
Description
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 They have been replaced by a new Bessell design that are 5 mm thick and are similar in transmission to our 50 mm diameter Bessell set sold for the IFW.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.
Specifications
Stock No.
|
Description
|
Transmission Curve
|
Compatible Instruments
|
17030 |
Neutral Density 1%
|
no
|
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 |
no
|
all |
17041 | Johnson U |
no
|
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) | |
17149 |
Hβ narrow and wide filter set (25.4mm diameter)
|
SSP-5(R6358 & R6350 PMT) | |
17137 |
Johnson J
|
SSP-4 | |
17138 | Johnson H | SSP-4 |

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