[Pelto]

Had a lot of dust in my viewfinder - so i decided i would try to get rid of it.
Read a lot about how sensitive the focus screen should be, an d how easy it should be to destroy it.
Well i dicided i would give it a try anyway - if the worst thing should happen, it would be a good reason to buy the new K3-III when it's launched.
Long story short - I took the screen out cleaned it - reinstaled it- and it worked - no dust anymore.

Here is how i did it:

1. Press the springplate towards the front of the camera.
https://www.pentaxforums.com/forums/attachments/193-pentax-k-70-kf/525650d1613587414-focus-screen-removal-k-70-1.jpg

2. The focus screen holder with focus screen will then slide downwards.
https://www.pentaxforums.com/forums/attachments/193-pentax-k-70-kf/525651d1613587414-focus-screen-removal-k-70-2.jpg

3. Now you can gently take out the focus screen with a tweezer, be careful - only touching the small tap on the focus screen.
https://www.pentaxforums.com/forums/attachments/193-pentax-k-70-kf/525652d1613587579-focus-screen-removal-k-70-3.jpg
https://www.pentaxforums.com/forums/attachments/193-pentax-k-70-kf/525653d1613587579-focus-screen-removal-k-70-4.jpg
https://www.pentaxforums.com/forums/attachments/193-pentax-k-70-kf/525654d1613587579-focus-screen-removal-k-70-5.jpg

4.Genly cleaned it with a microfiber cleaning cloth, then a little trip with the air blower and at last i used the Pentax gel stick on the screen.
https://www.pentaxforums.com/forums/attachments/193-pentax-k-70-kf/525655d1613588231-focus-screen-removal-k-70-6.jpg
https://www.pentaxforums.com/forums/attachments/193-pentax-k-70-kf/525669d1613588231-focus-screen-removal-k-70-stick.jpg

5. When you reinstall the focus screen, be sure it is aligned with the side fences on the screen holder.
https://www.pentaxforums.com/forums/attachments/193-pentax-k-70-kf/525656d1613588231-focus-screen-removal-k-70-7.jpg

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[Dan]

Had a lot of dust in my viewfinder - so i decided i would try to get rid of it. ...

Very helpful instructions with excellent photos. Thanks for posting!

Dan

[Bad Boy]

Thanks,
I followed your tip on a used K-5 I bought here that had a speck on the screen. Good as new now!

[Pelto]

Thanks,
I followed your tip on a used K-5 I bought here that had a speck on the screen. Good as new now!

Glad it also works on the K-5

[Michael Piziak]

I think what causes a lot of dust to get on the focus screen is actually using a rocket blower to clean the sensor - resulting in dust blown up to the screen.
I have found that using the rocket blower all around the edges of the focus screen itself, often removes most of the dust on the screen - ironically.
Anyways, I would recommend that people not use a rocket blower on the sensor of their new camera - use a sticky pen.

[Pelto]

I think what causes a lot of dust to get on the focus screen is actually using a rocket blower to clean the sensor - resulting in dust blown up to the screen.
I have found that using the rocket blower all around the edges of the focus screen itself, often removes most of the dust on the screen - ironically.
Anyways, I would recommend that people not use a rocket blower on the sensor of their new camera - use a sticky pen.

Totally agree on that.

I think the rocket blower also was the one that caused the dust to settle on the upper side of my focus screen in the first place. so also a warning from me about using the rocket blower too aggressive in the housing. To much air pressure might press the dust up above the screen.