Seems the tubes are still the best solution for my budget, an extra job for a 150mm lens is on its way as well

Cropping gives me the shivers to be honest, I can still take those pictures with a nikon FE I do have with a 105 mm, but I just like the MF a lot.

Thanks for all the tips, I've never heard about those strange lens filters so again I've learned something new over here!