It seems nowadays, manufactures never put a resolution like 640×480 or follow display resolution guide like when you buy a monitor, because they are shy to tell, just like they never mention their sensor size in compact cameras.
Resolution I mean, how many dots they can display
1280×720=921,600 dots (like Pentax Kr)
800×600=480,000 dots
320×240=230,000 dots (like my Pentax Kx)
Size I mean, like 3 inch screen or 2.7 inch screen,
Nikon Old Film lens and Nikon DSLR
Please refer to this nice guide for old nikon lens compability with nikon cameras:
A General guide is Old (since 1977) AI, AI-s, AF (current F mount) lens can mount directly with Manual Focus.
While even old (before 1977) pre-AI (non-AI, techinically ancient F mount) will Not mount.
Pentax Old Film lens and Pentax DSLR
A nice history and reference chart here
Old Pentax lens with M42 mount (before 1975) can mount with a pure metal ring adapter on Pentax DSLR.
Old Pentax lens with “K mount” (noted as “pk mount”) (after 1975) including K, M, A, F, FA, DA, DAL series can mount directly with manual focus.
A General guide is all Pentax lens can be used on Pentax cameras.
Canon Old Film lens and Canon DSLR
Old FD mount Canon lens (since 1970) will only mount with “Optical correction adapter” on Canon EOS DSLR, bad Optical correction adapter will affect the optical performance of the lens
Old Nikon, Pentax, Olympus OM, Leica R, C/Y mount, M39 mount, T mount, Rollei (35mm) Mount lens just requires a pure metal ring adapter to Canon EOS DSLR with manual focus,
Old Minolta MC,MD, Voigtlander Retina DKL lens requires “Optical correction adapter” to Canon EOS DSLR with manual focus.
Minolta Old Film lens and Sony DSLR
Old Minolta AF mount (noted as MA mount or Sony Alfa mount) lens will mount directly on Sony A DSLR with Auto Focus.
Old Minolta SR mount lens (MC, MD series) will only mount with “Optical correction adapter” on Sony A DSLR with manual focus, bad Optical correction adapter will affect the optical performance of the lens
Old other lens with M42 mount can mount with a pure metal ring adapter on Sony A DSLR with manual focus.
Sony E mount camera and Micro 4/3 camera
as Sony E mount camera and Micro 4/3 camera have even shorter lens to film distance, (while Canon has shortest among above except these 2), almost all the old manual lens can be used with a pure metal ring adapter with manual focus on them.
Range Finder Camera lens on Modern DSLR
Notes:
adapter with electronic focus confirmation will help you easily get notified when manual focusing is focused.
those optical adapters are also available without optical part, which will make the manual lens short-sighted, can focus closer but can't focus infinity.
All mounts are exchangeable with certain optical correction adapter, however, for best optical quality, only Lens with pure metal ring adapter are recommended.
Modern Auto-Focus digital lens often has no Aperture ring, thus not that exchangeable between brands; However, there are certain adapters with manual aperture control built-in, then it will has full manual function with digital lens.
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