Looks the the manual is avail at Butkus.org, after donation.

It looks like there is a metered manual mode, I highly recommend learning in that mode, anything else will automate. Keep a memo pad in your pocket and notate at a min: frame number, ISO of film, shutter speed, aperture

Have fun!

http://www.butkus.org/chinon/pentax/...pentax_sf1.htm