Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-28-2012, 04:10 PM   #1
Veteran Member
ChooseAName's Avatar

Join Date: Aug 2009
Location: Southeast USA
Photos: Gallery | Albums
Posts: 390
Seemingly no difference between AF/MF

I have a K200D and just got a KatzEye screen today and installed it. So I was trying some manual focus and it's not quite working the way I thought it would. There doesn't seem to be any difference between MF and AF. When I set to MF, the camera will still autofocus, and when I turn the focus ring (on the FA 50/1.4), there's a lot of resistance and it sounds like I'm cranking the AF motor manually, the same sound you get when you turn the focusing ring in AF mode. I thought the focusing ring action was supposed to be low-resistance and smooth, like it is when I have the lens physically detached from the camera. I've tried with both of the lenses in my signature.

Am I doing something wrong? Or is my AF/MF button completely not working?

I have read the manual and searched the forums, so forgive me if this has been covered before. I think I'll refrain from manual focusing until I can be sure I'm not destroying my lenses.

Thanks.

06-28-2012, 04:17 PM   #2
Pentaxian
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,873
unfortunately, you may have done damage to the screw drive focus mechanism on the lens....
06-28-2012, 04:40 PM   #3
Veteran Member
ChooseAName's Avatar

Join Date: Aug 2009
Location: Southeast USA
Photos: Gallery | Albums
Posts: 390
Original Poster
If I had done damage to the screw drive focus mechanism, wouldn't AF not work properly either?

I don't think I'd used MF in 2.5 years, and that was with strictly MF lenses. A couple of weeks ago in anticipation of the KatzEye screen, I'd switched to MF and tried the focus ring and noticed then that it seemed to be cranking the screw drive.
06-28-2012, 04:45 PM - 1 Like   #4
Senior Member
pezmaker's Avatar

Join Date: Jul 2011
Location: Madison, WI
Photos: Gallery | Albums
Posts: 276
I have this exact issue with my K200d. Unfortunately when I went to pick up the camera one day a month or so ago, the strap caught on a stool, pulling the camera out of my hands. Unfortunately the camera swung down and struck the bottom of the stool. Fortunately, the only issue is that the AF/MF switch, while it does move, doesn't actually switch the camera out of AF. While searching for potential fixes (not like I really thought there would be), I noticed this seems to have happened to a few K200Ds out there.

06-29-2012, 03:25 AM - 1 Like   #5
Pentaxian
Mareket's Avatar

Join Date: Jun 2011
Location: Chester
Photos: Gallery | Albums
Posts: 719
Hold the quick-release button down (carefully, don't drop the lens!) and you'll be in MF mode

And for the record I did the same with my non-QS lenses a while back and I've never noticed any drop in screw-drive AF performance. Don't sweat it, but I wouldn't encourage it.
06-29-2012, 02:10 PM - 1 Like   #6
Loyal Site Supporter
pacerr's Avatar

Join Date: Jan 2008
Location: Henry, TN
Photos: Gallery | Albums
Posts: 2,850
Remove the lens. Look at the AF screw drive in the camera's lens mount ring as you select MF and AF with the body switch. In MF the screw should be retracted. If it's NOT, your AF switch isn't working properly and AF is mechanically engaged even though the switch is in manual.

If the screw drive IS retracted when in the MF position, any unusual condition must be in the lens itself. Compare the lens with other AF lenses.

Note: the AF indication (and beep) in the VF operates regardless of the MF/AF body switch position (although some effects may be deselected in the Menus).

H2
06-29-2012, 03:46 PM   #7
Veteran Member
ChooseAName's Avatar

Join Date: Aug 2009
Location: Southeast USA
Photos: Gallery | Albums
Posts: 390
Original Poster
Thanks everyone. When I set it to MF without a lens on, I don't see anything retract on the mount ring. When I press the lens release button with no lens on, I see two thingies retract. Consequently, the work-around that involves pressing the release button while manually focusing does work, although it's a bit of a hassle.

The question then is, should I press on with the KatzEye focusing screen, or should I return it? I do like that the VF is brighter, but I don't know if I would have been willing to pay $160 for just a brighter VF.
06-29-2012, 04:33 PM   #8
Veteran Member
lammie200's Avatar

Join Date: Jun 2011
Location: San Francisco
Photos: Albums
Posts: 1,028
QuoteOriginally posted by ChooseAName Quote
The question then is, should I press on with the KatzEye focusing screen, or should I return it? I do like that the VF is brighter, but I don't know if I would have been willing to pay $160 for just a brighter VF.
You do realize that the problem you are having with the lack of AF disengagement is not related to your focusing screen, don't you?

06-29-2012, 08:52 PM   #9
Loyal Site Supporter
pacerr's Avatar

Join Date: Jan 2008
Location: Henry, TN
Photos: Gallery | Albums
Posts: 2,850
Set the lens to manual mode and slip a very thin barrier between the lens and lens mount screw to disengage the AF function if you want to play with manual focus. A small tab of thin, transparent tape (Scotch?) or aluminum foil works. Some folks recommend balancing the tab with a second tab on the opposite side of the mount to prevent any slightest tendency to act as a "tilt" lens in the mount.

