Print in 100 % on overhead projector transparency and cut along the outer frame. Use on top of the groundglass. If a Fresnel screen is used do not put it between groundglass and screen.

The mask shows the virtual sensor (shifted) with the maximum shift of the ALPA 12 MAX and/or a minimal overlap of one mm sensor size. The theoretical overlap is indicated with dashed lines.

The mask for the 4x stitch shows a little bit less than the effective stitched area as the mask height is limited to 71 mm.