Anon,

Mamiya 35mm. information is very sparse, as Mamiya discontinued production of this format in the early seventies. I do have a small amount of information, but nothing referring to a 24/2.8 lens.
Probably the best site for general 35mm. information is http://herron.50megs.com/index.htm

By Anonymous on Wednesday, December 18, 2002 - 06:56 am:

Dear all,

I have got a mamiya sekor 24mm/f2.8 on used market, which I intend to be applied on my FUJICA ST801,this is a 42mm screw mount lens, but lacks of AUTO pin, means I have to manually shut down the aperture before taking the picture.

I can not find any info about it on the web, any one knows about it?

Please give comments to me, thanks!