The MF switch simply slides a locking tab over the AF screw spring to hold it in the disengaged position. It's a simple mechanical device and easily repaired.

This defect is an excellent excuse to acquire some of the classic ol' SMC M- and A-class, manual focus lenses.

H2

Don' need no stinkin' AF anyway.
06-30-2012, 03:48 AM   #10
Veteran Member
ChooseAName's Avatar

Join Date: Aug 2009
Location: Southeast USA
Photos: Gallery | Albums
Posts: 390
Original Poster
QuoteOriginally posted by lammie200 Quote
You do realize that the problem you are having with the lack of AF disengagement is not related to your focusing screen, don't you?
I do. But in my opinion, there's not much point in having an expensive focusing screen if one cannot disengage the AF. Turning the focusing ring means forcing the screw drive to by brute force and is not as easy as when the screw drive is disengaged.
06-30-2012, 03:50 AM   #11
Veteran Member
ChooseAName's Avatar

Join Date: Aug 2009
Location: Southeast USA
Photos: Gallery | Albums
Posts: 390
Original Poster
QuoteOriginally posted by pacerr Quote

This defect is an excellent excuse to acquire some of the classic ol' SMC M- and A-class, manual focus lenses.

H2

Don' need no stinkin' AF anyway.
I presented three options to my wife, one of which was to acquire some MF lenses (the others being return the screen because the whole reason i got it was to start manually focusing, and also just to live with it). She hasn't replied yet
06-30-2012, 07:39 AM   #12
Veteran Member
lammie200's Avatar

Join Date: Jun 2011
Location: San Francisco
Photos: Albums
Posts: 1,028
QuoteOriginally posted by ChooseAName Quote
I do. But in my opinion, there's not much point in having an expensive focusing screen if one cannot disengage the AF. Turning the focusing ring means forcing the screw drive to by brute force and is not as easy as when the screw drive is disengaged.
It is kind of a bummer, but besides the workarounds that people have described, I think you need to get your camera fixed. I do a lot of manual focusing. Personally I wouldn't give it up. It forces me to see what I am shooting, and I enjoy that. I went the cheaper option of the S-type screens from focusingscreen.com. I like them though.
07-01-2012, 11:30 AM   #13
Veteran Member
ChooseAName's Avatar

Join Date: Aug 2009
Location: Southeast USA
Photos: Gallery | Albums
Posts: 390
Original Poster
Against all odds, my wife consented to the purchase of one manual lens! I chose the 50 mm f/1.7.
07-01-2012, 09:35 PM   #14
Senior Member
pezmaker's Avatar

Join Date: Jul 2011
Location: Madison, WI
Photos: Gallery | Albums
Posts: 276
QuoteOriginally posted by ChooseAName Quote
Against all odds, my wife consented to the purchase of one manual lens! I chose the 50 mm f/1.7.
I can assure you, you'll greatly regret this decision. That is a very fine lens. It was in fact my first manual focus lens purchase, and I absolutely adore it. Still probably top 3 favorite lenses. M50 F1.7. Why will you regret it, you ask, if I enjoy it so much? because it's a gateway lens. Gateway to the bitter sweet joy and poison that is LBA, or Lens Buying Addiction. It started with that lens. Then I found the A50 F2.8 macro for a dirt cheap price. I wish I could remember the order, but I can tell you I now have 2 M50 F1.7s, the 50 macro, a sears 50 F1.4, a.... ok, I'll stop listing, there are more. not as many as some *cough RioRico cough*, but more than i'm able to use in about 4 months if I were to use one each week. Let's just say lens buying ADDICTION is right.

I'd say I hope you enjoy that 50mm (A?M?), but I know you will; so congrats on the authorization to get one, and the excellent choice on the model chosen.
07-02-2012, 09:10 PM   #15
Pentaxian
PPPPPP42's Avatar

Join Date: Jan 2012
Location: Wisconsin
Photos: Albums
Posts: 845
Actually with the crop sensor you will likely find the 50mm focal length too narrow a FOV for 75% of the things the lens was originally designed for. My A50 1.4 spends all its time on the K1000 for just that reason. An A35mm F2.8 would be a much more useable alternative and you can actually occasionally find one unlike the F2 version.

If you want something you won't get sick of for MF find yourself an A35-105 F3.5, its worth whatever you need to pay for it (usually under $200). Though with a MF zoom you either have to turn SR off or compromise in some way.
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!
af, af/mf, camera, dslr, focus, lenses, mf, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
The difference between MZ-5, MZ-7 and MZ-10? Raffwal Pentax Film SLR Discussion 7 02-11-2012 05:03 PM
Old / New 16-45 What's the Difference? seacapt Pentax SLR Lens Discussion 7 12-13-2011 01:00 PM
Seemingly the most useful camera bag ever... (Kata 3N1) sjwaldron Pentax Camera and Field Accessories 17 03-21-2011 12:19 PM
Seemingly no contrast jbander Photographic Technique 5 10-25-2010 04:53 PM
Getting seemingly soft images. ManhattanProject Pentax DSLR Discussion 14 07-05-2010 08:53 AM



All times are GMT -7. The time now is 12:26 PM. | See also: NikonForums.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