How do I remove the focusing screen from a pentax mg camera

Remove the lens and clean the contacts on the camera body and the lens where they meet with a cotton swab lightly dampened with rubbing alcohol. Re-attach the lens and make sure the ring (if you have one) is set to "A".

Your camera has the option for manual focus. This option allows you to focus the camera to capture what you want, rather than the auto-focus feature.

This will be indicated by a MF in the top center of your camera screen. You should be able to change this by finding record mode and changing your AF settings. Change your MF to the [ ] option and you should be on auto-focus settings.

Hope this helps.

Chadlnrd

The best way to lighten the viewfinder is to purchase a new focusing screen. There are many alternatives available and usually cost around $100. There are specialty screens to allow better manual focusing and others that brighten the viewfinder. These effects are usually achieved through coatings on the screen. They are relatively simple to install, however if you are uncomfortable doing it yourself, a local camera shop should be able to do it in a matter of minutes.
This screen will allow better focusing of manual lenses and will also brighten the viewfinder, when you purchase the "Brightness enhancement treatment" option at the bottom of the page. http://www.katzeyeoptics.com/item--Pentax-K100D-K110D-K200D-K-r-K-x-Focusing-Screen--prod_K100D.html
The linked product also fits your camera, and the brand is highly regarded as being good quality. There are other options available though, simply search on B&H Photo Video or Adorama Camera. They have many different options.
B&H:http://www.bhphotovideo.com/c/search?Ntt=k100d+focusing+screen&N=0&InitialSearch=yes Adorama:http://www.adorama.com/SearchSite/Default.aspx?searchinfo=focusing+screen&category=4294962858
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Some pentax digitals(most) will accept k mount lenses. Ricoh differed from the Pentax standard in one slight -- but important -- way. They used a locking pin (called the "Ricoh pin") that just happens to fall at exactly the same place as the auto-focus socket on Pentax auto-focus cameras. (That include Pentax film and digital SLRs with auto focus.) If you put your Ricoh lens on the AF Pentax, you may find that the Ricoh pin will get stuck in the AF hole and you can't get them back apart. The fix is simple, if you are even a little bit handy and have a jewellers' screwdriver. You can remove the pin from the Ricoh lens, and then safely use it on your Pentax cameras. The lack of a pin doesn't seem to adversely affect either the lens or the camera.

For more details, see here:

http://forums.dpreview.com/forums/read.asp?forum=1036&message=19214685

Unfortunately, it is not possible to mount Minolta lenses on a Pentax K mount camera and retain either auto-focus, metering, or the ability to focus at infinity.
The reason for the loss of the ability to focus at infinity is because the distance from the mount to where the image forms on a Minolat lens is 43mm, whereas on a Pentax it is 46mm, so the Minolta lens glass would need to be 2mm into the body of the Pentax camera in order for the image to form on the sensor (i.e. have a clear image that is in focus).
The only solution to this is to purchase an adapter with an optical element such as this: http://photo-adapter-llc.amazonwebstore.com/Zykkor-Minolta-MD-Lens-to-Pentax/M/B004PB8142.htm?traffic_src=froogle&utm_medium=CSE&utm_source=froogle This will allow you to focus at infinity, however you will have to use stop down metering and manual focus, as the electrical contacts will not connect. Also, you can expect a slight loss of image quality when using an adapter.
I personally have a few Minolta lenses that I have wanted to use on my Pentax, so I understand your pain. It is a shame they don't work better.
Thank you for using FixYa!

Try this first.

Set your lens focus to infinity and focus your screen at a far away object (like a distant lampost). If it,s not in focus, then you have a misaligned mirror. Adjust your mirror so that a infinity setting, the split-screen image merge well to form a well focussed image. Hope that helps.

Sounds like the pressure plate for the viewfinder lens has dropped in front of the lens. If the viewfinder surround is craked this is very likley.

To learn how to remove the top of these cameras and other Pentax's there is a camera repair website where you are shown how to do this. Just click the link.

Make sure you have not set a dial control to say manual focus or Macro focus. Run through the menu's on the screen to see if you have inadvertantly changed sometihg. As you are computing - give Pentax Technical Support Team a a go on their website

That camera has a removable focusing screen. Usually the object(hair) is sitting on top of the focusing screen so the screen has to be dropped down to remove it. There is a clip(frame) accessable from the mirror box that needs to be un-hooked. The frame swings down and usually the screen and a brass shim(s) comes down with it. If your careful and don't actually remove the frame, screen and shim it's pretty straight forward to gently blow the hair out. After removing the hair, gently swing the frame up and clip it back in.If the frame, screen and shim actually fall out it's tricky getting them back in correctly. The screen is also very soft and scratches easily so much care is needed. If you're uncomfortable trying to attempt this then take the MZ50 to a good repair shop. We do this service free and usually while you wait. Other shops may charge you a fee to do it. If the hair is behind the eyepiece then the top cover has to be removed to get the hair out. That is a totally different problem and the camera will need to be repaired. Since the hair dosen't affect the image on the film, you may just want to live with it or have it removed when something else needs to be done when the camera has to be disassembled anyway. Hope this helps.

Pentax make three different screens for the D and DS. Go check their homesite, or do a search here. None of the Pentax oriinal screens has microprismes or split image. They are engraved in different ways.