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When you observe the moon, the bright moon will irritate your eyes and cause eye diseases. It can alleviate this pain and damage to you by the moon.
SV139 1.25" Neutral Density ND filter reduces glare so you can see more lunar detail and surface features with your telescope
Performance optics glass:
SV139 ND0.9 filter is coated on both sides, reduction of scattering light. SV139 ND0.9 filters are made of HD optics glass that have good level of transmittance.
26mm is the clear aperture diameter.
Jessica Goodway
2025-08-28 20:37:16
This thing does what it is supposed to. Makes viewing a full moon much more bearable under higher magnification. The build is solid and comes in a little plastic clamshell case that can be kept as its home. This is the first moon filter I've ever used so I can't compare it to more expensive models. Honestly, I'm not sure what a higher end filter could do to best it. For only $11 I'd say just get this one. You're only going to use it on a full moon anyway.
peter dzintars
2025-08-02 13:57:53
Great filter and works as described, however the filter threads do not catch and tighten with my Celestron 8-24mm zoom eye piece ( I used a small piece of tape to hold it into place), attaches and tightens normally with my Celestron 25mm PLOSSL, not a deal breaker and still recommend for the price.
Sarandi
2025-07-26 12:19:05
The ND properties of this filter are nice especially for the cost. Glass has good clarity. I like that it's gray rather than the typical green or even blue. Good finish, but unfortunately doesn't fit most of my standard 1.25 inch eyepieces so I'm docking a star. Not a big deal for me because I'm ordering more SVBony lenses so hopefully those work better together. But as is, a little disappointed. Easy enough to tape, but you shouldn't have to do that. Not exactly sure what the problem is here, maybe a disconnect between metric and imperial but as I stated earlier these should be a very standard fit.
levan
2025-07-12 13:22:02
its fine
Michael Roberts
2025-06-22 11:54:14
Does the job with no wierdness. The filter screws to the eyepiece smoothly and the machine work is of high qaulity.
Scruffy
2025-05-06 18:32:37
The moons still bright but it definitely dims it down. Screws on super easily. Good purchase
maggie
2025-02-10 21:03:07
A little darker than most moon filters,but that is the good thing....five stars
david
2025-01-27 17:35:27
Need some light reduction when helping my grandson to view the moon, even on a Cresent with slight magnification the moon is bright. This filter blocks enough light to protect your eyes.
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