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Large ACHROMAT for RGB imaging?
I saw an article in a recent SAN reviewing 5" ACHROs and it got me thinking -the costs are not to high considering the appature so:
How about a large ACHRO teamed with a mono CCD and filters instead of the costly ED/APO glass? Are any ACHROs really suitable for AP or would you not get the build quality/focuser etc needed in that format?
Anybody doing this?
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