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Old 24-05-2007, 08:49 AM
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rmcpb (Rob)
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Second set of photos

Well, last night was clear at least and I had some free time. Everything was swimming in the eyepiece so the conditions left a "bit" to be desired but I plowed on regardless.

Out came the LPI and laptop, point at Luna and grab some shots of the Catharina, Cyrillus and Theophilus triplet area. Individual shots were all over the place but enough good ones were captured to have a go at stacking.

Pointing at Saturn, this time with a barlow, produced a fuzzy blob but when stacked its amazing what actually came out of these shots.

Things learnt were:
- exposure levels need to be much lower as they become overexposed with stacking
- the platform really allows tracking for imaging for quite long periods, Saturn was around the centre of the FOV for many minutes at a time with the barlow
- need a "reverse" barlow to allow the capture of the whole moon in one go
- processing takes a really long time

Considering the conditions I am very happy with the outcomes and the learning curve so far

Cheers
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Old 24-05-2007, 09:01 AM
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iceman (Mike)
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Great work Rob! They're excellent shots!

Coming along very nicely.
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Old 24-05-2007, 09:25 AM
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erick (Eric)
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Quote:
Originally Posted by rmcpb View Post

- need a "reverse" barlow to allow the capture of the whole moon in one go

excuse my ignorance but does such a beast exist?
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Old 24-05-2007, 09:30 AM
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rmcpb (Rob)
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Eric,

They exist but, for the life of me, I can't remember their proper name. They reduce the focal length of a scope and are used like a barlow and typically run at 0.63 or 0.33x magnification.

They are focal reducers!! What else would they be called

Last edited by rmcpb; 24-05-2007 at 09:57 AM.
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Old 24-05-2007, 09:48 AM
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erick (Eric)
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OK, thanks Rob. I'll be on the lookout. Perhaps someone can give me a link? Though I haven't yet got my webcam set up (adapter gone missing in post from USA ), I've been wondering how to reduce the magnification.
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Old 24-05-2007, 09:52 AM
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erick (Eric)
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Got it! I need a focal reducer
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Old 24-05-2007, 09:56 AM
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iceman (Mike)
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You mean a focal reducer? I don't know if they work on newtonians?
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Old 24-05-2007, 10:12 AM
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erick (Eric)
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Quote:
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You mean a focal reducer? I don't know if they work on newtonians?
Bintel state that "some Newtonian and refractor telescopes may have difficulty reaching focus" with to the additional in travel required.
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Old 24-05-2007, 10:34 AM
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ving (David)
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paul rini makes a focal reducer (or 0.5x barlow). you can get them on ebay and they are desinged for reflectors and refractors.
http://cgi.ebay.com.au/Rini-1-25-0-5...QQcmdZViewItem

love the moon shots tho. there are lovely and sharp!
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