, 02:01 PM   #2
Veteran Member
Finn's Avatar

Join Date: Feb 2007
Location: Phoenix
Photos: Gallery
Posts: 1,056
What lenses are they, specifically? It sounds like they are old manual lenses, which take a couple of extra steps to use effectively. I could repeat it all here, but others have said it better than I can. You might want to check back through the archives, and on the knowledge base.
02-02-2008, 02:43 PM   #3
Veteran Member
stewart_photo's Avatar

Join Date: Apr 2007
Location: Heidelberg, Germany
Posts: 1,864
QuoteOriginally posted by tomaplaw Quote
I have just brought the pentax k10d, and i have a couple of lenses for it, one is 50mm the other is 300mm. Whenever i attach the lens to the body 'F - -' appears on the top screen, (snip)

If the lens has an aperture ring, it must be set to the "A" setting.

02-02-2008, 03:05 PM   #4

Join Date: Apr 2007
Location: Sweden
Posts: 1,940
Sounds like an old manual lens with an apertue ring. If it is, then you have to change a setting in the camera, something like: "allow aperture ring". Then use manual mode, turn ring to wanted apertue, press green button. Then shoot. Also, be sure to have focus on manual.

02-02-2008, 04:20 PM   #5
New Member

Join Date: Jan 2008
Location: Cheshire UK
Photos: Gallery
Posts: 20
It's not the Focal length that's missing, it's the f-ratio.

Set the options to allow use of Aperture ring
Set the mode to Manual
Set the focus to Manual
Focus until you get the hexagon
Press the AE-L button to program the shutter speed
Take a photo
02-02-2008, 04:42 PM   #6
Veteran Member
Stratman's Avatar

Join Date: Mar 2007
Location: St Louis, Missouri U S A
Photos: Gallery | Albums
Posts: 2,464
if it is a fully manual lens, with no "A" on the aperture ring, you will not see the F stop in the viewfinder, those lenses have no contacts to relay that info to the camera.
02-02-2008, 05:10 PM   #7

Join Date: Oct 2006
Location: Woodinville, WA USA
Photos: Gallery
Posts: 1,175
Specfically - go to the custom settings menu.
Navigate to the item that says "using aperture ring" - default is off - turn it on per p.35
In my manual go to page 210 to read how to use this featrue --- the "F--" message will NEVER go away when using these lenses. The camera has no means to know what the aperture is - therefore the "F--" in the viewfinder and the EXIF information is blank also.

The Elitist - formerly known as PDL

  • 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, length, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
K10D - Setting Shake Reduction Focal Length With Manual Focus Lenses? stewart_photo Photographic Technique 30 07-28-2016 12:52 AM
Setting focal length with tele-converter chiggerbyt Troubleshooting and Beginner Help 2 02-04-2010 10:42 AM
setting focal length mc zenitar 16mm 2.8 fisheye lens into pentax k-x jheeno Troubleshooting and Beginner Help 2 01-05-2010 06:31 AM
What is Focal Length Ole Photography Articles 2 05-15-2009 12:20 PM
setting manual lens focal length on K20 boyscout Troubleshooting and Beginner Help 9 05-01-2009 08:55 AM

All times are GMT -7. The time now is 08:12 PM. | 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]