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/ 7
2 frosted glass disks

2 frosted glass disks

American
1910-1940
2 neutral density filters

2 neutral density filters

Globe Optical Company
1900-1920
2 neutral density filters

2 neutral density filters

American
1910-1940
3 neutral density filters for telescope eyepiece

3 neutral density filters for telescope eyepiece

English
1850-1900
aperture stop with blue filter

aperture stop with blue filter

Louis Jules Duboscq
1850-1870
aperture stop with semicircular red filter

aperture stop with semicircular red filter

Louis Jules Duboscq
1850-1870
aqua-green filter

aqua-green filter

American
circa 1875
binocular tubes, eyepieces, filters for a comparator

binocular tubes, eyepieces, filters for a comparator

Ernst Leitz (company)
1951-1960
blue filter 50 mm x 50 mm

blue filter 50 mm x 50 mm

Wild Heerbrugg Ltd.
circa 1960
blue filter, diam. 33 mm

blue filter, diam. 33 mm

Wild Heerbrugg Ltd.
circa 1960
blue filters

blue filters

Corning
late 19th-mid 20th Century
box of filters

box of filters

American
1920-1940
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