One key property of isometric images is that the scale doesn't vary with distance, i.e. all objects are rendered the same size regardless of distance from the camera. You can capture such images using an object-space telecentric lens. Such lenses are expensive, designed for small sensor machine vision cameras and most importantly, limited to photographing very small objects as there is no scaling with distance objects must be smaller than the sensor!

Long focal length telephotos can get close to approximating telectricity, probably close enough that the slight foreshortening will go unnoticed. Getting a 30 degree isometric view is just a case of pointing the camera at the correct angle to object.

One key property of isometric images is that the scale doesn't vary with distance, i.e. all objects are rendered the same size regardless of distance from the camera. You can capture such images using an object-space telecentric lens. Such lenses are expensive, designed for small sensor machine vision cameras and most importantly, severely limited with respect to subject distance and magnification.

Long focal length telephotos can get close to approximating telectricity, probably close enough that the slight foreshortening will go unnoticed. Getting a 30 degree isometric view is just a case of pointing the camera at the correct angle to object.