ISO 9001 - AS 9100 - ITAR Standard & Custom Optical Filters and Coatings


 

JOHNSON/BESSEL UBVRI FILTERS

Andover Corporation offers UBVRI filters as standard items. These filters are used to filter out and measure specific bands of light that 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. Contact Andover Technical Sales if you have any questions or require a quotation for a custom size or mounting.

 
 
 
 
 
 
BENEFITS 
  • Options for professionals and amateurs alike
  • Ideal for photometric calibration
  • Isolate and measure large specific bands of light emitted by astronomy objects

COMMON APPLICATIONS

  • Astronomy

 

PART NO.
DESCRIPTION
1 - 5 pcs.
6 - 10 pcs.
> 10 pcs.
Stock Status
Buy
Available Items
JOHN-U-25
Johnson U type filter/25mm dia.
$250.00
$215.00
$190.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel U Filter Filter
Bandwidth60nm nom
Minimum Transmission60%
Size25.0 +0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$250.00
6 - 10 pcs.$215.00
> 10 pcs.$190.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-U-31
Johnson U type filter/31mm dia.(un-mounted) For Astronomy Telescopes
$275.00
$237.00
$209.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel U Filter Filter
Bandwidth60nm nom
Minimum Transmission60%
Size31.0+0.00/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$275.00
6 - 10 pcs.$237.00
> 10 pcs.$209.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-U-31M
Johnson U type filter/1.25 dia. (mounted) For Astronomy Telescopes
$277.00
$238.00
$211.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel U Filter Filter
Bandwidth60nm nom
Minimum Transmission60%
Size31¯+0/-0.25mm
Thickness10 +nom/-nom mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$277.00
6 - 10 pcs.$238.00
> 10 pcs.$211.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-U-50
Johnson U type filter/50mm dia.
$629.00
$541.00
$478.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel U Filter Filter
Bandwidth60nm nom
Minimum Transmission60%
Size50.0 +0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$629.00
6 - 10 pcs.$541.00
> 10 pcs.$478.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-U-50S
Johnson U type filter/50mm x 50mm
$645.00
$555.00
$490.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel U Filter Filter
Bandwidth60nm nom
Minimum Transmission60%
Size50 X 50+0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$645.00
6 - 10 pcs.$555.00
> 10 pcs.$490.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-B-25
Johnson B type filter/25mm dia.
$250.00
$215.00
$190.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel B Filter Filter
Bandwidth100nm nom
Minimum Transmission70%
Size25.0 +0.00/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$250.00
6 - 10 pcs.$215.00
> 10 pcs.$190.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-B-31M
Johnson B type filter/1.25 dia. (mounted) For Astronomy Telescopes
$277.00
$238.00
$211.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel B Filter Filter
Bandwidth100nm nom
Minimum Transmission70%
Size31.0+0.00/-0.25mm
Thickness10 +nom/-nom mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$277.00
6 - 10 pcs.$238.00
> 10 pcs.$211.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-B-50
Johnson B type filter/50mm dia.
$629.00
$541.00
$478.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel B Filter Filter
Bandwidth100nm nom
Minimum Transmission70%
Size50.0 +0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$629.00
6 - 10 pcs.$541.00
> 10 pcs.$478.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-B-50S
Johnson B type filter/50mm x 50mm
$645.00
$555.00
$490.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel B Filter Filter
Bandwidth100nm nom
Minimum Transmission70%
Size50.0 x 50.0+0.0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$645.00
6 - 10 pcs.$555.00
> 10 pcs.$490.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-V-25
Johnson V type filter/25mm dia.
$250.00
$215.00
$190.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel V Filter Filter
Bandwidth90nm nom
Minimum Transmission85%
Size25.0 +0.00/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$250.00
6 - 10 pcs.$215.00
> 10 pcs.$190.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-V-31M
Johnson V type filter 31mm (mounted) For Astronomy Telescopes
$277.00
$238.00
$211.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel V Filter Filter
Bandwidth90nm nom
Minimum Transmission85%
Size31.0+0.00/-0.25mm
