Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-19-2018, 06:27 PM   #1
Sabrina
Guest




I'm unable to adjust the F stop please help!!!

I have a pentax camera and I'm able to everything except the F stop. It shows the F stop as __. Does anyone know how to fix this?

01-19-2018, 06:48 PM   #2
Loyal Site Supporter
Loyal Site Supporter
twilhelm's Avatar

Join Date: Feb 2009
Location: Florida
Photos: Gallery | Albums
Posts: 2,369
What camera and lens? It could be dirty contacts between the two (an erasure or cotton tip with a little isopropyl alcohol works). Or it could be an older lens that won’t transmit data to the camera.
01-19-2018, 06:51 PM   #3
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 51,558
QuoteOriginally posted by Sabrina Quote
I have a pentax camera and I'm able to everything except the F stop. It shows the F stop as __. Does anyone know how to fix this?
If your lens has an "A" on the aperture ring, set it to "A".

If your lens has no aperture ring, see above.

If your lens is manual, see below:

How to use/meter Manual & M42 Lenses on all Pentax DSLRs (K-1, K-3, K-5, K-30, etc) - PentaxForums.com

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:
01-19-2018, 07:28 PM   #4
Otis Memorial Pentaxian
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 42,007
QuoteOriginally posted by First Poster Quote
It shows the F stop as __.
What this means is that the camera does not detect a lens with electrical contacts on the base and is unable to control the aperture* as a result. The causes include:
  • The lens does not have the required contacts for body-controlled aperture. With such lenses, one must set the aperture manually using the ring on the lens.
  • The lens may have the contacts, but the aperture ring is not in the "A" position. On most, this means pushing a small button on the side of the aperture ring to allow it to slip into this position. (Lenses without aperture rings should always be detectable.)
  • The contacts on lens and/or body might be fouled (dirty) and unable to properly conduct electricity. In that case a light buffing with a clean microfiber cloth is usually enough to get them clean.
As noted above, lenses without the "A" contacts on the base are still usable, but require special attention if one wants to use the built-in meter.


Steve

* The f-number on the LCD display is the setting to be applied, not the setting as detected.

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
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
People Need help adjust portraits, please julbelle Photo Critique 14 09-25-2014 02:53 PM
KX F-stop will not adjust!!! Rant big time. Tarag1 Visitors' Center 14 04-11-2014 08:23 PM
F-STop --- How do adjust it??? mikedmc Pentax K-r 8 11-29-2012 10:05 AM
K10D GX10 CCD Position Adjust (AF adjust) kevbirder Pentax DSLR Discussion 10 09-22-2011 02:35 PM
Question: How to adjust focus stop on 3M 5CA 500mm mirror lens GibbyTheMole Pentax SLR Lens Discussion 2 06-07-2011 07:35 AM



All times are GMT -7. The time now is 11:58 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