Kron/Cousins UBVRI Filters

Andover Corporation is now offering UBVRI filters as standard items. These filters are used to filter out and measure specific bands of light which are emitted by astronomical objects. 

Two types are offered: the Johnson/Bessel and the Kron/Cousins. The Johnson/Bessell type is better suited for use with a photomultiplier tube whereas the Kron/Cousins type is better suited for use with a Silicon CCD. Both filter sets work very well but it is important to establish the type of measuring system you are going to utilize before purchasing any sets.

Both filter types utilize the same U, B & V filters. The R & I filters for each type are different; they are better matched to the response of the detector being used.

Refocusing is always a problem when changing filters. Andover has minimized this problem by grinding and polishing all filters to very precisely controlled thicknesses.

The UBVRI filters are available in a range of standard and custom sizes. With the exception of two sizes which are mounted in threaded rings, all other sizes are unmounted. Contact Andover Technical Sales if you have any questions or require a quotation for a custom size or mounting.

DESCRIPTION PART NO. 1-5 pcs. >5 pcs. QTY IN STOCK QTY
+ B Filter, 100nm FWHM, 55% Transmission KRON-B-25 $204 $163 7
Filter Type Kron/Cousins B Filter Filter
Bandwidth 100nm nom
Minimum Transmission 55%
Size 25.0 +0.00/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $204
6+ $163
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ B Filter, 100nm FWHM, 55% Transmission KRON-B-31M $302 $242 0
Filter Type Kron/Cousins B Filter Filter
Bandwidth 100nm nom
Minimum Transmission 55%
Size 31.0 +0.00/-0.25mm
Mounting None
Thickness 10 +nom/-nom mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $302
6+ $242
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ B Filter, 100nm FWHM, > 55% Transmission KRON-B-50 $631 $505 1
Filter Type Kron/Cousins B Filter Filter
Bandwidth 100nm nom
Minimum Transmission > 55%
Size 50.0 +0.0/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $631
6+ $505
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ B Filter, 100nm FWHM, > 55% Transmission KRON-B-50M $664 $531 0
Filter Type Kron/Cousins B Filter Filter
Bandwidth 100nm nom
Minimum Transmission > 55%
Size 50.0 +0.0/-0.25mm
Mounting Threaded ring
Thickness 10 +nom/-nom mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $664
6+ $531
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ B Filter, 100nm FWHM, 55% Transmission KRON-B-50S $631 $505 0
Filter Type Kron/Cousins B Filter Filter
Bandwidth 100nm nom
Minimum Transmission 55%
Size 50.0 x 50.0 +0.0/-0.25mm
Mounting None
Thickness 5.0 +0.10/-0.10 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $631
6+ $505
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ I Filter, 175nm FWHM, 70% Transmission KRON-I-25 $204 $163 3
Filter Type Kron/Cousins I Filter Filter
Bandwidth 175nm nom
Minimum Transmission 70%
Size 25.0 +0.00/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $204
6+ $163
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ I Filter, 175nm FWHM, 70% Transmission KRON-I-31M $302 $242 0
Filter Type Kron/Cousins I Filter Filter
Bandwidth 175nm nom
Minimum Transmission 70%
Size 31.0 +0.00/-0.25mm
Mounting None
Thickness 10 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $302
6+ $242
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ I Filter, 175nm FWHM, > 70% Transmission KRON-I-50 $631 $505 1
Filter Type Kron/Cousins I Filter Filter
Bandwidth 175nm nom
Minimum Transmission > 70%
Size 50.0 +0.0/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $631
6+ $505
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ I Filter, 175nm FWHM, > 70% Transmission KRON-I-50M $664 $531 0
Filter Type Kron/Cousins I Filter Filter
Bandwidth 175nm nom
Minimum Transmission > 70%
Size 50.0 +0/-0.25mm
Mounting Threaded ring
Thickness 10 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $664
6+ $531
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ I Filter, 175nm FWHM, 70% Transmission KRON-I-50S $631 $505 2
Filter Type Kron/Cousins I Filter Filter
Bandwidth 175nm nom
Minimum Transmission 70%
Size 50.0 x 50.0 +0.0/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $631
6+ $505
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ R Filter, 250nm FWHM, 70% Transmission KRON-R-25 $204 $163 7
Filter Type Kron/Cousins R Filter Filter
Bandwidth 250nm nom
Minimum Transmission 70%
Size 25.0 +0.00/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $204
