STI offers true knife-edge focusers for every major brand of 35mm and
CCD camera on the market. Yours too!
A lot of astrophotographers are unaware that the Series III
'Stiletto' is actually a true knife-edge focuser. While our regular
ronchi gratings are far easier to use, the True Knife-Edge Accessory
will convert the Series III 'Stiletto' to a premier knife-edge
focuser in seconds. Our True Knife-edge is interchangeable with the
ronchi screens we use, and requires no recalibration at all. The
changeover from one to the other takes about a minute. If you've got
the patience to learn how to use a knife edge, we have the technology!
To celebrate the holiday season, we are including a FREE True Knife
Accessory with every Series III order. You save $15 and gain
perfection at the same time. Don't delay because this offer
To learn more about the Series III and knife-edge focusing, just visit
our website and take a look at our special tutorial on how it all
Clear Skies and a Merry Christmas !