New answers tagged nuschaot
There may be other practices out there, and it's confusing to learn the responses of another nusach, but Rav Moshe Feinstein's position was that anything communal and out-loud -- including the kedusha response -- should follow the kehilla's nusach.
The Kamatz-Katan version was introduced by R SZ Hanau (Shaarei Tefillah 300) by comparison with verses like Genesis 42:10. His Siddur indeed has a Makkaf. Later editions seem to have either taken the Makkaf as assumed or omitted it through ignorance. It seems the original version had the full Cholam.
Refer to DoubleAA's answer regarding the original version. It seems that originally, the usage was לשבות, and the use of the kamatz kattan with a makaf came in later. Since you questioned the general usage of the kamatz kattan by comparing it with Rashi's explanation, This site explains the general use of the kamatz katan. A Kamatz is Kamatz Katan if ...
The artscroll siddur contains yotzrot for shabbat shkalim, zachor, parah, hachodesh and hagadol
Siddur Tefilla Hashalem -- A. Greenwald
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