MACAO
- limiting magnitude for guiding: V = 17 (from ESO)
- Delta(RA,DEC) < 58"
- The reason why it takes so long to acquire a source with MACAO is that MACAO has very sensitive APD that need careful adjustment of neutral filters to not burn them. The switching in and out of numerous filter combinations takes time.
STRAP (for ATs)
- limiting magnitude for guiding: V = 13.5 (from ESO)
IRIS
- works in H/J/K, for MIDI: use IRIS in K mode (closest to N band)
- normally: use magnitude given in OB to determine IRIS DIT, but for weak sources: doesn't matter what you write into OB since integration times longer than 0.1 s (?) are not automatically used; you need to manually set IRIS to those very long integration times (e.g. 1s, 2s, ...); then: don't use ACQ for centering source but only IRIS
- limiting magnitude: K < 11
MIDI
- F.O.V. = 2 arcsec, coordinates have to be good to 1 arcsec!