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Old 18-08-2010, 09:56 AM
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wasyoungonce (Brendan)
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wasyoungonce is offline
 
Join Date: Jul 2006
Location: Mexico city (Melb), Australia
Posts: 2,315
Thanks gents, especially thanks for the links. It makes for good comparison.

I kinda disregarded the WO type III as it appears to only suit a few scopes. The Type IV appears to flatten well but some do not appear to reduce.

What I wanted was to flatten and give a faster FL...exposure time.

The Astrotech reducers look good as well but I read mixed reviews. The Astrotech version looks like a WO type II. I also wonder if the WO II would work?

I have looked at the Optec NGUW (.7X). It appears good but not a flattener and limited to 18mm ccds..aka for Sbig ccds.

I think DavidTrap has a TV RFL-4087 as he tested one here.

Selecting a FL reducer/flattener is more of a crystal ball operation than any absolute facts. Shee's who'd have thunk it.
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