Color filters can be very useful for enhancing your views of the Moon and the planets. Depending on the atmospheric conditions, the telescope being used, the observer's experience, and the planet being observed or photographed, the advantages of color filters can be anywhere from subtle to dramatic. The right filter can make all the difference between seeing several small craters in the floor of Clavius on the Moon or not; seeing five or six swirls in Jupiter's belts or not; or seeing the inner Crepe Ring of Saturn or not.
Agena's 2" color/planetary filters are manufactured from the purest optical glass and are dyed-in-the-mass (not simply "color coated") for premium performance. They thread into the barrels of virtually any 2" telescope eyepiece. Each filter cell has a male and female 2" filter thread (M48x0.75) on opposite sides, so multiple filters can be stacked to achieve selective filtration of the visual color spectrum. The clear aperture is 43mm and each filter comes in a protective plastic storage case.
The #8 Light Yellow Filter enhances detail of red and orange-colored phenomena in the belts of Jupiter. It increases contrast of the blue-colored Maria on Mars by reducing scattered light from these areas, while allowing passage of more green light thus highlighting yellow dust clouds as well. It provides improved resolution of detail on Uranus and Neptune in large telescopes (over 10"). The light yellow filter is popularly used to enhance lunar features, particularly in small telescopes (below 8"). In comets, it brings out highlights in yellowish dust tails and enhances the coma.
Oct 30, 2016
Poor Man's Minus V FilterPros:
Accurate,Quality Lenses,Easy to UseCons:
Some light leakage in UV and infraredComments:
I use this 2" #8 filter for a poor man's Minus V Achromat filter. For visual it works very well. For photography it has light leakage at the UV and infrared range. However, I can still use it for color photography recognizing that some brighter stars will have purple and red haze around them. Still it works well for visual and is a lot cheaper than a Minus V filter.
This review was provided courtesy of AgenaAstro.comJan 30, 2016
Good Minus V filterPros:
Quality Lenses,Easy to Use,Strong ConstructionCons: Comments:
After doing quite a bit of reading I decided to try the #8 filter as a Minus V filter. I have a 1 1/4" Minus V filter that works well but needed something that I could leave on my 2" diagonal. So I purchased the 2"Agena #8 filter. It almost totally eliminates the chromatic aberration but changes some of the color of objects. The sky is yellow tinted and some objects are tinted yellow. However, if you can live with the color change, this is the best deal going on a low cost Minus V filter!
This review was provided courtesy of AgenaAstro.comJun 27, 2015
Nice filter for reducing CA in achromat refractors.Pros:
Quality Lenses,Easy to UseCons: Comments:
This low-cost filter does a great job of reducing chromatic aberration (CA) or false color in my f6.5 achromat refractor. CA is still visible on bright objects like Jupiter but it is noticeably reduced. The moon looks great and I do not notice any yellow tinge from the filter. It also sharpens up views of DSOs like open and globular clusters. This would be a good addition for any fast achromat refractor. I usually leave the filter attached to the diagonal.
This review was provided courtesy of AgenaAstro.comSort by