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Sorry, no. If it fit onto a Pentax camera then the lens has a Pentax mount. The Nikon (I assume you mean the D80 digital camera, or perhaps the N80 film camera) has a Nikon mount. Since the Nikon mount has a deeper flange distance than the Pentax mount, there are no adapters available to allow you to fit a Pentax-mount lens onto a Nikon camera.
Hi, There is a tiny mirror to reflect the f stops to the view finder. Either this tiny mirror fell off or the needs adjustment. You have to take out the top cover to have the access to this tiny mirror.
It doesn't need batteries to shoot. You can use it on manual without batteries, but the exposure meter won't work (if you know what you're doing you can go by). But the stuck mirror should be fixed. It could be just plain dirty/rusty/bent etc. The advance lever might be gone since it won't 'click'. A professional shop can fix it, but the one you tried doesn't sound very professional...
it could be the rubber bumper next to the fresnel lens has become sticky. very gently ( after removing lens ) try to bring mirror down without forcing it. it should release easily.
if not, rotate the select knob off auto. open film door and check that the shutter is fully deployed, shutters should not be overlapping.
remove screws from bottom cover and remove cover, keep camera up side down so that re-wind button stays put. there is a locking lever under the take up spool ( gray ) . with a pin move lever toward film door and bring advance lever fully to the right , then let it go so it returns quickly.
the shutter should have fired. if not the camera will need to be repaired. get an estimate first as there are no new parts available.
Don't even think about cleaning the mirror in your SLR. For smudges and marks that can't be blown away with a handheld blower, you really need to have it cleaned by a repair shop. Most technicians clean mirrors with a special viscous fluid specially formulated to protect the fragile surface of the mirrors. Definitely do not attempt it with a standard lens cleaning solution or cloth as you could cause irreparable damage.
Keep in mind that this will not require disassembly of the camera, so the charge should be nominal
The mirror box control mechanism needs servicing ( rubber parts have perished and are gumming up the workings of the mirror mechanism so shutter is not workingrking) . Unfortunatelly this requires complete strip down and so should be done professionally.