Older Pentax Lenses & Pentax digital SLR cameras

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What lens mount do you have on the lens? In other words, with what make film camera did you use the lens? A DSLR from the same company should be able to use the lens.

None directly. The T90 was the last Canon camera to use the older FD lenses. All newer Canon SLRs, film and digital, use the EF mount. However, by using an adapter such as http://www.rakuten.com/prod/adorama-canon-fd-lens-to-eos-body-adapter-with-correction-glass/216466533.html?listingId=120668308, you can use the old lenses on any Canon digital SLR.

Yes. The new digital model cameras will accept the older K-AF lenses.

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.

Newer lenses tend to be sharper and lighter than older lenses, and with better optical characteristics. Some digital-only lenses are also designed for the smaller sensors of some digital cameras, allowing for further reductions in size and weight. In general, lenses designed for film cameras will work with digital cameras.

If you already have Pentax-mount lenses, by all means continuing using them if you're satisfied with the results.

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.

not realy,,, the digital camera is tottely difrent
anyhow they would all be supper long lenses,,,

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.

I have old Lenses that I use; you must set your lens to manual, Switch left hand front of body. That should resolve the problem.