Kalimar f=500mm 1:8 camera lens. What does it fit?

As your brother gave the lens to you why don't you just ask him these questions ?

An Update - I am truly sorry for your loss, unfortunately you said that your brother gave you the lens so obviously I had no idea he had passed away.

Most camera stores should be able to tell you what fitting the lens has and advise you accordingly.

Kalimar is an independent lens vendor that sells lenses to fit a variety of makes of camera. There may be some clue to that printed on the lens itself somewhere. As for what type of lens, it's a telephoto of rather small aperture; probably a fairly cheap one. As for what camera it fits, if it doesn't say you could take it to a camera store with a knowledgeable staff for identification.

you need to give more info,

somewhere on the lens is an identifier as the the type of mount its for.

maybe embedded in the metal at the small end you might see md,fd,om or something, or somewhere on the lens are soe numers or something,

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