BAADER OD 5.1 ASTROSOLAR CLEARWHITE TELESCOPE FILTER

Baader AstroSolar ClearWhite OD 5.1 Safety Film Filters are diffraction limited solar neutral density filters mounted in a temperature-compensated cell. This makes them extremely safe and protected against the normal stresses typical solar films are put under, as well as retaining the excellent optical quality at any temperature, be it -30 to +50C. No astigmatism is introduced during cold winters or hot summers.

Like the previous OD 5.0 AstroSolar film, this is the only solar film material which does not degrade the optical wavefront, thus allowing high magnification observation without reduction in sharpness or contrast. AstroSolar film produces a natural white solar image without false blue or orange colour.

The film has an optical density of OD 5.1 and reduces the intensity of sunlight by approximately 99.9992%, corresponding to a reduction factor of about 125,000. It complies with the applicable transmittance requirements of EN ISO 12312-2:2015 for filters intended for direct observation of the sun.

The AstroSolar filters are suitable for safe solar observation and photography with almost all telescopes and long telephoto lenses. They are available in a huge range of sizes to fit telescopes from 80 to 280mm in diameter. Velcro safety straps and pads and large centering bolts with rubber grips are included to secure the filter to your telescope. The bolt slots have printed index scales to allow fast and repeatable adjustment. The white outer ring rejects infrared light and features raised edges along both the inner and outer circumference to protect the film.

The film itself is repeatably cemented onto an injection moulded ring, whereas the substrate of that ring has the same thermal expansion like the Astro Solar Filter material itself. This free floating film-carrier ring is held onto the aluminium frame with the help of an additional holding ring made of fiber reinforced plastic – for maximum security against breaking of the cell.

Included are two sets of 38mm long centering bolts, three with 10mm diameter and three with 20mm diameter, along with three safety straps with glue-on pads.

WARNING: Make sure to read the included manual for important safety information before use. Testar does not take responsibility for damage caused by improper use. For more information, check out the AstroSolar website.

Specifications

How to interpret the filter size table: Astrosolar filters include two sets of rubber cylinders and have two sets of fine positioning slots, allowing you to clamp the filters over a large range. The cylinders can be positioned to clamp on the outside of your telescope tube (distance range in RED above) or on the inside of the tube with opposing force (in GREEN).

Downloads

Instruction manual