The table below presents approximate integration times (in sec) needed for
well-exposed dome flats in the JHK filters, based on empirical
measurements. The voltage setting is assumed to be -3.40. Dome flats
can be constructed by obtaining (1) a set of exposures with the
integration times listed below, (2) a set of exposures with the
integration times set to half the values given, (3) and subtracting the
two sets. Observers should always first make sure that the
count rates in any frame are below about 2000 DN/pixel.
| Plate Scale | J_MK | H_MK | K_MK | K'_MK |
|---|---|---|---|---|
| 0.3'' | 0.7 s | 1.0 s | 1.6 s | 3.0 s |