OPTOLONG IR-PASS FILTER 685nm Extension Variable height from 90 to

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OPTOLONG IR-PASS FILTER 685nm Extension Variable height from 90 toThe Optolong IR pass filter is designed to boost the contrast in planetary imaging as the infrared radiation is less affected by the atmospheric turbulence (seeing). All planets will appear sharper with the highest possible contrast. Mercury will reveal its faint details only with an IR pass filter. This filter is particularly useful for daytime observations as it darkens the background of the daylight. Venus can show details on its clouds, especially

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