This looks like the 280mm lens head.
Don't know the exact designation for the F-mount adapter, but it should be easy to get second-hand or perhaps even new from Novoflex.
Off topic: your externally linked image would not load directly, unless I asked for it to be displayed in a new tab. No idea why.
Thank You, for Your time Birna!
Hmm weird, about loading difficulties... Might be something about eBays hosting?
Here, with Firefox, there's no problems.
As for Your answer, to the adaptor question. Does You remember if it's a M42? Or possibly Novoflex's own Bayonet?
I have never had the chance to play with a Novoflex. Or other focal lengts, larger than 200mm. (This due to budget issues. But that's a whole other story)
So aside from going fully manual, coming closer to the wildlife, has been a dream for loong time...
Also, i want to come back to the time, where it wasn't just point and shoot...