I'm thinking of buying one of these for my Pentax K100D. maybe this is what you are looking for:-
TIMER SWITCH FOR PENTAX & CANON CAMERAS
We now have available Timer Switches to suit Canon and Pentax Cameras. The Timer Switch, with a built in interval timer, is a premium electronic remote timer for exact control over exposure time. Moreover, compared with the original products, it is affordable and is good quality. The Timer Switch allows the user to choose different functions like length, interval, delay and total number of exposures. It also has a speaker to notify the various functions. It uses an LCD background light for the display. The timer switch has been tested by one of our astro society member and he recommends it! - Thanks to Alan Brinkworth.
$55AUD
Eric - latest price is $95 - damn you GFC!
From Matthew Lovell at:-
http://www.telescopes-astronomy.com....nformation.htm