Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-24-2014, 07:03 PM   #1
New Member




Join Date: Mar 2014
Posts: 21
Trouble adjusting aperture on k-x

Hi all,

I have a k-x and recently acquired the smc pentax-A 100mm f/4 macro.
(SMC Pentax-A 100mm F4 Macro Reviews - A Prime Lenses - Pentax Lens Reviews & Lens Database).

The trouble is-- There's no "A" setting on the lens to let me adjust the aperture when I'm shooting in Av and the body doesn't seem to be responsive when I manually adjust the aperture on the lens.

I'm sure I'm missing something silly. Can you point me in the right direction?

Thanks!
Danielle

03-24-2014, 07:09 PM   #2
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,770
Info here on using all manual lenses: https://www.pentaxforums.com/forums/58-pentax-beginners-corner-q/110658-using...x-dslrs-f.html Because like @Twitch says if there is no 'A' setting, then it's not an 'A' lens.
03-24-2014, 07:21 PM   #3
New Member




Join Date: Mar 2014
Posts: 21
Original Poster
Ah I feel so silly! It was described incorrectly when I purchased and I didn't even think to check before attaching it.
That's unfortunate...
03-24-2014, 07:45 PM   #4
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,182
The lens you have will still work just fine, but you just have to stop-down meter with it as per this guide:
https://www.pentaxforums.com/forums/54-pentax-lens-articles/110657-how-use-me...k-x-k-7-a.html

The only thing is that the camera won't know what the f stop value is.


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



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

03-24-2014, 07:47 PM   #5
Pentaxian
Just1MoreDave's Avatar

Join Date: Feb 2007
Location: Aurora, CO
Photos: Gallery | Albums
Posts: 4,862
Yes, unfortunate. It's probably worth tracking down the real A version. I like to use the 90-100mm length for all kinds of photos. The A version makes all that easier. The M version is the same optical formula, but the price and usability are much different.
03-24-2014, 08:53 PM   #6
New Member




Join Date: Mar 2014
Posts: 21
Original Poster
The seller did offer a refund, I believe it was a genuine mistake.
After playing with it a bit, I do like the lens and will probably keep it as it's still a good price for the M (relative to ebay, anyway).
QuoteOriginally posted by twitch Quote
If it was sold to you as an "A" version then you have good grounds to get your money back.
Thanks for the link, I've been meaning to read that article and now I have good reason.
QuoteOriginally posted by Adam Quote
The lens you have will still work just fine, but you just have to stop-down meter with it as per this guide:
https://www.pentaxforums.com/forums/54-pentax-lens-articles/110657-how-use-me...k-x-k-7-a.html

The only thing is that the camera won't know what the f stop value is.
Thanks all for your quick help!
04-04-2014, 10:08 AM   #7
New Member
thewebgal's Avatar

Join Date: Apr 2014
Location: Just a bit outside DC
Posts: 9
if I may ask a Q along the same lines - I just bought
Pentax SMC DA 18-55 mm F/3.5-5.6 II AL Lens

Its in the mail right now - so, I should expect it will have an A button to allow me to set Aperature?
04-04-2014, 10:18 AM - 1 Like   #8
Pentaxian




Join Date: Dec 2010
Location: Ontario
Photos: Gallery
Posts: 2,558
QuoteOriginally posted by thewebgal Quote
if I may ask a Q along the same lines - I just bought
Pentax SMC DA 18-55 mm F/3.5-5.6 II AL Lens

Its in the mail right now - so, I should expect it will have an A button to allow me to set Aperature?
Nope, no A-button on the lens, no aperture ring at all, nothing on the lens you need to set. The aperture is controlled from the camera either by you or the camera itself depending on the mode it's in (M, Av, Tv, etc). Just mount the lens and you're ready to go.

04-06-2014, 10:40 AM   #9
New Member
thewebgal's Avatar

Join Date: Apr 2014
Location: Just a bit outside DC
Posts: 9
QuoteOriginally posted by BrianR Quote
Nope, no A-button on the lens, no aperture ring at all, nothing on the lens you need to set. The aperture is controlled from the camera either by you or the camera itself depending on the mode it's in (M, Av, Tv, etc). Just mount the lens and you're ready to go.
Great - seems fine - thank you!
My old Quantray 85-300 K mount lens works, the old Soligor 35-70 K mount lens won't mount.
The old 50mm 1:2 ASAHI Pentax lens from my ME-Super mounts fine, of course.
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!
100mm, aperture, camera, k-x, lens, macro, pentax help, pentax-a, photography, reviews, smc, trouble
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Trouble changing aperture on k30 Shonnee79 Troubleshooting and Beginner Help 5 03-21-2014 12:54 AM
Adjusting the fine focus on K-x... GibbyTheMole Troubleshooting and Beginner Help 7 03-06-2014 10:32 AM
K-x aperture problem: always fully stopped down on DA lenses amrocha Troubleshooting and Beginner Help 4 11-03-2011 03:47 PM
No aperture reading on K-X HoBykoYan Troubleshooting and Beginner Help 4 05-30-2011 05:19 AM
Aperture settings via lens on K-x Gary G Pentax SLR Lens Discussion 5 11-16-2010 06:10 PM



All times are GMT -7. The time now is 09:47 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