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- Overview:
Telescopes - Achromatic Refractor
- Apochromatic Refractor
- Overview:
Apochromatic Refractor - ED Refractor - less color aberration than an achromatic
- SD APO - color free 2-element APO objective
- EDT APO - 3 element ED objective
- High End APO with 3-element APO objective - no color aberation
- Flatfield APO with flat field for Astrophotography
- All Apos and EDs from all manufacturers - large overview
- TS APO and ED from Japan with high quality optics
- Overview:
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- Mounts Tripods Rings Rails Power Supply ...
- Overview:
Mounts Tripods Rings Rails Power Supply ... - Mounts Equatorial with GoTo
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Telescope Accessories - Eyepieces
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- Overview:
- Filters
- Overview:
Filters - Color Filters and Color Filtersets
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- Solarfilter for H-Alpha and Calcium
- Overview:
- Adaptors
- Overview:
Adaptors - Adapter 1,25" and 24,5mm
- Adapter 2"
- Adapter T2 - M42x0.75
- Adapter M48x0,75
- Adapter M54
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- Adapter Quick Changing , Rotation
- Adapter Eyepiece Projection
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- Overview:
- Astrophotography and Photography
- Overview:
Astrophotography and Photography - Cooled Cameras
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- Overview:
Binoculars, Spotting Scopes, Microscopes, Range Finders - Roof Prism Binoculars
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Books, Software - Books for Astronomy Beginners
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- Overview:
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- New products
manufacturers
Johnson and Cousins, UBVRI, Bessell and Sloan SDSS Filters
Filters for scientific photometry with telescopes - single filters and filter sets
The filters used today for scientific photometry with digital sensors date back to the Johnson and Cousins filter sets developed in the 1950s-1970s and adapted for CCD cameras by M. Bessell in the 1990s. Today, we have better options available with dielectric filters.
The UBVRI system was developed in the 1950s for the McDonald Observatory 0.9 m telescope and consisted first of a Johnson UBV filter set, later extended by Cousins to include the R and I filters in the red part of the spectrum. The Bessell UBVRI filters are the standard today. The filters of the extended UBVRI system include: U - Ultraviolet 320-400 nm B - Blue 400-500 nm V - Visible 500-700 nm R - Red 550-800 nm I - Infrared 700-900 nm
The UBVRI system was developed in the 1950s for the McDonald Observatory 0.9 m telescope and consisted first of a Johnson UBV filter set, later extended by Cousins to include the R and I filters in the red part of the spectrum. The Bessell UBVRI filters are the standard today. The filters of the extended UBVRI system include:
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