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Can the Lumicon Solar Prominence Filter be used on telescopes having focal lengths shorter than 1200mm?

April 26, 2017filter focal lengths lumicon prominence shorter solar telescopes Used

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Can the Lumicon Solar Prominence Filter be used on telescopes having focal lengths shorter than 1200mm?

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Only if a Barlow lens is used to produce an effective focal length of at least 1200mm, and only if Lumicon’s 58mm Energy Rejection Prefilter is used. The Barlow lens must be located before the delicate narrow-bandpass (1.5 ) filter. Thus, the components would occur in the following order: 1. Energy Rejection Prefilter 2. Telescope Objective 3. Barlow Lens 4. Narrow-Bandpass (1.5 ) Filter 5.