6+ $163
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ R Filter, 250nm FWHM, 70% Transmission KRON-R-31M $302 $242 0
Filter Type Kron/Cousins R Filter Filter
Bandwidth 250nm nom
Minimum Transmission 70%
Size 31.0 +0.00/-0.25mm
Mounting None
Thickness 10 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $302
6+ $242
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ R Filter, 250nm FWHM, 70% Transmission KRON-R-50 $631 $505 5
Filter Type Kron/Cousins R Filter Filter
Bandwidth 250nm nom
Minimum Transmission 70%
Size 50.0 +0.0/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $631
6+ $505
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ R Filter, 250nm FWHM, 70% Transmission KRON-R-50M $664 $531 0
Filter Type Kron/Cousins R Filter Filter
Bandwidth 250nm nom
Minimum Transmission 70%
Size 50.0 +0.0/-0.25mm
Mounting Threaded ring
Thickness 10 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $664
6+ $531
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ R Filter, 250nm FWHM, 70% Transmission KRON-R-50S $631 $505 0
Filter Type Kron/Cousins R Filter Filter
Bandwidth 250nm nom
Minimum Transmission 70%
Size 50.0 x 50.0 +0.0/-0.25mm
Mounting None
Thickness 5.0 +0.10/-0.10 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $631
6+ $505
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ U Filter, 60nm FWHM, 50% Transmission KRON-U-25 $204 $163 12
Filter Type Kron/Cousins U Filter Filter
Bandwidth 60nm nom
Minimum Transmission 50%
Size 25.0 +0.00/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $204
6+ $163
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ U Filter, 60nm FWHM, 50% Transmission KRON-U-31M $302 $242 0
Filter Type Kron/Cousins U Filter Filter
Bandwidth 60nm nom
Minimum Transmission 50%
Size 31.0 +0.00/-0.25mm
Mounting None
Thickness 10 +nom/-nom mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $302
6+ $242
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ U Filter, 60nm FWHM, > 50% Transmission KRON-U-50 $631 $505 5
Filter Type Kron/Cousins U Filter Filter
Bandwidth 60nm nom
Minimum Transmission > 50%
Size 50.0 +0.00/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $631
6+ $505
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ U Filter, 60nm FWHM, > 50% Transmission KRON-U-50M $664 $531 0
Filter Type Kron/Cousins U Filter Filter
Bandwidth 60nm nom
Minimum Transmission > 50%
Size 50.0 +0.00/-0.25mm
Mounting Threaded ring
Thickness 10 +nom/-nom mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $664
6+ $531
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ U Filter, 60nm FWHM, 50% Transmission KRON-U-50S $631 $505 0
Filter Type Kron/Cousins U Filter Filter
Bandwidth 60nm nom
Minimum Transmission 50%
Size 50.0 x 50.0 +0.0/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $631
6+ $505
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ V Filter, 90nm FWHM, 70% Transmission KRON-V-25 $204 $163 15
Filter Type Kron/Cousins V Filter Filter
Bandwidth 90nm nom
Minimum Transmission 70%
Size 25.0 +0.00/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $204
6+ $163
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ V Filter, 90nm FWHM, 70% Transmission KRON-V-31M $302 $242 0
Filter Type Kron/Cousins V Filter Filter
Bandwidth 90nm nom
Minimum Transmission 70%
Size 31.0 +0.00/-0.25mm
Mounting None
Thickness 10 +nom/-nom mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $302
6+ $242
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ V Filter, 90nm FWHM, 70% Transmission KRON-V-50 $631 $505 13
Filter Type Kron/Cousins V Filter Filter
Bandwidth 90nm nom
Minimum Transmission 70%
Size 50.0 +0.0/-0.25mm
Mounting None
Thickness 5.0 +0.1/-0.1 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $631
6+ $505
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ V Filter, 90nm FWHM, 70% Transmission KRON-V-50M $664 $531 0
Filter Type Kron/Cousins V Filter Filter
Bandwidth 90nm nom
Minimum Transmission 70%
Size 50.0 +0.0/-0.25mm
Mounting Threaded ring
Thickness 10 +nom/-nom mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $664
6+ $531
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ V Filter, 90nm FWHM, 70% Transmission KRON-V-50S $631 $505 3
Filter Type Kron/Cousins V Filter Filter
Bandwidth 90nm nom
Minimum Transmission 70%
Size 50.0 x 50.0 +0.0/-0.25mm
Mounting None
Thickness 5.0 +0.10/-0.10 mm
Transmitted wavefront 1/4 wave per 25mm
A/R coatings Both exterior surfaces
QtyPrice
1-5 $631
6+ $505
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.