Аннотация:The recent X-ray outburst of Be/X-ray binary pulsar Cep X-4 (Ginga 2138+56) was observed by several observatories at once (ATel#16088,#16171). The outburst started around 2023 May 26 and finished around July 9, the flux maximum was reached on June 8. The source is an X-ray pulsar with a donor B1.5Ve star and is associated with a variable star V490 Cep. We carried out spectral observations and direct imaging of this star at the decay of the X-ray outburst using the Russian 6 m telescope BTA with the multimode focal reducer SCORPIO-2.