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Digital Grin > Open each of your files to be included in this merged print. On the first file, edit>select all>copy. Now move to your new empty document, and do edit>paste. Now grab your Move Tool from the toolbox, and use it to move the pasted photo to the top of the document. Repeat the process for the second photo.
Digital Grin > Stuck? Stumped? No worries. Come on over to the Finishing School at Dgrin Forums.
Digital Grin > You now have two photos on one document. Flatten the document, and use Save As and save it to your computer. Upload to SmugMug and print it, size 20x30.
Digital Grin > Start by making a NEW 30" by 20" 300 dpi document in Photoshop.
Digital Grin > Notes: If you use zoom lenses, a lens' optical center (frequently and incorrectly referred to as the nodal point) changes for each focal setting. This means you'll need to calibrate for all frequently used settings. With my Canon 10-22, I have nodal slide settings for 10, 17, and 22mm. Oddly, the 10mm position is in between those for 17 and 22. A post-it tape chart is attached directly to the slide to look up often-used settings. These figures include the focal length, its nodal slide position, how many degrees to swing the upper rig for proper shot overlap and the number of shots I'll need for a full 360º pano if I decide that's what I want. Discuss this tutorial on Digital Grin Forums.
Digital Grin > An L-plate made for your camera model allows a convenient and accurate method of quickly locating the lens' center line whether you're mounting the camera in landscape or portrait orientation. Just line up the markings and tighten it up. Both the slide and clamp have built-in levels (see last photo) to assure an accurately centered horizon line as you pan around.
Digital Grin > Calibrating a Panoramic Head for Your Lens By Dave Watts. To eliminate the possibility of parallax errors (things not lining up properly) when stitching individual frames into panoramics, it is necessary to calibrate your panoramic head for the lenses and focal lengths you frequently use. In this example we will calibrate a Really Right Stuff MPR-CLII nodal slide for a Canon 10-22 lens at 22mm in portrait orientation for use with the RRS L-bracket, and PCL-II panning clamp atop a BH-40 ballhead. The basics described here should apply no matter what equipment you use. I should mention this tutorial is meant as a guide for single-row panoramas.
Digital Grin > Success! No parallax error here. This setting is a winner. The two targets line up exactly no matter which way we swing the rig. Write this setting down somewhere. Repeat for each lens and focal length you might use for your panoramas.
Digital Grin > ...This isn't good either. The nodal slide is too far forward and we have the opposite problem.
Open each of your files to be included in this merged print. On the first file, edit>select all>copy. Now move to your new empty document, and do edit>paste. Now grab your Move Tool from the toolbox, and use it to move the pasted photo to the top of the document.

Repeat the process for the second photo.
Digital Grin > Open each of your files to be included in this merged print. On the first file, edit>select all>copy. Now move to your new empty document, and do edit>paste. Now grab your Move Tool from the toolbox, and use it to move the pasted photo to the top of the document. Repeat the process for the second photo.
Open each of your files to be included in this merged print. On the first file, edit>select all>copy. Now move to your new empty document, and do edit>paste. Now grab your Move Tool from the toolbox, and use it to move the pasted photo to the top of the document.

Repeat the process for the second photo.
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