MDM Filters for CCD Imaging

The 2.4-m and 1.3-m each have circular filter bolts capable of holding up to 8 2x2" filters.

Each telescope also has a dedicated filter bolt capable of holding 4x4-inch filters. The bolts are not exchangable between telescopes. The 1.3-m bolt can hold 12 4x4-inch filters, the 2.4-m bolt can hold 8 4x4-inch filters.

The MDM8K camera has its own filter bolt and set of filters. Details can be found on the MDM8K web page.

UBVRI - 2" x 2" and 4" x 4" (1.3-m only)

Name ID # Central Wavelength FWHM Thickness Year Curve

Bessell U 2150 364 nm 32 nm 5.0 mm 1999 y

Harris B 2151 435 nm 98 nm 5.0 mm 1999 y

Harris V 22153 538 nm 98 nm 5.0 mm 1999 y

Harris R 22152 630 nm 118 nm 5.0 mm 1999 y

Arizona I 22092 805 nm 150 nm 5.0 mm 1999 y

These 4x4-inch filters are available for use only on the 1.3-m telescope. The 2x2-inch filters date from 1999, the 4x4-inch from 2004. Both sets are made to the same prescriptions.

Gunn-Thuan - 2" x 2"

This is not an SDSS set.

Name ID # Central Wavelength FWHM Thickness Year Curve

u 12777 5.0 mm 1998? n

v 12230 395.0 nm 47.0 nm 5.0 mm 1998? y

g 11230 500.0 nm 80.0 nm 5.0 mm 1998? y

r 11231 660.0 nm 80.0 5.0 mm 1998? y

i 11232 820.0 nm 185.0 nm 5.0 mm 1998? y

Interference - 2" x 2"

Name ID # Central Wavelength FWHM Thickness Year Curve

Methane - wide 35031/9419 890 nm 30 nm 5.5 mm 1994 n

Methane - narrow 7679 893 nm 13.6 nm 5.5 mm 1995? y

H-alpha 21128 656.3 nm 10.0 nm 4.9 mm 1999 y

UBVRI - 4" x 4" (2.4-m only)

Name ID # Central Wavelength FWHM Thickness Year Curve

U 5334 4.1 mm 1994 y

B 4094353 5.0 mm 1994 y

V 1994 y

R 4094326 5.0 mm 1994 y

I 5929 4.6 mm 1994 y

HST WFPC2 - 4" x 4"

Name ID # Central Wavelength FWHM Thickness Year Curve

F450W 34913/9433 5.3 mm 1994 y

F555W 9425 5.3 mm 1994 y

F675W 914/9433 5.3 mm 1994 y

F814W 35207/9425 5.3 mm 1994 y

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