I'm looking for a decent telephoto lens for a D5300 in the range of 150 mm - 300 mm. I prefer the older Nikon lenses mostly due to the price and it would likely be a dedicated lens for astro. I've got the wide angles covered so this would just be for bigger deep sky stuff like M31, etc.
I had great success when I was shooting Canon with a 70-200 mm f4 L. Sadly, I regrettably sold it. I've recently acquired the D5300 with an 18-140 which can be nasty wide open at 140 in terms of CA and coma, which surprised me a bit although it is a 'super-zoom' lens (I'll try stopping it down as well and see). I can't afford the Nikon equivalent to the Canon, so thought some older manual lenses might fit the bill.
Any suggestions? Primes or zooms, doesn't matter. (And yes I know that primes are generally simpler in construction and have less compromises = potentially better image quality...). Does anyone use a nice old Nikon lens and enjoy it?