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09-30-2016, 01:41 PM   #1
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Dust particles in viewfinder.

It seems that there are dust particles on the top of my K-5 focusing screen. I prefer not to remove the screen in order to clean it, I am afraid of doing damage to the delicate parts. Whatever angle I use with a blower it seems that no compressed air reeches the upper side of the screen. What should I do to remove them? This dust annoys me a lot when I am framing.

09-30-2016, 02:17 PM - 1 Like   #2
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the screen is actually quite easy to remove - all you have to do is pull on the little latch tab with tweezers. The frame holding the screen will drop down, and then you can simply blow out the particles with a rocket blower. Then use the tweezers to push the frame back up into place.

This page is for replacing the screen but should give you an idea of the procedure:
--Pentax K5/K7/K10D/K20D/ISTD Focusing Screen Installation Instruction--
09-30-2016, 04:18 PM   #3
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Do not use any solvents to clean the focus screen.
09-30-2016, 09:18 PM   #4
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QuoteOriginally posted by MarkJerling Quote
Do not use any solvents to clean the focus screen.
Or a lens pen. The carbon powder will fill in the mat finish and blot out your view.

Had to purchase a new focusing screen when a family member thought they could help..

10-01-2016, 12:00 AM - 1 Like   #5
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Don't touch the screen with your bare fingers. I found it helped a lot using powder free vinyl gloves to make sure. Plan A is to use only a rocket blower but if the dust is stuck you can carefully use a very soft brush.
As dcshooter said, the instruction from focusingscreen.com should guide you through the process.
10-01-2016, 03:25 AM   #6
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Angle to blow air.

Thank you all for taking time to reply. Any suggestions where to put the nose of the blower for best results? (By the way, how can I turn on the spell checker for posting?)
10-01-2016, 10:55 AM   #7
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Taking the focusing screen out.

Plan A failed. Whatever angle I used for blowing air the particles remained. So I decided to take the screen out, plan B. I took it out and put it in four times before the results were acceptable. The difficulty was that some particles were gone but dust particles appeared in other places. I can not understand why, I kept the working desk as clean as possible, the air in the room was still, no window was open. Anyway thank you again for all the help. (I have found also the spell checker by the way).
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