ND96 filter

[nightfisher]

Are the ND96 grey filters any good (for lunar)

thinking of getting one

[Capricorn]

If ND96 is a neutral density filter with 96% blockage thaen I would thought it was too dense.

If it is 96% transmission then it stops almost nothing, there is a 4% loss (the same) at an air to glass interface, so a piece of clear glass would reduce by the same amount.

Either way (if 96 = 96% blockage or transmission) then I cannot thing it would be of much use for lunar observing.

[nightfisher]

they have a neutral density of .06 and a transmission of 25%

[rwilkey]

The ND96 is a moon filter, the '96' is nothing to do with light transmission. The ND96 (0.9 or 0.6) Moon filter (The 0.9 and 0.6 by the way refers to the density, the higher the number, the more density. A low density for use with smaller aperture telescopes and a higher density for large apertures, suggest 0.09 for large apertures above 6" and 0.06 for small apertures below 6" - light transmission 13% and 25% respectively), the ND means Neutral Density and therefore optics do not add any false colourization, whereas some Moon filters have a colour bias (usually green).

[nightfisher]

The ND96 is a moon filter, the '96' is nothing to do with light transmission. The ND96 (0.9 or 0.6) Moon filter (The 0.9 and 0.6 by the way refers to the density, the higher the number, the more density. A low density for use with smaller aperture telescopes and a higher density for large apertures, suggest 0.09 for large apertures above 6" and 0.06 for small apertures below 6" - light transmission 13% and 25% respectively), the ND means Neutral Density and therefore optics do not add any false colourization, whereas some Moon filters have a colour bias (usually green).

Robin, thank you for that wealth of information,i fancy trying the 96-06 just to reduce glare slightly, i am not a great fan of moon filters, as you said they tend to add colour to the image, for the price i think i will go ahead with this and see if i like it

[Charon]

I have one Jules and it works well with my binoviewers.