Astronomical Filters

Orion 1.25" Variable Polarizing Telescope Filter

The Orion Variable Polarizing Filter makes viewing the moon a more pleasurable experience. Unlike a neutral density filter that

Read story →   

Zhumell SEE IT ALL Telescope Filter Set

The Zhumell SEE IT ALL Telescope Filter Set consists of four filters, a Sky-Glow filter, a UHC (Ultra High Contrast) filter, an O-III filter, and a

Read story →   

Baader Neodymium Moon and Skyglow Filter

Like it’s name suggests, this filter also helps the view of deep-sky objects in moonlight, something that other filters

Read story →   

Zhummel See It All Filter Set

The first thing I looked at was Jupiter with my 2" 30 mm eye piece which provides 50X power. . First I looked at it with

Read story →   

Astronomik LRGB Type IIc Filters

I have been using an Astronomik H-a filter for narrowband imaging in my Meade DSI-Pro cameras for over a year. I recently added

Read story →   

Lab Test and First Light Report of 2" Zhumell Filter Set

My interest in astronomy started when I was 15 and saw Haley¡¯s comet through a pair of Bushnell binos. I had always wanted to buy a telescope but growing up in light and particulate polluted Bombay (now Mumbai), I gave up all notions of pursuing the hobby

Read story →   

Filter Performance Comparisons

The following is a summary report of visual observations of emission nebulae comparing the performance of various filters intended for such objects.

Read story →   

Orion's 2" OIII Filter

LPR, or Light Pollution Reduction filters block the most common wavelengths of the light glow we often call “light pollution”. Most of this offending light falls in the visible spectrum from 550 to 630 nanometers. LPR

Read story →   

Mars Filter Comparison

The following is taken from a post in the beginners forum based on an observing report on the morning of 09-08-05

Read story →   

Baader Planeterium Moon & Skyglow Filter

Markus just sent me a rather interesting item on the basis of, "test it, and if you like it, keep it and send me a check. If you don't like it, send it back to me." The sheet that accompanied the small box says this is a "BAADER PLANETARIUM MOON & SKYGLOW FILTER." The literature says that it is a 1.25" filter designed to thread into a standard 1.25" eyepiece and "not a simple colored filter" but a "selective contrast filter" intended to block "in the visual spectral ranges" light from sky and street lighting. It is also said to increase contrast on lunar and planetary observing but preserve "bright-dark contrast." Markus said that, unlike most color filters, this filter is optical glass, not simple colored glass, and has "flat-parallel polished surfaces."

Read story →