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not an answer, just an observation with Adobe Acrobat Pro DC—not InDesign—applying a zoom factor to a form field on the same page: It's working inasmuch that by clicking the form field the area I intended was targeted.
But the zoom factor was not exactly applied.
I had set zoom to 300% with the form field's action, but after testing with Adobe Reader the zoom went to 313%.
Not a good experience…
As I can see you are working with InDesign CS6.
There were some bugs with form fields in CS6 that were only fixed with CC v9.3.0 and CC 2014.2, I think. They were never fixed with CS6. Other bugs with form fields were introduced with InDesign CC 2015.4 and were not fixed yet with the current CC 2017.
Don't know if the bugs affect what you are trying to do here.
If I have time I will try something with my CS6 version of InDesign which is 8.1.0 on OSX 10.10.5.
Thanks so much for the response, that does at least give me some insight. I have a mind to try the PDF file on an earlier version of Acrobat Reader to see if I get the same results. If not, then, despite the inelegance of it, I may simply be reduced to manually zooming into my desired location.
Thanks again. I'll keep my eyes peeled for any insight I can gain on this as well.