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Fast Telescope


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#1 BABFB

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Posted 16 December 2011 - 07:56 PM

I do not know anything about Imaging. So here is my first question. "What is meant by a 'Fast Scope', f/4, f/3 f/2 references?" I am thinking of getting a camera soon to start the extensive learning curve.

#2 Philip Pugh

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Posted 21 December 2011 - 10:51 PM

Anthony Glover gives an excellent description in "The science and art of using astronomical telescopes". To cut a long story short, a "fast" telescope means that it can capture light more quickly than one with a longer focal ratio.

However, the Sun is very bright, so a short exposure is needed. I use a simple compact digital camera for my solar shots. I'm experimenting more with GIMP and getting some nice results.

Since writing my books the Sun is also active in "white light", so I am getting some nice pictures by using a Baader  filter.

#3 BABFB

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Posted 01 January 2012 - 08:20 PM

Hhmm, Interesting. Way over my head but interesting. Think I get the idea there. I appreciate the info. Learn something new everyday. Have to check out your books. Thanks.




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