Yes, M. Delcamp uses Finale. It is the gold standard in music composition. Another way to go is Sibelius, I haven't tried it but it produces nice scores.
Re scanning, after trying the 'free solutions', I finally gave up and recently got Smartscore (Songbook Edition). It is expensive and required that I upgrade to Finale 2009 to import from xml, more money. But it means I am free to import any public domain pdf (piano, for example) and reduce it for guitar. I have also imported and transposed music from other instruments (like duets from the violin, clarinet, etc. and easy piano music, too) that I made into editions for my students.
I am still getting used to Smartscore but it is clean and simple to use. I have to break a hundred page book into about four pieces. I can take twelve separate documents (like Mozart 12 duets KV487) and scan them into one document, too. I seems to be very powerful in terms of manipulating documents.
Smartscore starts by converting the .pdf file into a .tif image file. It 'recognizes' the notation and creates an .enf file. It will then save the .enf to .xml and automatically open it in Finale where I save it to one of the Finale formats. The .xml conversion seems to work okay.
If you have a pdf you want to convert, send me a PM and we can try it out.
Kevin Collins, Amherst, Mass, USA All rights reserved.