Here is a summary of the available TTF filters. You can download this figure from here. You can download a text file of the transmission curve by clicking on the filter links below.
Newsflash:
There
is a neat trick which allows us to "invent" a BTTF blocker centred at 450nm,
80nm width when using the MITLL3 detector. This works well at low resolution.
The B filter cuts sharply to the red, the MITLL3 cuts out in the blue as
shown here. This
was
used to good effect in Feb 2000 runs. Note that the peak transmission for
the pseudo-filter is at least 80%. What is shown here is the product of
filter and CCD.
Narrow band (3.0 inch diameter; there are many more at the WHT web site which can be used with the TTF. Note that these filters can be tilted for off-band use. Contact JBH for details. These filters provide almost full field coverage at the AAT.)
AAT HeII 4686/20Intermediate band (The R0...R8 filters used to be refereed to as the I0...I8 filters. The naming was changed to bring into line with the TTF names. The filters are 4.80 inch diameter to permit the full field to be used with the WHT TAURUS-2; a 3.5 inch filter is big enough for the AAT TAURUS-2 field.)
AAT OIII 5007/30
AAT HeI/NaD 5890/40
AAT OI 6300/40
AAT Ha/NII 6570/40
AAT SII 6730/40
AAT CI 8727/4
WHT f098 4670/320
WHT f099 4770/320
WHT f101 4880/100 (Aug 99: currently resides at AAT)
WHT f107 5000/350 (May 99: currently resides at AAT)
WHT f126 5220/380 (May 99: currently resides at AAT)
WHT f133 5700/450
WHT f135 5960/470
WHT f136 6240/540AAT B0 3750/190
AAT B1 3900/170
AAT B2 4110/150
AAT B4 5000/320
AAT B6 5820/190
AAT R0 6680/210 (this filter can be used with the BTTF or RTTF)
AAT R1 7070/260
AAT R3 7580/280
AAT R4 7820/405
AAT R5 8140/330
AAT R6 8570/400
AAT R8 9090/400
Broad
band (always use the 4" filters for full field work)
WHT users have access to a wide list of intermediate blockers: see http://ing.iac.es/~quality/filter/filter.specs/
2" diameter 4" diameter SL U KPNO B LDSS B KPNO V LDSS V KPNO R LDSS R KPNO I LDSS I