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Removing internal dust normally requires a full internal cleaning, lubrication and adjustment (CLA). Internal dust, if it is not a lot, will not affect picture quality at all. On many camera lenses you can stick the small tube on a can of compressed air into the back of the lens and a few moderate blasts may remove some of the internal dust. Yet this is not recommended since it is quite possible to accidentally dislodge focus cam or zoom cam grease and blow that grease onto a lens element or (worse) onto the aperture blades. So, the point is that mild to moderate amounts of internal dust won't affect your photos.
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Your old Pentax lenses uses the Pentax K mount. The current Pentax digital SLRs all use the same K mount so the lenses will fit on them. You obviously won't get all the features available on new lenses, such as autofocus, but they should all work fine.
SMCP- means: Super MultiCoated Pentax (a term that refers to the anti-relctive coatings that Pentax has been using on its lenses for years
F-means it is a lens designed to cover the larger area required of a lens for Film camera use versus the smaller sensor of the Digital SLRs Pentax also makes. Pentax also makes DA lenses , which will only work with their digital SLRs.
A- means it will work in fully automatic mode on cameras that have the ability to set shutter speed and F-stop automatically (most modern Pentaxes) It should also be noted that all DA and FA pentax lenses have a modified version of the original Pentax K lens mount, which replaced their first lens mount, the universal M42 used by so many early film SLR manufacurers- this concluded todays pentax lens history
Any Pentax K-mount lens will fit any Pentax DSLR. The DSLR will fire the shutter. There is a menu setting (RTFM) which allows the use of older lenses, but you will lose some of the automation (again RTFM). Remember to allow that the effective focal length when using a "film" lens on a DSLR body goes up by 50%.
A standard 50mm lens becomes a 75mm equivalent, but stays a large aperture.
If u used to have a Pentax camera, i would recommend you buying a Pentax DSLR, because Pentax film lenses still works on Pentax DSLR. I still use some of my prime lenses on my K10D.
Depending on which series (screwmount, K, M, etc) you have, you'll get different levels of functionality, but yes -- all Pentax lenses for 35mm and DSLR (except for the medium-format digitals) will work with your K200D. Read the manual.
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