Hi David, › Forums › Telescopes › Can you identify this instrument? › Hi David, 20 February 2022 at 11:19 pm #585255 Rob JanuszewskiParticipant Hi David, Looks like a Zollner type photometer which would fit with Ian being a variable star observer. If I recall correctly the observer adjusts an artificial star brightness to match the star in the FOV. Rob Januszewski
