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Hi AllI have been teaching myself IRAF using the official tutorials available from the IRAF Home Page. The tut's is for 2.11, and i'm using 2.12.2a. I have been able to figure out how to do things using ds9 instead of XImtool, and working with .fits instead of .imh files.I have to know and be able to work with IRAF, because i have to teach/explain the concepts to my fellow astrophysics students.The problem/error tat is currently keeping me occupied is in Exercise 4: CCD Photometry analysis. I have worked through the tut up until i have to create the "sobs" file using "mknobsfile". After editing (epar) mkobsfile and running it i get the following message:The input list of APPHOT/DAOPHOT databases (*.mag*):
The list of filter ids (60,50):
The input image set file (imsets):
The output observations file (sobs):Observations file: sobs
Warning: Image set: 1 label: M92 image: m92011
Data for filter 60 is redundant
Image set: M92 0 stars written to the observations file
Warning: Image set: 2 label: M92 image: m92014
Warning: Filter 50 does not belong to filter set ,60,0
Warning: Image set: 2 label: M92 image: m92015
Warning: Filter 50 does not belong to filter set ,60,0
Image set: 2 Label: M92 has no dataIf anyone has encountered this and may know what has gone wrong, your help would be greatly appreciated.I still have to get to PSF fitting of photometric data using DAOPHOT, but i would like to know how to use the older aperture analysis and calibrations procedure's.Thanx
Pat

Sorry all!!!!!!!!!!!!!!I missread a line and buggered-up the imsets file.
After going through the process a tenth time, I happened to notice the ERROR.I put it down to stress!!!! and end-of-week lack-of-energy.Again sorry.Regards
Blind Pat