Solar Spectrum Optical Filters

Range of products

TEC controlled

Temperature controlled tiltable ovens

TEC controlled ovens offer the most stable way to control the filters wavelength.

This is achieved by either using a analog TEC chip controller ( requires less power) or an digital temperature controller design for controlling TEC's

Temperature controlled tiltable ovens

Tiltable ovens are good for quick Doppler tuning and general us. The temperature is controlled by a digital temperature controller

Conversions: strip heater to TEC

Temperature controlled tiltable ovens

Conversions: strip heater to TEC

To achieve better control of the filter's wavelength, standard ovens can be converted to a TEC controlled system

Spun covers to hold ERF's

Conversions: strip heater to TEC

Powder coated spun covers in a wide range of sizes, ranging from Tak60 to C-14 or larger if needed

Low cost ERF cells

Spun covers to hold ERF's

Low cost ERF cells

Cells for most common ERF's

Custom ERF cells

Spun covers to hold ERF's

Low cost ERF cells

Custom ERF cells are available from 50mm and up

Standard filters for H alpha

Research Grade

SO-1.5 series H alpha filters

ASO Grade H alpha filters

The Research Grade filters with their high uniformity will meet the requirements of the serious researcher. They are offered in a 18mm .3Ang+.1/-.05Ang

32mm or 46mm CA. These filters come in Hw of .65Ang+/-.1Ang, .5Ang+.1/-.05Ang and .3Ang+.1/-.05Ang

ASO Grade H alpha filters

SO-1.5 series H alpha filters

ASO Grade H alpha filters

The Advanced Solar Observers (ASO) are high quality bandpass filters for the advanced amateur or college level observer. They have a 32mm CA and are mounted in a precision thermoelectric controlled oven. These filters come in Hw of .5Ang+.1/-.05Ang and .3Ang+.1/-.05Ang

SO-1.5 series H alpha filters

The Solar Observer series (SO-1.5) are narrow band solar filters with the amateur solar astronomer in mind.

The SO-1.5 has a 25mm CA. These filters also come with Hw of .5Ang+.1/-.05Ang and .3Ang +.1/-.05Ang

Suna series H alpha filters

SO-1.5 series H alpha filters

The Suna series is a tiltable temperature controlled oven. They are a 25mm or 32mm CA filter. The Suna is a versatile system with a HW common with other brands of Ha filters on the market. The tilting allows quick wavelength changes for Doppler observing. They come in Hw of .65Ang+/-.1Ang,

B-1 SR controller

Suna series H alpha filters

B-1 SR controller

The B-1 SR is the standard controller for the RG and ASO ovens. It will control the oven's set point to within .1C. It operates on 12 volt DC power. It also can be used with the SO series. It provides either 12volt dc or 6.2volt dc depending on the required output voltage

B-3 controller

Suna series H alpha filters

B-1 SR controller

The B-3 controller is used with the Suna and SO-1.5 filter series. It operates on 12 volt dc.

The 120 volt version can replace the outdated controller of a standard Daystar ATM(t/a) round oven.

More options

Analog TEC controller

The Analog TEC controller is based on a custom designed TEC controler chip. It can be used with the Suna series or any TEC conversion. It is normaly used when the temperature setpoint is 30C or lower. It can be designed to operate with either a 5 volt or 12 volt dc input. It has a 4 or 6 amp 5 volt output depending on the control chip used.

K-line

Analog TEC controller

Filters in the blue end of the spectrum are less sensitive to temperature. They can be mounted either in a tiltable or TEC oven depending on the customer's needs. They are offered in 25mm, 32mm and 46mm CA. We can provide HW's from 1 Ang to less then .5Ang at this wavelength.

NA filters

Analog TEC controller

Standard thin oven

To take advantage of the Na lines, the bandpass needs to be narrow. Filters with .5Ang Hw would be the maximum. They really need to be in the .3Ang range to take full advantage of the line. With this narrow Hw the TEC controlled oven is required. They are offered in 25mm, 32mm, and 46mm CA.

Standard thin oven

Conversion: strip heater to TEC

Standard thin oven

Standard thin ovens are used for narrow, soft coated bandpass filters. These work well for optical filters where there is no external energy that will move them off band.

Conversion: strip heater to TEC

The standard strip heater's disadvantage is that the extra energy coming from the solar image will move the bandpass off band. The controller's set point only knows to turn off. With a TEC control, the controller can either heat or cool to maintain the correct temperature to hold the bandpass wavelength where you want it to be.

Collimated or telecentric

Conversion: strip heater to TEC

We can provide both collimated or telecentric designs and units for your custom needs.

We also offer standard telecentrics for most common telescopes.

Accessories

Mounting Plates

Extra long 1 1/4" and 2" front or back tubes

Front and back tubes

The mounting plates are standarized to fit all the model of filters you choose. Most plates are double threaded for more possible combinations.

Custom mounting can be made as needed.

Front and back tubes

Extra long 1 1/4" and 2" front or back tubes

Front and back tubes

These tubes are for 1 1/4" and 2" eye pieces. They come with different threads to match your mounting plate's threads.

Extra long 1 1/4" and 2" front or back tubes

These are designed to replace extension tubes that are normaly used with telecentrics.

Special tubes

Special designed ovens and controllers

Extra long 1 1/4" and 2" front or back tubes

Any custom tube that you may need

Blocker repair and upgrades

Special designed ovens and controllers

Over time filters using soft coated blockers will degrade. They can be replaced with the same design or a new design at a reasonable cost

Special designed ovens and controllers

Your needs for special sized ovens from 80mm to 12mm CA. With controllers that will interface with your system