Hi,
What will happen if using not a highspeed designed filter with fast speed optics such as f/2 or f/1.8, f/2.8? What could be the problem if doing that?
Fast optics with regular speed filters?
you just end up with far less transmission through the filter than it is designed for. There is a detailed explanation in this Baader document:
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I wouldn’t necessarily say “far less” transmission. It depends greatly on the filter. For instance, the standard Hutech NBZ filter claims to lose only about 5% to 8% transmission when using their standard filter with an f/2 system. Simply put, some filters require more shift than others.
But Jon’s overall statement is correct. Nothing evil will happen, but you will collect varying degrees of less data depending on the filter and the optical system.
Fyi - I do it all the time.
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yeh, probably a poor choice of words on my part but, if you decided to use a standard 3nm bandpass H-alpha filter on say a RASA, then you could be down towards 50% transmission…
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Also depends on the filter bandwidth. Seven nanometer filters are less affected but at the expense of lower contrast. Three nanometer filters have better contrast but, as Jon stated above, lose a significant amount of transmission.
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