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. The variable polarizing filter makes this even better by stacking two polarizing filters together and combining them with a special ring that prevents the two individual filters from getting separated during normal use. By rotating the two elements, light transmission can be varied between about 2% and 40%. This filter retains true color balance since all wavelengths are transmitted uniformly over the entire spectrum.
The two polarizing elements can be unscrewed to obtain two polarizing filters 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 filter has a standard 1.25" thread (M28.5 x 0.6) so it can be screwed on to any virtually any standard 1.25" eyepiece or accessory.
- Total item length (including external male thread) = 22.6mm (0.89")
- Clear aperture = 27mm (1.06")
- Weight = 0.5oz.
- Protective plastic storage case: Included
- Made in China
Jul 16, 2019
1.25" Variable PolarizerPros: Cons: Comments:
This is great for lunar viewing. I can vary the polarity for the best contrast and brightness for viewing specific features and areas of the moon.
I generally use half of my 2" polarizer on the front of the diagonal, and half of the 1.25" polarizer on the shorter focal length eyepieces.
This is a high quality product. The glass lenses have no apparent irregularities, and the range of polarization is fantastic for optimizing lunar viewing.
This review was provided courtesy of AgenaAstro.comAug 25, 2017
BST 1.25" Variable Transmission Polarizing FilterPros: Cons: Comments:
Much more comfortable viewing on the moon with this filter. I found it works best by attaching half to a barlow and half to an eyepiece. That way i can rotate eyepiece to vary the light transmission. Filter seems well made and does pretty much what i expected. Very satisfied with purchase.
This review was provided courtesy of AgenaAstro.comOct 11, 2015
Quality Lenses,Easy to Use,Compact,Lightweight,Accurate,Strong ConstructionCons: Comments:
Would like just a little slip-friction between the two. Once set, it is too easily moved..
This review was provided courtesy of AgenaAstro.comSort by