Thickness10 +nom/-nom mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$277.00
6 - 10 pcs.$238.00
> 10 pcs.$211.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-V-50
Johnson V type filter/50mm dia.
$629.00
$541.00
$478.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel V Filter Filter
Bandwidth90nm nom
Minimum Transmission85%
Size50.0 +0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$629.00
6 - 10 pcs.$541.00
> 10 pcs.$478.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-V-50S
Johnson V type filter/ 50mm x 50mm
$645.00
$555.00
$490.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel V Filter Filter
Bandwidth90nm nom
Minimum Transmission85%
Size50.0 x 50.0+0.0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$645.00
6 - 10 pcs.$555.00
> 10 pcs.$490.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-R-25
Johnson R type filer/25mm dia.
$250.00
$215.00
$190.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel R Filter Filter
Bandwidth120nm nom
Minimum Transmission85%
Size25.0 +0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$250.00
6 - 10 pcs.$215.00
> 10 pcs.$190.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-R-31
Johnson R type filter/31mm dia.(un-mounted) For Astronomy Telescopes
$275.00
$237.00
$209.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel R Filter Filter
Bandwidth120nm nom
Minimum Transmission85%
Size31.0+0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$275.00
6 - 10 pcs.$237.00
> 10 pcs.$209.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-R-31M
Johnson R type filter/1.25 dia. (mounted) For Astronomy Telescopes
$277.00
$238.00
$211.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel R Filter Filter
Bandwidth120nm nom
Minimum Transmission85%
Size31.0+0/-0.25mm
Thickness10 +nom/-nom mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$277.00
6 - 10 pcs.$238.00
> 10 pcs.$211.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-R-50
Johnson R type filter/50mm dia.
$629.00
$541.00
$478.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel R Filter Filter
Bandwidth120nm nom
Minimum Transmission85%
Size50.0 +0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$629.00
6 - 10 pcs.$541.00
> 10 pcs.$478.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-R-50S
Johnson R type filter/50mm x 50mm
$645.00
$555.00
$490.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel R Filter Filter
Bandwidth120nm nom
Minimum Transmission85%
Size50.0 x 50.0+0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$645.00
6 - 10 pcs.$555.00
> 10 pcs.$490.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-I-25
Johnson I type filter/25mm dia.
$250.00
$215.00
$190.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel I Filter Filter
Bandwidth300nm nom
Minimum Transmission85%
Size25.0 +0.00/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$250.00
6 - 10 pcs.$215.00
> 10 pcs.$190.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-I-31
Johnson I type filter/31mm dia.(un-mounted) For Astronomy Telescopes
$275.00
$237.00
$209.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel I Filter Filter
Bandwidth300nm nom
Minimum Transmission85%
Size31.0+0.00/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$275.00
6 - 10 pcs.$237.00
> 10 pcs.$209.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-I-31M
Johnson I type filter/1.25 dia. (mounted) For Astronomy Telescopes
$277.00
$238.00
$211.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel I Filter Filter
Bandwidth300nm nom
Minimum Transmission85%
Size31.0+0.00/-0.25mm
Thickness10 +nom/-nom mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$277.00
6 - 10 pcs.$238.00
> 10 pcs.$211.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-I-50
Johnson I type filter/50mm dia.
$629.00
$541.00
$478.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel I Filter Filter
Bandwidth300nm nom
Minimum Transmission85%
Size50¯+0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$629.00
6 - 10 pcs.$541.00
> 10 pcs.$478.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days
JOHN-I-50S
Johnson I type filter/50mm x 50mm
$645.00
$555.00
$490.00
In Stock
Qty To Buy:
Filter TypeJohnson/Bessel I Filter Filter
Bandwidth300nm nom
Minimum Transmission85%
Size50 X 50+0/-0.25mm
Thickness5.0 +0.1/-0.1 mm
Transmitted wavefront1/4 wave per 25mm
A/R coatingsBoth exterior surfaces
Quantity DiscountsPrice
1 - 5 pcs.$645.00
6 - 10 pcs.$555.00
> 10 pcs.$490.00
Note: Contact us at sales@andovercorp.com for large quantity discounts.

Estimated Delivery: 2-3 Days