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Optical Filters

TNG offers a wide set of wide and narrow band filters for imaging purposes that can be used both on OIG and DOLORES. Both instruments are normally equipped with the standard broad-band set, for color equations please refer to the main page of each instrument.

Special and narrow band filters are normally not mounted and not offered in queuing/service observing mode. Visiting astronomers who need using them should send an e-mail to filters staff at least 15 days before their first scheduled night specifying the chosen filter number(s) and instrument(s).

Private filters can also be accomodated in OIG or DOLORES. However, their use must be scientifically justified in the proposal and explicitely endorsed by the time allocation committee. Succesful proposers must provide their filters already mounted on a holder of diameter of 106.0 ± 0.2 mm and thickness less than 10.0 mm. For further information plase contact Adriano Ghedina.

Below please find plots and tables summarizing the main filter parameters. More information, including numerical files with efficiency values, can be obtained by clicking on the filter number in the tables.


Standard broad band filters


TNG
filter #
Name Centr. WL. (nm) FWHM (nm) Peak Tr. (%) Normally mounted on
01 U 361 60 67 DOLORES
02 B 436 103 67 OIG
03 V 533 93 84 OIG
04 R 625 128 82 OIG
09 U 371 42 54 OIG
10 B 431 102 68 DOLORES
11 V 527 98 82 DOLORES
12 R 644 148 85 DOLORES
13 I Cut-on 720 97 DOLORES
29 u' SDSS 349 68 79 DOLORES
30 g' SDSS 478 148 92 DOLORES
31 r' SDSS 620 128 94 DOLORES
32 i' SDSS 769 145 96 DOLORES
33 z' SDSS Cut-on 828 97 DOLORES
34 u' SDSS 349 68 79 OIG
35 g' SDSS 478 148 92 OIG
36 r' SDSS 620 128 94 OIG
37 i' SDSS 769 145 96 OIG
38 z' SDSS Cut-on 828 97 OIG



Special broad and intermediate band filters


TNG filter # Filter Centr. WL. (nm) FWHM (nm) Peak Tr. (%)
06 r 659 81 86
07 i_OAB 821 214 96
14 g_OAB 520 88 82
15 r_OAB 663 110 73
16 z_OAB Cut-on 850 92
27 TiO_OAR 769 31 96
28 CN_OAR 809 26 96



Narrow band filters


TNG filter # Name Centr. WL. (nm) FWHM (nm) Peak Tr. (%)
17 A7385 373.5 6.0 35.6
18 A7386 378.9 6.4 42.4
19 A7387 486.2 5.7 76.7
20 A7388 501.2 5.2 79.1
21 A7389 509.0 5.4 81.1
22 A7390 657.5 6.1 83.4
23 A7391 658.8 3.2 76.8
24 A7392 665.8 5.7 87.4
25 A7393 672.4 5.7 85.1
26 A7394 683.3 6.1 88.1



Speckle Camera filters

Please refer to the Speckle Camera page.