Optec Home > Astronomy > Catalog > SSP Photometers> SSP Filters

SSP Filters For Photometry

Optec offers a wide selection of filters for astronomical photometry in standard color systems. These filters are designed for the SSP series of single-channel stellar photometers and are 12.5mm (") in diameter and 7.00 mm thick. The filter sets offered are the Johnson U B V R I J H  wide-band standard color set, Strömgren u v b y  medium-band four-color set and the H wide and narrow band  filter set. To learn more about the Strömgren and H filters click here to download (1.8MB) and read a tutorial. Each of these filters can be factory mounted directly into the 2 and 6-position (automatic) filter sliders for the SSP photometers. See below for the transmission characteristics and instrument compatibility.

For routine photometry, consider a B - V set mounted in a two position slider.  Consult texts on astronomical photometry for more information on the use of these special filters.

The Johnson filters that were available from Optec in 1-inch diameter size have been discontinued. Some may still be listed on the Scratch and Dent page. They have been replaced by a new Bessell design that are 5 mm thick and are similar in transmission to our 50 mm diameter Bessell set sold for the IFW.  Click here for more information.

Filters for SSP Photometers
Stock No.
Transmission Curve
Compatible Instruments
 Neutral   Density 1%
 SSP-5(R6358 & R6350  PMT)
17031   Johnson U   SSP-3, SSP-5(R6358 PMT)
17032   Johnson B  SSP-3, SSP-5(R6358 & R6350 PMT)
17033   Johnson V  SSP-3, SSP-5(R6358 PMT)
17034   Johnson R  SSP-3, SSP-5(R6358 PMT)
17035   Johnson I  SSP-3
17036   Clear, BK-7
17041   Johnson U
 SSP-5(R6350 PMT)
17043   Johnson V  SSP-5(R6350 PMT)
17045   Strömgren u   SSP-5(R6358 & R6350 PMT)
17046   Strömgren v   SSP-5(R6358 & R6350 PMT)
17047   Strömgren b   SSP-5(R6358 & R6350 PMT)
17048   Strömgren y  SSP-5(R6358 & R6350 PMT)
  H narrow and wide
 SSP-5(R6358 & R6350 PMT)
  Johnson J
17138   Johnson H  SSP-4