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VISUAL IMAGE 60 MM FILTER / 15 BLOCKER ON SCHMIDT 2000 MM OFF AXIS FOCAL REDUCER


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#1 DREAMTRUCK

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Posted 31 December 2009 - 05:29 PM

greetings all - i am using a 900 mm refractor  with good visual image but want a 1200 mm visual system  - thought of using my 8" schmidt cas. 2000 with focal reducer BUT i expect the image will not come out of 15 blocking filter - ANY IDEAS using a 2000 mm schmidt ?? i expect the 1200 created by the reducer will not give me an image at the eye piece - any one used a 2000 schmidt with the coronado filters ??

thanks howard

#2 Philip Pugh

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Posted 16 January 2010 - 04:45 PM

I've never heard of it being used. I would have thought it hard to get a large area of the solar disc with a focal length of 1200mm. Most Barlow lenses work well with Coronado filters and using the SCT won't give you better resolution as it is the 60mm aperture filter that is the limiting factor. Barlow lens quality isn't a big consideration, as chromatic aberration isn't relevant for narrowband filtering.




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