Set of 4 Superior Quality Yellow Red Blue Green 2" Filter for Telescopes, BNC For Sale
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Set of 4 Superior Quality Yellow Red Blue Green 2" Filter for Telescopes, BNC:
$25.34
A set of four superior quality Red, Green, Blue and Yellow 2" Filter for telescopes.
- Wratten Number 15 Yellow (68% transmission)
Yellowfilters help greatly in viewing Mars by bringing out the polar ice caps,enhancing blue clouds in the atmosphere, increasing contrast, and brighteningdesert regions. Yellow also enhances red and orange features on Jupiter andSaturn and darkens the blue festoons near Jupiter's equator.
- Wratten 25 Red (14% transmission)
The 25ARed filter strongly blocks blue and green wavelengths, resulting in verysharply defined contrast between the blue-tinted cloud formations and thelighter-toned surface features on Jupiter. This filter is also quite useful fordefinition of the Martian polar ice caps and Maria. Try this one on Venus. Not only does it reduce thelight glare, it really does some interesting things to the clouded Venusianatmosphere.
Like thelight red, this filter enables observations of Mercury at twilight when theplanet is near the horizon, and of Venus during daylight, reducing brightnessof the blue sky to enhance surface features of the planets.
- Wratten 58A green (24% transmission)
The 38ADark Blue Filter is a popular choice for the study of Jupiter's disc because itstrongly rejects red and orange wavelengths in the belts, thus enhancing theboundaries between the reddish belts and the adjacent bright zones. It isuseful for viewing the Great Red Spot. The filter works well on Martian surfacephenomena like dust storms, and is very useful during the violet clearing andfor polar caps.
The darkBlue filter also increases the contrast in the rings of Saturn and inlow-contrast features between the zones. This is a good one to use on Venus,the low transmission increasing the contrast of dark shadings in the upperclouds. The #38A should only be used on telescopes of 8" of aperture ormore, because of the reduced light transmission.
Thisfilter is the best one to bring out the gas tails in comets.
- Wratten 80A blue (30% transmission)
A Bluefilter provides detail in atmospheric clouds on Mars, increases contrast on themoon, brings out detail in belts and polar features on Saturn, enhancescontrast on Jupiter's bright areas and cloud boundaries. A blue filter is alsouseful in helping to split the binary star Antares when at maximum separation.
All of them are good for lunarobservation too.
The filter will fit all standard sized 2" eyepieces and accessories such as Barlow lens etc. It is mounted in a nicely anodized Al alloy housing and is threaded on both sides for stacking with other 2” filters if necessary
I have a personal Quality Promise on this item.If you are not happy with it for whatever reason, just return the item to me by normal post, I will refund you in full including P&P you have paid.Buy with a peace of mind.
Delivery:
The lens will be posted to you the same day by Royal MailFirst Class Post whenyour payment is received before 13:00 O'clock. Otherwise, it will be posted the next day. Please note that all payment received over the weekend will be posted the following Monday. International Buyers pleasesee postage details.
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