Hi, I've recently uncovered my dad's old camera a

Unfortunately it's not possible. Along with the Olympus OM system, Nikon had very deep camera bodies so you cannot get adapters which will allow infinity focussing. As a result, very few adapters were ever made and those which exist only allow the lens to be used for close-up photography. Even when a converter is available it does not usually permit automatic lens operation nor does it allow the communication of aperture settings to the camera body.

You will have to obtain Nikon F-Mount lenses if you wish to use your FG. They don't have to be expensive: I've acquired a fair collection of both lenses and bodies in the last two years for the princely sum of zilch just by looking on my local FreeCycle/Freegle groups.

Online auction sites have plenty of them, but as long as you're not after the more unusual and higher quality lenses which attract collectors prices can be quite low. If the lenses are third party ones from the likes of Sunagor, Hoya, Bell & Howell, Miranda and a few others then they're usually perfectly good but were budget brands and usually are near worthless. Other third party brands such as Tamron, Tokina, Vivitar, Sigma were regarded as much better quality (often unjustifiably) and so command higher prices but the "bread and butter" lenses still tend to be relatively cheap.

Conversely, Canon 35mm SLR bodies were the thinnest ones around and so could accept adapters to take virtually all other 35mm SLR lenses. A few were even sophisticated enough to allow automatic operation and lens to body communication of the aperture setting but they were very scarce and expensive. I've also acquired a lot of Canon SLRs and lenses from FreeCycle/Freegle, so again there is no need to spend anything other than shipping costs and to invest in a few batteries and occasional spare parts/foam renovation kits.

I hope that my answer has not burst your bubble, instead I hope that it's given you new possibilities. All I ask in return is that you rate my answer.

For more details on mounting mismatched lenses and bodies, see the excellent CameraQuest website:-

http://www.cameraquest.com/adaptslr.htm