A textual apparatus is useful as a quick summary of the evidence at a particular location and also to raise questions as to unexpected manuscript combinations or readings. However, by its very nature, an apparatus presents the evidence in an atomistic way and runs the risk of fostering a view of an artefact as little more than a collection of mutually independent readings. So it is advisable to have a large number of images open on your screen – and nowadays that is not much of a problem. But then we get the small problem of understanding what is actually there. The following two examples posed considerable problems, even though there is no problem with the physical clarity of the writing.
And the rest. Give it a look.