Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-24-2016, 10:47 AM   #1
Veteran Member




Join Date: May 2011
Location: Big Island, Hawaii & Utah
Posts: 453
Question regarding older Pentax lenses on K1

I received my K1 day before yesterday. I picked up a couple of older Pentax lenses, an M 1.4 50mm and A 70-210 F4 zoom. When I mount these on the K1 the aperture is wide open and rotating the aperture ring does not change the setting. I'm guessing I need some type of adapter to allow me to manually change the aperture when mounted. Can someone provide the answer or tell me what I may be doing wrong. Thanks.

06-24-2016, 10:50 AM   #2
Site Supporter
Site Supporter
enoeske's Avatar

Join Date: Jul 2009
Location: Surprise, Az
Photos: Gallery
Posts: 2,133
QuoteOriginally posted by CDW Quote
I received my K1 day before yesterday. I picked up a couple of older Pentax lenses, an M 1.4 50mm and A 70-210 F4 zoom. When I mount these on the K1 the aperture is wide open and rotating the aperture ring does not change the setting. I'm guessing I need some type of adapter to allow me to manually change the aperture when mounted. Can someone provide the answer or tell me what I may be doing wrong. Thanks.
Its doesn't stop the aperture down until you take the photo.
06-24-2016, 11:04 AM   #3
Pentaxian
Stone G.'s Avatar

Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,516
And first of all: Make sure that you have set "Aperture Ring Permitted" in the Custom Menu Settings.
06-24-2016, 11:06 AM   #4
Site Supporter
Site Supporter
paulh's Avatar

Join Date: Sep 2010
Location: DFW Texas/Ventura County, CA
Photos: Gallery | Albums
Posts: 23,997
https://www.pentaxforums.com/forums/58-troubleshooting-beginner-help/110658-u...x-dslrs-f.html

06-24-2016, 11:12 AM   #5
Loyal Site Supporter
Loyal Site Supporter




Join Date: Mar 2015
Photos: Gallery | Albums
Posts: 6,370
This should almost be a sticky at the top of the K-1 forum!
06-24-2016, 11:22 AM   #6
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 49,777
QuoteOriginally posted by CDW Quote
I received my K1 day before yesterday. I picked up a couple of older Pentax lenses, an M 1.4 50mm and A 70-210 F4 zoom. When I mount these on the K1 the aperture is wide open and rotating the aperture ring does not change the setting. I'm guessing I need some type of adapter to allow me to manually change the aperture when mounted. Can someone provide the answer or tell me what I may be doing wrong. Thanks.
For the A lens, just leave the aperture ring set to "A" and expose as you normally would.

For the M lens, you have to stop-down meter in M mode to get an exposure reading. Instructions can be found here:

https://www.pentaxforums.com/forums/54-pentax-lens-articles/110657-how-use-me...k-x-k-7-a.html

In both cases, since K mount lens diaphragms are automatic, the aperture only stops down at the time of image capture (and when you press the green button).

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, 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:

06-24-2016, 01:02 PM   #7
CDW
Veteran Member




Join Date: May 2011
Location: Big Island, Hawaii & Utah
Posts: 453
Original Poster
Thanks everyone. I did remember from my K5 days to go into the menu and change the Aperture Ring Permitted setting to allow. So now, no problem with the 70-210. However, the 50 1.4 has no A setting on the A ring. When I mount the lens on the camera, in M mode, the aperture changes to wide open 1.4 and turning the aperture ring has no effect. When I press the shutter release there is no change in the aperture. I see F-- in the viewfinder. Sorry to be so dense about this, what have I missed?
06-24-2016, 01:04 PM   #8
Site Supporter
Site Supporter
enoeske's Avatar

Join Date: Jul 2009
Location: Surprise, Az
Photos: Gallery
Posts: 2,133
QuoteOriginally posted by CDW Quote
what have I missed?
this post



06-24-2016, 01:07 PM   #9
Pentaxian




Join Date: Feb 2013
Posts: 1,187
QuoteOriginally posted by CDW Quote
Sorry to be so dense about this, what have I missed?
think you just have to push the green button (metering) and then fire away..
06-24-2016, 01:29 PM   #10
CDW
Veteran Member




Join Date: May 2011
Location: Big Island, Hawaii & Utah
Posts: 453
Original Poster
Thanks again, I was looking for the green button and stupidly ignored the green dot. All is well.
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!
aperture, change, k-mount, k1, lenses, pentax, pentax lens, pentax lenses, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Regarding the new Pentax K1 benjikan Pentax Full Frame 11 12-11-2015 03:42 PM
A question about older Pentax lenses on a DSLR. Dewman Troubleshooting and Beginner Help 9 05-16-2012 03:48 PM
Question regarding on Pentax K-7. =) richard balonglong Pentax DSLR Discussion 11 07-24-2011 05:24 PM
Question on older (manual focus) Pentax lenses Duck Dodgers Pentax SLR Lens Discussion 4 05-21-2009 11:05 AM
Metering Question On Older Lenses metroeloise Pentax SLR Lens Discussion 3 02-21-2009 08:34 PM



All times are GMT -7. The time now is 11:08 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