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Zoom (84, rev. 17)
By  Hiccup on 08-24-16, 08:27 am
Category 'Camera controllers', known, fully documented
Technically the documentation for this sprite is complete, just confusing, there is a suggestion of a visual representation of the sprites effects to make it easier to understand:
http://nsmbhd.net/thread/1566-visual-representation-of-sprites-84-and-245-suggestion/#23062

Here are the heights you get with each width:
24 width - 18 height
Data files: none
Sprite fields:
Delay: value at nybble 4-5
Zone width: value at nybble 6. 0=infinite.
Zone height: value at nybble 7. 0=infinite.
Zoom left: value at nybble 8-9. This value will match the width (in tiles) in-game. By default the game uses a width of 16 tiles, with this sprite you can use any width between 8 and 24 included. Don't forget the game always use a ratio of 4 tiles in width for 3 tiles in height, so to keep the best aspect you might want to put in this field is a value divisible by 4.
Zoom right: value at nybble 10-11. Ditto.
Zoom (84, rev. 18)
By  MarioKart7z on 09-26-16, 06:45 am
Category 'Camera controllers', known, fully documented
Technically the documentation for this sprite is complete, just confusing, there is a suggestion of a visual representation of the sprites effects to make it easier to understand:
http://nsmbhd.net/thread/1566-visual-representation-of-sprites-84-and-245-suggestion/#23062

Here are the heights you get with each width:
24 width - 18 height
Data files: none
Sprite fields:
Delay: value at nybble 4-5
Zone width: value at nybble 6. 0=infinite.
Zone height: value at nybble 7. 0=infinite.
Zoom left: value at nybble 8-9. This value will match the width (in tiles) in-game. By default the game uses a width of 16 tiles, with this sprite you can use any width between 8 and 24 included. Don't forget the game always use a ratio of 4 tiles in width for 3 tiles in height, so to keep the best aspect you might want to put in this field is a value divisible by 4.
Zoom right: value at nybble 10-11. Ditto. Setting this to a value equal to nybbles 8-9 is recommended.