http://www.nikonchat.com/nikon-d50-nikkor-lens/
Can i use Nikon Nikkor Q lens with my D50?
As long as it has been converted to an AI mount, you can, but of course you will have to manually focus and adjust the f/stops. With the AI kit, your 135 mm or 20cm Nikkor-Q lens should work just fine.
I have a old 105 Nikkor-P converted to AI and I can use it on both my D200, D300 and D3 …
Here is all you need to know about Nikon lenses that will work on your D50. You will see that your D50 cannot meter with the Nikkor-Q lens, so you will have to use an external meter.
http://www.kenrockwell.com/nikon/compatibility-lens.htm
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