Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
10-19-2013, 01:21 PM   #1
New Member

Join Date: Sep 2013
Posts: 2
Mysteryous mark on focusing screen?

I use an old Praktica MTL 5B SLR camera, and today I noticed a mark on my focusing screen. Its like a half round between the edge of the sensor and the focus circle. I used the camera yesterday and this was not there at that time. Its like some of those rounds become greyer than the others. Its on the inner side(furder from the mirror) of the screen. And it seems that only the color of a few lines turned to darker than before. I have no idea what it is. I shot a few photo of it, the quality is not the best, but i thint you shoud see what i talk about. What can cause this? What can i do with it except from taking it to a professional?
And sorry about my english.

10-21-2013, 11:55 AM   #2
Veteran Member
Nesster's Avatar

Join Date: Oct 2006
Location: NJ USA
Photos: Gallery
Posts: 13,047
That is strange, why such a thing would happen. Perhaps you just didn't note it before? At any rate, unless it really bothers you, this doesn't affect anything so I would just leave it as is.
10-21-2013, 12:58 PM   #3
Site Supporter

Join Date: Jun 2011
Location: Texas
Photos: Gallery
Posts: 1,149
Looks quite normal to me: cameras of that vintage used a fresnel lens instead of a thicker condenser lens, usually over the outer portion of the screen (you see a series of fine concentric lines in the right lighting), with plain ground-glass area inside that region around the "focusing aid" split-image or microprism. The line looks like the innermost circle of the fresnel area. You see the same thing on my 1958 Original Pentax and 1960 Nikon F, depending on the scene and lighting conditions. Sometimes you notice it, sometimes not. And sometimes attempting to clean the screen leaves a slight residue caught in the fresnel edge, making a part of it more obvious.
Don't worry about it - it just proves the camera used "advanced 1950s optical technology"!

  • 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, mark, screen
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
opinions on focusing screen littledrawe Pentax Camera and Field Accessories 6 04-19-2012 01:16 PM
Hairline crack on focusing screen Den Pentax K-5 5 04-07-2012 05:26 AM
k10d focusing screen on k-r epicownage Pentax K-r 4 11-08-2011 12:43 AM
Focusing manual lens with OEM focusing screen, is a split screen really needed? skid2964 Pentax Camera and Field Accessories 16 09-17-2010 02:54 PM
Seeking advice on focusing screen (split screen) for K200D Ari Freund Pentax DSLR Discussion 8 07-31-2009 03:00 AM

All times are GMT -7. The time now is 03:14 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]