Some pictures of the collimator mirrors with old coatings:

Some pictures of the collimator mirrors with new coatings:

Many pictures by Joonas Viuho and Viktoria Pinter:
Taking the mirrors out
Putting recoated mirrors back in

Three pictures by Acton Teledyne after stripping the old coatings:

From reflectivity measurements by Neil O'Mahony (ING),
before and after total reflectivity (A*A*F*B:)

	total R%	total R%
wavelength	before	after	gain
365	28.8	47.8	1.66
404	36.4	86.9	2.39
464	41.8	89.8	2.15
522	48.5	88.3	1.82
624	49.3	84.4	1.71
760	45.7	85.4	1.87
970	55.7	88.2	1.58

Here A and B are the collimators, and F the flat mirror. Mirror A (left in above pictures with both mirrors) is a double-pass mirror.