Yes. But the change in depth from one stop to the next at this point is generally not enough to cause
a viewing issue under the magnifier, at least if you have a reasonably bright light source. Sometimes it
can be too bright and you might need a ND filter somewhere in the lightpath! I work with quite a few
different enlarging lenses on several different enlargers, both in color and b&w printing, sometimes fairly large, so am functionally aware of these kinds of issues. But that doesn't mean everyone has to
be nitpicky about them. Once you're comfortable with the characteristics of a specific lens, it gets pretty
routine or second-nature to check such things in a matter of seconds.