Barlow and refocus your blocking filter?

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Valery
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Re: Barlow and refocus your blocking filter?

Post by Valery »

Ghost-Fire wrote:
Valery: Aries Safix solar blocking filters; better strehl, tighter out of band blocking?

Telescope - SAFIX - Barlow Lens - BF - camera.


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Re: Barlow and refocus your blocking filter?

Post by Merlin66 »

Not sureI understand the question or the rational...
Are you trying to say that the bandwidth of the blocking filter (nominally 10A) would be improved? Or that it could be used as a stand alone Ha filter in some way??


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Re: Barlow and refocus your blocking filter?

Post by christian viladrich »

As put forward above, the FWHM of a BF is quite large (from 6 to 10 A). The enlargement of the FWHM due the F/D ratio would be rather small, at least as long as we stay higher than say F/15.
The two images from Alexandra are for a single Fabry-Perot or a double stack Fabry-Perot. So, I am not sure if your question is about the position of the BF or the "F-P" ?


So maybe, your initial question was about the position of the F-P


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