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Old 11-11-2011, 01:01 PM
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Joshua Bunn (Joshua)
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2'' diagonal with imaging

Hi All,

With the issue of camera clearence through the fork when imaging near the celestial pole, has anyone tried using a diagonal mirror after a feathertouch focuser (eg, moonlight or starlight) then the imaging camera into the diagonal. If so what sort of results does it produce?

I have a LX200 ACF 12" and am in the process of deciding on a moonlight or starlight instruments feathertouch focuser. Im using the meade 2'' 99% reflectivity diagonal purchased about 6 months ago.

Also, starlight instruments offer a short adapter to go from the 3.27" rear cell to the feathertouch focuser, is there a disadvantage with this shorter option over the longer option? Im thinking about in terms of achieving focus and clearing the fork base.
here is the link to the short adapter (http://starlightinstruments.com/shop...8e89350fb52901 http://www.iceinspace.com.au/forum/d...9Af0J5EwgAOw== http://www.iceinspace.com.au/forum/d...9Af0J5EwgAOw== http://www.iceinspace.com.au/forum/d...9Af0J5EwgAOw== ) and its respective feathertouch focuser (FTF 2008BCR 2") and here is the link for the longer adapter (http://starlightinstruments.com/shop...8e89350fb52901 http://www.iceinspace.com.au/forum/d...9Af0J5EwgAOw== http://www.iceinspace.com.au/forum/d...9Af0J5EwgAOw== http://www.iceinspace.com.au/forum/d...9Af0J5EwgAOw== ) and its respective focuser (FTF 2015BCR 2'').

Comment welcome.

thanks
Josh
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  #2  
Old 12-11-2011, 06:43 AM
Poita (Peter)
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I've used a diagonal, the main issue was achieving focus and getting it square, it can work okay, but is an additional point where movement can creep in.
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Old 12-11-2011, 12:15 PM
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Joshua Bunn (Joshua)
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Thanks Peter, what seemed to be the problem with achieving focus?
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Old 12-11-2011, 01:18 PM
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Marke (Mark)
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It will use up a lot of back focus probably as much as 2" .
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