Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-23-2011, 01:04 PM   #1
Site Supporter
mikerigel's Avatar

Join Date: Sep 2006
Location: Florida
Photos: Gallery
Posts: 311
Need help for a recently bought K100D with a custom focusing screen

I just bought a used K100d as a backup body but it came with this custom focusing screen installed, see my drawing below.



The problem is it doesn't work, when the autofocus beeps and I take the shot, the screen is all blurry, but the photos are nice and sharp.
And of course, when I manually focus to where the split screen in the middle is perfect, the photo is blurry.
So I can't manual focus at all now with this screen, pretty ironic.. isn't it what they are made for ?

I am unfamiliar with those screens, would anyone have some advice on something I can do ? Is the screen bad ? I really don't feel comfortable with changing it myself.
Thanks

06-23-2011, 01:25 PM   #2
Inactive Account




Join Date: Aug 2008
Location: Michigan, USA
Photos: Gallery | Albums
Posts: 7,484
The screen may be in upside down if it doesn't have the alignment tab on it. I had one of those cheapo Chinese screens for my K10d and what you describe is what happened the first time I put it in the camera. The bracket holding it in place may have come loose for some reason. -OR- the screen needs to be shimmed.

There are a few videos on Youtube on changing the focus screens in Pentax dslrs and in this respect all the cameras are basically the same. I'm assuming of course you have set the Diopter for your eyesight.

06-23-2011, 01:31 PM   #3
Pentaxian
Aegon's Avatar

Join Date: Jan 2008
Location: Portland, OR
Posts: 1,413
Nice drawing.

The position of the focusing screen in the light path effects its accuracy. Small changes in position cause correspondingly large changes in accuracy. Position adjustments are usually done by adding shims of the proper thickness. Determining the proper thickness may take trial and error. Common DIY shim materials include post-it notes, scotch tape, or whatever else you can find that is uniformly thick, adjustable, and likely to last for a while.

Do you know where the screen fits? Are you comfortable shimming it? =
06-23-2011, 01:32 PM   #4
Site Supporter
mikerigel's Avatar

Join Date: Sep 2006
Location: Florida
Photos: Gallery
Posts: 311
Original Poster
Thanks for your input. How can you tell if the screen is upside down ? Any markings I should look for ? I just checked the bracket holding it and it feels tight.
I did set the diopter, I wish it was the problem!

06-23-2011, 01:38 PM   #5
Site Supporter
mikerigel's Avatar

Join Date: Sep 2006
Location: Florida
Photos: Gallery
Posts: 311
Original Poster
Thanks for your help. I guess I need to look on youtube and get a feel for what needs to be done. I don't mind trying, I just need to find out where to put the shims...
So you think this is most likely the problem ? I guess it could be worst.



QuoteOriginally posted by Aegon Quote
Nice drawing.

The position of the focusing screen in the light path effects its accuracy. Small changes in position cause correspondingly large changes in accuracy. Position adjustments are usually done by adding shims of the proper thickness. Determining the proper thickness may take trial and error. Common DIY shim materials include post-it notes, scotch tape, or whatever else you can find that is uniformly thick, adjustable, and likely to last for a while.

Do you know where the screen fits? Are you comfortable shimming it? =
06-23-2011, 01:44 PM   #6
Inactive Account




Join Date: Aug 2008
Location: Michigan, USA
Photos: Gallery | Albums
Posts: 7,484
QuoteOriginally posted by mikerigel Quote
Thanks for your input. How can you tell if the screen is upside down ? Any markings I should look for ? I just checked the bracket holding it and it feels tight.
I did set the diopter, I wish it was the problem!
If there is no tab, flip the screen over. The bracket is held in place via a little clip in front of the screen housing. Pushing carefully on that tab will release the door that holds the screen in place and allow it to drop. With any of the three suggestions I gave, you will have to do this.


As I said, I believe they are all set up the same way so the actual model shouldn't matter here.

06-23-2011, 02:05 PM   #7
Site Supporter
mikerigel's Avatar

Join Date: Sep 2006
Location: Florida
Photos: Gallery
Posts: 311
Original Poster
Thanks for the link, I got the screen out, it has a tab on the right, but I still flipped it over since there's room for the tab on the left.
And it works! so thank you guys!
Now I don't have to yell at the seller!
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!
custom, focus, k100d, pentax help, screen
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Split focusing screen for K100D thoughts GibbyTheMole Pentax DSLR Discussion 8 01-15-2011 12:46 PM
Pentax K100D focusing screen question GibbyTheMole Pentax DSLR Discussion 12 12-30-2010 05:23 AM
New models coming soon. Return recently bought K-x? Muse Troubleshooting and Beginner Help 25 09-03-2010 09:18 PM
For Sale - Sold: Katzeye Focusing Screen - Pentax K200D/K100D dugrant153 Sold Items 4 08-02-2009 12:27 AM
Anyone bought in Hong Kong recently ? Mallee Boy Pentax DSLR Discussion 14 06-18-2008 09:27 PM



All times are GMT -7. The time now is 07:00 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