This is a Nikon 200mm f4 Auto Nikkor-Q lens for sale
Price: $50 (free shipping to US)
Nikon 200mm f4 Auto Nikkor-Q
This lens, introduced in 1961, is still viable today and can be upgraded for modern AI compatitbility and Nikon DSLR & mirrorless options. I'm not a Nikon user. I own this lens because it was part of a package deal I got and I have an adapter that lets me connect it to my dedicated astro cameras. I've never connected it to a Nikon camera because I don't own a Nikon camera, so you're on your own as to whether it will work with your Nikon camera or not.
However, as an astrophotographic lens, it's top-notch! 3D print yourself a nice adapter for it to plug it into an IMX678 sensor like a ZWO ASI678MC or an ASI462 and you've got your own version of a Seestar! It's lightweight enough that you can just mount it without a shoe on an astro cam, and then mount the cam on a 1/4" bolt and call it a day.
Or figure out what you need to connect it to your Nikon. I don't know.
An incredible resource for this lens is Ken Rockwell's page where you can learn all about the lens and get links to people that can do the AI conversion if you need it. What he doesn't tell you is what it's worth. Based on my estimates, it seems like the price I have listed above is reasonable for a non-AI lens in great shape with the original box, filter, and lens hood.
Make me an offer if you disagree!
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