OK, too late to edit my previous message, so here's another tidbit I found on another forum, and it works quicker than manually zooming in to see the object.

I usually have the Scene Editor window open, and if you select the newly-imported OBJ, then click somewhere in the viewport, Ctrl-F will frame the selected object, zooming in if the object is tiny. I just tried it, and it works well.

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OK . . . Where's my chocolate?

Butterfly Dezignz