I stepped into macro photography with a 50 mm f1.8 lens and a passive extension tube. Since the tube has no electrical features and lens has no on-lens aperture control, I am left with extremely shallow depth of field, annoyingly shallow even for macro shots.
Using a passive extension tube, I am trying to put the subject in focus but objects appear to be out of focus on the resulting image.
Since the definition of an object being in focus changes with respect to the distance of the observer, the observer being my eye through the viewfinder or the CMOS sensor of the camera, I am wondering if it is possible for these two observers to be experiencing two differently focused images or is it just my inexperience with the tube that ruins my images? Might there be a focus difference between these two observers that can be ignored with normal lenses but becomes significant with such shallow depth of field?
And for the record my eyes are fine, I had them checked to a doctor :)