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#1
October 4th 04, 02:02 PM
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Focal Reducer for a Refractor?
How do I reduce the focal length on an ST80 refractor? I have seen
references to modified /reduced focal lengths for refractors on the captions of some astrophotos. I use a reducer on my SCT. Is there a refractor equivalent? Thanks 
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#2
October 4th 04, 07:19 PM
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"RS" wrote in message news  How do I reduce the focal length on an ST80 refractor? I have seen references to modified /reduced focal lengths for refractors on the captions of some astrophotos. I use a reducer on my SCT. Is there a refractor equivalent? This _might_ work: http://www.scopestuff.com/ss_tafp.htm But, you will need enough inward focuser travel.
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#3
October 5th 04, 04:52 AM
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This _might_ work: http://www.scopestuff.com/ss_tafp.htm But, you will need enough inward focuser travel. Is there any way of determining if you have enough inward travel? Mine has 6" of travel and is a 900mm FL scope.
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#4
October 7th 04, 07:39 AM
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focal reducers are avaiable for the better refractors but expensive. You
can make your own... but the issue of in-travel usually means you will not getthe reduction you hopes for... RS wrote: How do I reduce the focal length on an ST80 refractor? I have seen references to modified /reduced focal lengths for refractors on the captions of some astrophotos. I use a reducer on my SCT. Is there a refractor equivalent? Thanks
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