What would you do with this lens?

i would try it and see if I like the result. Not much point knocking yourself out trying to sell it. It isn't worth much.

I have an air vent that blows directly onto my desk and is always moving things about. That lens would go a long way toward solving that problem. JR

I for one doubt that even severe fungus and the like does affect image by much in normal situations. We should start a shoot-out with our very worst lenses and see if any unwitting thread visitor will notice anything. Alternatively you could send the lens to Jeremy and help him improve his desk-air vent issue...

No, I'd never try to sell it. I guess I wonder 1) if it's worth trying to dismantle to attempt to remove the fungus (provided it hasn't etched the glass), 2) if I should ignore it and see how it does, or 3) send it to Jeremy for his desk use.

Hi Andy! I would try and open it up. Document and photograph every step of the way with a digicam and take notes too. It looks from the picture that the etching due to the fungus may be only in the periphery. The rest of it may come clean with mixture of house hold Ammonia and Hydrogen Peroxide 50-50 mixed just before applying it to the glass.
It may work out fine; in which case, you will have a great sense of achievement. If it does not clean up fully, you would have still learned something. Have fun if you can spare the time! I won't throw it away! Regards, sp.

Andy take a crack at it, remove the front element. From the picture I see no spanner slots, so most likely you will need some friction tool, to remove the name ring; it should be easy from there.
I have heard that applying unscented Pond cream and gently rubbing it against the affected area for a couple of days, and then wiping it clean with lens cleaning solution cleans most of the lens fungi, unless they have damaged the glass. I think you should try it.

It not pretty but its far to the edge. I don't think you will see it's effect much if at all. It's totally worth taking some pic with it at different apertures. In any case you wont lose much giving it a shot at home brew repair. I am a fan of Vivitar lenses and have four for my FD gear. Although the Vivitar Kiron-made 24mm f/2 is the more sought after, I have heard the Tokina-made 24mm f/2.8 (yours), is good performer too.

I would chuck it in the bin super quick, fungus spores can transmit and can infect other lenses too.

I would keep it and try and clean it .I did it once with a 200mm Gemini brand lens and it cleaned up nicely, the only problem was that i lost the friggin ball bearing and the aperture ring doesn't click into place when you twist it. SO i would suggest that you get a big box and cut one side off to use as your work space in case anything popes out it wont roll away from you like what happened to me. Also light is important. A cheap drafting or work lamp will help alot. Besides that, Subbarayan got some good advice with the documenting procedure.
Also let em know if you find anymore cheep 24mm lenses at f2.8. THe auction site always has them for over 50 in the Minolta MD mount. And i would love to finally get a wide angle but can only aford about 30 to 40 right now