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Andover滤光片
Andover Corporation现在将UBVRI滤光片作为标准产品提供。这些滤光片用于滤除和测量天文物体发出的特定光带。
提供两种类型：Johnson / Bessel和Kron / Cousins。 Johnson / Bessell型更适合与光电倍增管一起使用，而Kron / Cousins型则更适合与硅CCD一起使用。两种过滤器套件都可以很好地工作，但是在购买任何套件之前，先确定要使用的测量系统的类型很重要。
两种滤波器类型都使用相同的U，B和V滤波器。每种类型的R＆I过滤器都不同；它们与所用检测器的响应更好地匹配。
更换滤镜时，重新对焦始终是一个问题。 Andover通过将所有过滤器研磨和抛光至非常精确的厚度来**程度地减少了此问题。
UBVRI过滤器有多种标准尺寸和定制尺寸。除安装在螺纹环中的两种尺寸外，所有其他尺寸均未安装。
Andover滤光片
| DESCRIPTION | PART NO. |
| B Filter, 100nm FWHM, 55% Transmission | KRON-B-25 |
| B Filter, 100nm FWHM, 55% Transmission | KRON-B-31M |
| B Filter, 100nm FWHM, > 55% Transmission | KRON-B-50 |
| B Filter, 100nm FWHM, > 55% Transmission | KRON-B-50M |
| B Filter, 100nm FWHM, 55% Transmission | KRON-B-50S |
| I Filter, 175nm FWHM, 70% Transmission | KRON-I-25 |
| I Filter, 175nm FWHM, 70% Transmission | KRON-I-31M |
| I Filter, 175nm FWHM, > 70% Transmission | KRON-I-50 |
| I Filter, 175nm FWHM, > 70% Transmission | KRON-I-50M |
| I Filter, 175nm FWHM, 70% Transmission | KRON-I-50S |
| R Filter, 250nm FWHM, 70% Transmission | KRON-R-25 |
| R Filter, 250nm FWHM, 70% Transmission | KRON-R-31M |
| R Filter, 250nm FWHM, 70% Transmission | KRON-R-50 |
| R Filter, 250nm FWHM, 70% Transmission | KRON-R-50M |
| R Filter, 250nm FWHM, 70% Transmission | KRON-R-50S |
| U Filter, 60nm FWHM, 50% Transmission | KRON-U-25 |
| U Filter, 60nm FWHM, 50% Transmission | KRON-U-31M |
| U Filter, 60nm FWHM, > 50% Transmission | KRON-U-50 |
| U Filter, 60nm FWHM, > 50% Transmission | KRON-U-50M |
| U Filter, 60nm FWHM, 50% Transmission | KRON-U-50S |
| V Filter, 90nm FWHM, 70% Transmission | KRON-V-25 |
| V Filter, 90nm FWHM, 70% Transmission | KRON-V-31M |
| V Filter, 90nm FWHM, 70% Transmission | KRON-V-50 |
| V Filter, 90nm FWHM, 70% Transmission | KRON-V-50M |
| V Filter, 90nm FWHM, 70% Transmission | KRON-V-50S |
