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Old 23-06-2022, 01:39 PM
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DIY focal reducer for C11

Well, because my Meade f/0.63 FR doesn't perform as it should, I decided to make my own, just for comparison.
I had couple of binocular achromats of adequate diameter (42 mm) and FL (~180 mm), I machined the holder (black Delrin) that fits into 2" adapter barrel (in place of 2" filter).

I don't expect much of it, but still hope for clear skies next weekend...
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Old 26-06-2022, 02:04 PM
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As expected, not better than Meade (after re-assembly), but it has excellent price-performance ratio .
Could be good for visual.
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Last edited by bojan; 26-06-2022 at 08:15 PM.
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Old 27-06-2022, 03:29 PM
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Also, I will try with another lens (37 mm, ~150 mm FL, objective from theodolite), just for fun. It fits nicely and tight inside M48x0.75 filter ring.
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Last edited by bojan; 27-06-2022 at 03:49 PM.
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Old 01-07-2022, 08:09 AM
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Well done. I am surprised it works as well as it does. I suppose with a reflector the CA is not so much of a problem.

I have often wondered if I could repurpose some old 400mm lense reducers.

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As expected, not better than Meade (after re-assembly), but it has excellent price-performance ratio .
Could be good for visual.
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