Clear Research Grade Filter for UVBRI set, 1.25". Clear filters transmit all wavelengths from the UV to the far IR; they are clear, high-precision, optical windows designed to transmit all wavelengths of light without having to refocus when switching back to a color filter.

This is a clear infra-red blocking filter in the commonly used 1.25" size. Used when taking RGB images to remove IR for better color balance.

The Optics Cleaning Kit works well for Optics made from glass, and is suitable for use with most optical coatings including anti-reflection coatings. The Kit can be used with plastic optics also, however, a different solvent must be used.

Neutral Density (ND 2, 1.0%T) 1.25", mounted. All of our astronomical filters have IR blocking "built-in" so IR light does not contaminate today's sensitive CCD detectors. When you use filters from Custom Scientific, you do not need any additional IR blocker filters. One exception is in the thickness-matched Clear filters which transmit all wavelengths from the UV to the far IR; they are clear, high-precision, optical windows designed to transmit all wavelengths of light without having to refocus when switching back to a color filter.

All of our astronomical filters have IR blocking "built-in" so IR light does not contaminate today's sensitive CCD detectors.

Your choice: U, B, V, R, or I, 1.25" Research Grade filter, mounted. Research Grade filters have surface flatness of Lambda/4 per inch and 1 arc minute parallelism. Price is for each filter. Please specify when ordering.

Clear Standard Grade Filter for UVBRI set, 50mm. Clear filters transmit all wavelengths from the UV to the far IR; they are clear, high-precision, optical windows designed to transmit all wavelengths of light without having to refocus when switching back to a color filter.

Neutral Density (ND 2, 1.0%T) 50mm, unmounted. All of our astronomical filters have IR blocking "built-in" so IR light does not contaminate today's sensitive CCD detectors. When you use filters from Custom Scientific, you do not need any additional IR blocker filters. One exception is in the thickness-matched Clear filters which transmit all wavelengths from the UV to the far IR; they are clear, high-precision, optical windows designed to transmit all wavelengths of light without having to refocus when switching back to a color filter.

For nighttime use only. NOT for solar viewing. Hydrogen-alpha 10nm passband. This filter is designed for non-solar imaging, and is used to image deep-sky objects that emit in the h-alpha passband. It is too wide for solar-prominence viewing, but is ideal for deep sky. Filter has Anti Reflective Coatings.

Clear Research Grade Filter for UVBRI set, 50mm. Clear filters transmit all wavelengths from the UV to the far IR; they are clear, high-precision, optical windows designed to transmit all wavelengths of light without having to refocus when switching back to a color filter.

Your choice: U, B, V, R, or I, 50mm Standard Grade filter, mounted. Price is for each filter. Please specify when ordering.

Hydrogen-alpha 4.5nm passband. This filter is designed for non-solar imaging, and is used to image deep-sky objects that emit in the h-alpha passband. It is too wide for solar-prominence viewing, but is ideal for deep sky. Filter has Anti-Reflective Coatings.

Used in conjunction with the hydrogen-alpha filter for subtraction of red background. Filter has Anti Reflective Coatings.

A 4.5nm passband filter for imaging emission nebula. This filter passes the Oxygen III emission line while blocking other wavelengths. Filter has Anti Reflective Coatings.

Used in conjunction with the OIII filter for subtraction of green background. Filter has Anti Reflective Coatings.

Used for subtraction of blue background. All of our astronomical filters have IR blocking "built-in" so IR light does not contaminate today's sensitive CCD detectors. When you use filters from Custom Scientific, you do not need any additional IR blocker filters. One exception is in the thickness-matched Clear filters which transmit all wavelengths from the UV to the far IR; they are clear, high-precision, optical windows designed to transmit all wavelengths of light without having to refocus when switching back to a color filter. Filter has Anti Reflective Coatings.

A 4.5nm passband filter for imaging deep sky objects in the light of hyrogen-beta emissions. This filter passes the h-beta emission line while blocking other wavelengths. Filter has Anti Reflective Coatings.

Sulfur II 672.4/4.5nm, 1.25" with Anti Reflective Coatings.

Your choice: U, B, V, R, or I, 50mm Research Grade filter, unmounted. Research Grade filters have surface flatness of Lambda/4 per inch and 1 arc minute parallelism. Price is for each filter. Please specify when ordering.

Red, Green, Blue, and Clear filters in the most commonly used format: 1.25".