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Hi Liz
I think that the Hanimar 400mm F6.3 was part of the Hanimex brand and I suspect it would have been an M42 screw fitting, known as the “Pentax screw mount”.
I used to have a Hanimar 135mm F3.5 and it was quite soft and had noticeable chromatic aberration. I think that in their days, these were a budget range of lenses so I would not expect great performance from the lens.
Some of these older lenses do not have an automatic diaphragm (aperture) and needed to be manually stopped down, making the viewfinder dim. There may be some limitations on using these older lenses even if you were able to find a suitable adapter.
Cheers
Dennis
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