BST 1.25" Telescope Polarizing Filter Set with 1.25" Eyepiece Holder

Our #: OFIL-BS-PFS1
Mfg #: OFIL-BS-PFS1
Our Price: $29.00
Free shipping for this item in the US
More Info

Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.

US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.

International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.

Out of Stock
Availability: Expected late April

Quick Overview

  • Variable polarizing filter improves subtle detail in Moon and bright planets
  • Cuts down on glare of bright lunar and terrestrial images
  • Transmission continuously variable from 2-40% for a wide range of viewing situations
  • Includes convenient short profile 1.25" eyepiece tube to make it easy to change eyepieces without having to remove and replace filter element

Product Details

While observing the moon or planets, there is often too much light that washes out subtle details. This glare can be cut back using neutral density filters or polarizers. Polarizers are also helpful for splitting binary stars by reducing glare and diffraction around the brighter star of a binary pair.

The variable polarizing filter makes this even better by stacking two 1.25" polarizing filters together. By rotating the two elements, light transmission can be continuously varied between about 2% and 40%. This filter retains true color balance since all wavelengths are transmitted uniformly over the entire spectrum.

This BST StarGuider polarizing filter also includes a very handy, short profile 1.25" eyepiece tube. The two filters are attached to this tube, allowing you to quickly change eyepieces without having to screw/unscrew the filters to individual eyepieces. However, the addition of this adapter requires about 1" of additional in-focus travel to compensate for its length in the optical path. Also, note that the inside depth of this tube is only 14mm (0.55") so your eyepiece will stick out by a bit if its 1.25" barrel is longer than this.

The two polarizing elements can also be unscrewed to obtain two polarizing filters (see photo 2) which can be used for day time photography or to improve contrast in images when only a little reduction in transmitted light is desired. The filters have a standard 1.25" thread (M28.5 x 0.6) so they can be screwed on to any virtually any standard 1.25" eyepiece or accessory. Or leave one filter on the assembly and screw the other one into your eyepiece, and you can vary the polarization effect by conveniently rotating the eyepiece in the holder.

Specifications:

  • Total length = 41.6mm (1.64")
  • Clear aperture = 27.0mm (1.06")
  • Weight = 1.2oz.
  • Made in China

Other Information

  • Country of Manufacture: China