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Set of 4 Superior Quality Yellow Red Blue Green 2" Filter for Telescopes, BNC For Sale


Set of 4 Superior Quality Yellow Red Blue Green 2



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Set of 4 Superior Quality Yellow Red Blue Green 2" Filter for Telescopes, BNC:
$20

A set of four superior quality Red, Green, Blue and Yellow 2" Filter for telescopes.

  • Wratten Number 15 Yellow (68% transmission)

Yellow filters help greatly in viewing Mars by bringing out the polar ice caps, enhancing blue clouds in the atmosphere, increasing contrast, and brightening desert regions. Yellow also enhances red and orange features on Jupiter and Saturn and darkens the blue festoons near Jupiter's equator.

  • Wratten 25 Red (14% transmission)

The 25A Red filter strongly blocks blue and green wavelengths, resulting in very sharply defined contrast between the blue-tinted cloud formations and the lighter-toned surface features on Jupiter. This filter is also quite useful for definition of the Martian polar ice caps and Maria. Try this one on Venus. Not only does it reduce the light glare, it really does some interesting things to the clouded Venusian atmosphere.

Like the light red, this filter enables observations of Mercury at twilight when the planet is near the horizon, and of Venus during daylight, reducing brightness of the blue sky to enhance surface features of the planets.

  • Wratten 58A green (24% transmission)

The 38A Dark Blue Filter is a popular choice for the study of Jupiter's disc because it strongly rejects red and orange wavelengths in the belts, thus enhancing the boundaries between the reddish belts and the adjacent bright zones. It is useful for viewing the Great Red Spot. The filter works well on Martian surface phenomena like dust storms, and is very useful during the violet clearing and for polar caps.

The dark Blue filter also increases the contrast in the rings of Saturn and in low-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 upper clouds. The #38A should only be used on telescopes of 8" of aperture or more, because of the reduced light transmission.

This filter is the best one to bring out the gas tails in comets.

  • Wratten 80A blue (30% transmission)

A Blue filter provides detail in atmospheric clouds on Mars, increases contrast on the moon, brings out detail in belts and polar features on Saturn, enhances contrast on Jupiter's bright areas and cloud boundaries. A blue filter is also useful in helping to split the binary star Antares when at maximum separation.

All of them are good for lunar observation 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.

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.

Buy from a UK PowerSeller with more than 30,000 happy customers and buy with TOTAL confidence!


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