#38A Dark blue 1.25" Series 4000 color filter

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Availability: More on the way

Recommended applications for this filter:
Moon - Somewhat useful for improving contrast between lunar features in scopes 8" and larger. Mercury - May improve observations of rarely visible dusky surface features at twilight, when the planet is near the horizon. Venus - Increases contrast of occasional faint dark shadings in upper Venusian clouds. Mars - Useful . . .
SKU: 372138